Results for "L. L. Kelly"

total 95842took 0.19s
Berglund-Hübsch-Krawitz Mirrors via Shioda MapsApr 11 2013We give an elementary approach to proving the birationality of multiple Berglund-H\"ubsch-Krawitz (BHK) mirrors by using Shioda maps. We do this by creating a birational picture of the BHK correspondence in general. Although a similar result has been ... More
Application of Bayesian probability theory to the measurement of binomial data at past and future Tevatron experimentsAug 10 1999The experimental problem of converting a measured binomial quantity, the fraction of events in a sample that pass a cut, into a physical binomial quantity, the fraction of events originating from a signal source, is described as a system of linear equations. ... More
Fractional Calabi-Yau Categories from Landau-Ginzburg ModelsOct 16 2016We give criteria for the existence of a Serre functor on the derived category of a gauged Landau-Ginzburg model and describe it explicitly. This is used to provide a general theorem on the existence of an admissible (fractional) Calabi-Yau subcategory ... More
Proof of a Conjecture of Batyrev and NillDec 03 2014Oct 16 2016We prove equivalences of derived categories for the various mirrors in the Batyrev-Borisov construction. In particular, we obtain a positive answer to a conjecture of Batyrev and Nill. The proof involves passing to an associated category of singularities ... More
Fractional Calabi-Yau Categories from Landau-Ginzburg ModelsOct 16 2016Jun 22 2017We give criteria for the existence of a Serre functor on the derived category of a gauged Landau-Ginzburg model. This is used to provide a general theorem on the existence of an admissible (fractional) Calabi-Yau subcategory of a gauged Landau-Ginzburg ... More
Derived Categories of BHK MirrorsFeb 18 2016We prove a derived analogue to the results of Borisov, Clarke, Kelly, and Shoemaker on the birationality of Berglund-Hubsch-Krawitz mirrors. Heavily bootstrapping off work of Seidel and Sheridan, we obtain Homological Mirror Symmetry for Berglund-Hubsch-Krawitz ... More
Relationship between blocking temperature and strength of interparticle interaction in magnetic nanoparticle systemsOct 28 2015In magnetic nanoparticle systems, the variation of the blocking temperature $T_B$ with the measuring frequency $f_m$ is often used to determine the strength of the interparticle interactions (IPI) through a parameter $\Phi$ or the Vogel-Fulcher temperature ... More
Direct Limits of Adèle Rings and Their CompletionsDec 21 2017Jun 13 2018If $\mathbb A_K$ and $\mathbb A_L$ are ad\`ele rings of global fields $K \subseteq L$, then $\mathbb A_K$ may be identified with a topological subring of $\mathbb A_L$ via the injection $\mathrm{con}_{L/K}:\mathbb A_K \to \mathbb A_L$. For a fixed global ... More
Core-Collapse Supernovae and Host Galaxy Stellar PopulationsOct 06 2011Oct 19 2012We have used images and spectra of the Sloan Digital Sky Survey to examine the host galaxies of 519 nearby supernovae. The colors at the sites of the explosions, as well as chemical abundances, and specific star formation rates of the host galaxies provide ... More
Baryon magnetic moments in the background field methodSep 21 2005We present a calculation of the magnetic moments for the baryon octet and decuplet using the background-field method and standard Wilson gauge and fermion actions in the quenched approximation of lattice QCD. Progressively smaller static magnetic fields ... More
An Empirical Fitting Method for Type Ia Supernova Light Curves. II. Estimating the First-Light Time and Rise TimeDec 08 2016We investigate a new empirical fitting method for the optical light curves of Type Ia supernovae (SNe~Ia) that is able to estimate the first-light time of SNe~Ia, even when they are not discovered extremely early. With an improved ability to estimate ... More
Theory of ac-Stark splitting in core-resonant Auger decay under strong x-ray fieldsNov 07 2011In this work we report the modification of the normal Auger line shape under the action of an intense x-ray radiation. Under strong Rabi-type coupling of the core, the Auger line profile develops into a doublet structure with an energy separation mainly ... More
Equivalences of Families of Stacky Toric Calabi-Yau HypersurfacesMar 17 2015Mar 08 2018Given the same anti-canonical linear system on two distinct toric varieties, we provide a derived equivalence between partial crepant resolutions of the corresponding stacky hypersurfaces. The applications include: a derived unification of toric mirror ... More
Towards a relation extraction framework for cyber-security conceptsApr 16 2015In order to assist security analysts in obtaining information pertaining to their network, such as novel vulnerabilities, exploits, or patches, information retrieval methods tailored to the security domain are needed. As labeled text data is scarce and ... More
A core-shell-surface layer model to explain the size dependence of effective magnetic anisotropy in magnetic nanoparticlesJul 23 2017The particle size (D) dependence of the effective magnetic anisotropy Keff of magnetic nanoparticles (NPs) usually shows Keff increasing with decreasing D. This dependence is often interpreted using the Eq.: Keff = Kb + (6Ks/D) where Kb and Ks are the ... More
Mirror Quintics, discrete symmetries and Shioda MapsSep 10 2008In a recent paper, Doran, Greene and Judes considered one parameter families of quintic threefolds with finite symmetry groups. A surprising result was that each of these six families has the same Picard Fuchs equation associated to the holomorphic 3-form. ... More
The Host Galaxies of Fast-Ejecta Core-Collapse SupernovaeJan 03 2014Jun 09 2014Spectra of broad-lined Type Ic supernovae (SN Ic-BL), the only kind of SN observed at the locations of long-duration gamma-ray bursts (LGRBs), exhibit wide features indicative of high ejecta velocities (~0.1c). We study the host galaxies of a sample of ... More
Baryon magnetic moments in the external field methodOct 25 2004We present a calculation of the magnetic moments of the baryon octet and decuplet using the external field method and standard Wilson gauge and fermion actions in the quenched approximation. Progressively smaller static magnetic fields are introduced ... More
Long Gamma-Ray Bursts and Type Ic Core Collapse Supernovae Have Similar Locations in HostsDec 04 2007Nov 10 2008When the afterglow fades at the site of a long-duration gamma-ray burst (LGRB), Type Ic supernovae (SN Ic) are the only type of core collapse supernova observed. Recent work found that a sample of LGRB in high-redshift galaxies had different environments ... More
Equivalences of Families of Stacky Toric Calabi-Yau HypersurfacesMar 17 2015Given the same anti-canonical linear system on two distinct toric varieties, we provide a derived equivalence between partial crepant resolutions of the corresponding stacky hypersurfaces. The applications include: a derived unification of toric mirror ... More
Synthesis, structure and magnetic properties of Fe@Pt core-shell nanoparticlesFeb 03 2015Structural and magnetic properties of Fe@Pt core-shell nanostructure prepared by a sequential reduction process are reported. Transmission electron microscopy (TEM) shows nearly spherical particles fitting a lognormal size distribution with $D$$_o$= 3.0 ... More
Does the Charm Flow at RHIC?Dec 16 2002Recent PHENIX Au+Au -> e- + X data from open charm decay are shown to be consistent with two extreme opposite dynamical scenarios of ultra-relativistic nuclear reactions. Perturbative QCD without final state interactions was previously shown to be consistent ... More
Ring theoretic properties of quantum grassmanniansAug 21 2002The m x n quantum grassmannian, G_q(m,n), is the subalgebra of the algebra of m x n quantum matrices that is generated by the maximal m x m quantum minors. Several properties of G_q(m,n) are established. In particular, a basis of G_q(m,n) is obtained, ... More
Magnetic relaxation and correlating effective magnetic moment with particle size distribution in maghemite nanoparticlesJan 26 2015Feb 03 2015The role of particle size distribution inherently present in magnetic nanoparticles (NPs) is examined in considerable detail in relation to the measured magnetic properties of oleic acid-coated maghemite ({\gamma}-Fe$_2$O$_3$) NPs. Transmission electron ... More
Hubble Residuals of Nearby Type Ia Supernovae Are Correlated with Host Galaxy MassesDec 04 2009May 11 2010From Sloan Digital Sky Survey u'g'r'i'z' imaging, we estimate the stellar masses of the host galaxies of 70 low redshift SN Ia (0.015 < z < 0.08) from the hosts' absolute luminosities and mass-to-light ratios. These nearby SN were discovered largely by ... More
Meson Decay Constants from Isospin Mass Splittings in the Quark ModelJul 11 1992Decay constants of $D$ and $B$ mesons are estimated within the framework of a heavy-quark approach using measured isospin mass splittings in the $D$, $D^*$, and $B$ states to isolate the electromagnetic hyperfine interaction between quarks. The values ... More
Distances with <4% Precision from Type Ia Supernovae in Young Star-Forming EnvironmentsOct 03 2014Mar 26 2015The luminosities of Type Ia supernovae (SNe), the thermonuclear explosions of white-dwarf stars, vary systematically with their intrinsic color and the rate at which they fade. From images taken with the Galaxy Evolution Explorer (GALEX), we identified ... More
The mixed-valent manganese [3 x 3] grid [Mn(III)4Mn(II)5(2poap-2H)6](ClO4)10.10H2O, a mesoscopic spin-1/2 clusterJun 15 2006The magnetic susceptibility, and low-temperature magnetization curve, of the [3 x 3] grid [Mn(III)4Mn(II)5(2poap-2H)6](ClO4)10.10H2O is analyzed within a spin Hamiltonian approach. The Hilbert space is huge (4,860,000 states), but the consequent use of ... More
Feline coronaviruses associated with feline infectious peritonitis have modifications to spike protein activation sites at two discrete positionsDec 12 2014Feline infectious peritonitis (FIP) is associated with mutations in the feline coronavirus (FCoV) genome that are thought to convert the subclinical feline enteric coronavirus (FECV) into the lethal feline infectious peritonitis virus (FIPV). A key feature ... More
Infrared Luminosity Function of the Coma ClusterDec 02 2005Using mid-IR and optical data, we deduce the total infrared (IR) luminosities of galaxies in the Coma cluster and present their infrared luminosity function (LF). The shape of the overall Coma IR LF does not show significant differences from the IR LFs ... More
Impact of densitized lapse slicings on evolutions of a wobbling black holeJul 03 2003We present long-term stable and second-order convergent evolutions of an excised wobbling black hole. Our results clearly demonstrate that the use of a densitized lapse function extends the lifetime of simulations dramatically. We also show the improvement ... More
Submillimeter Variability and the Gamma-ray Connection in Fermi BlazarsJan 06 2010We present multi-epoch observations from the Submillimeter Array (SMA) for a sample of 171 bright blazars, 43 of which were detected by Fermi during the first three months of observations. We explore the correlation between their gamma-ray properties ... More
A Novel Test for Host-Symbiont Codivergence Indicates Ancient Origin of Fungal Endophytes in GrassesNov 25 2006Aug 28 2008Significant phylogenetic codivergence between plant or animal hosts ($H$) and their symbionts or parasites ($P$) indicate the importance of their interactions on evolutionary time scales. However, valid and realistic methods to test for codivergence are ... More
Simulating the Performance of Large-Format Submillimetre Focal-Plane ArraysSep 19 2001Sep 24 2001A robust measurement of the clustering amplitude of the sub-mm population of starburst galaxies requires large-area surveys (>> 1 deg^2). The largest-format arrays subtend only 10 arcmin^2 on the sky and hence scan-mapping is a necessary observing mode. ... More
Zeta functions of alternate mirror Calabi-Yau familiesDec 29 2016Feb 14 2018We prove that if two Calabi-Yau invertible pencils have the same dual weights, then they share a common factor in their zeta functions. By using Dwork cohomology, we demonstrate that this common factor is related to a hypergeometric Picard--Fuchs differential ... More
Evidence that Gamma-ray Burst 130702A Exploded in a Dwarf Satellite of a Massive GalaxyJul 19 2013Nov 04 2013GRB 130702A is a nearby long-duration gamma-ray burst (LGRB) discovered by the Fermi satellite whose associated afterglow was detected by the Palomar Transient Factory. Subsequent photometric and spectroscopic monitoring has identified a coincident broad-lined ... More
Large, Extra Dimensions at the Deep Underground Neutrino ExperimentFeb 29 2016We investigate the potential of the long-baseline Deep Underground Neutrino Experiment (DUNE) to study large-extra-dimension (LED) models originally proposed to explain the smallness of neutrino masses by postulating that right-handed neutrinos, unlike ... More
Automatic Labeling for Entity Extraction in Cyber SecurityAug 22 2013Jun 09 2014Timely analysis of cyber-security information necessitates automated information extraction from unstructured text. While state-of-the-art extraction methods produce extremely accurate results, they require ample training data, which is generally unavailable ... More
Investigating the Near-Infrared Properties of Planetary Nebulae. I. Narrowband ImagesAug 03 1995We present the results of a near-infrared narrowband imaging survey of planetary nebulae. Objects were selected in a way that complements similar surveys done at visible and near-infrared wavelengths. No new detections of molecular hydrogen emission were ... More
Improved Moving Puncture Gauge Conditions for Compact Binary EvolutionsApr 25 2014Oct 06 2014Robust gauge conditions are critically important to the stability and accuracy of numerical relativity (NR) simulations involving compact objects. Most of the NR community use the highly robust---though decade-old---moving-puncture (MP) gauge conditions ... More
Black hole head-on collisions and gravitational waves with fixed mesh-refinement and dynamic singularity excisionMar 16 2005Jun 20 2005We present long-term-stable and convergent evolutions of head-on black hole collisions and extraction of gravitational waves generated during the merger and subsequent ring-down. The new ingredients in this work are the use of fixed mesh-refinement and ... More
On the Change in Archivability of Websites Over TimeJul 30 2013As web technologies evolve, web archivists work to keep up so that our digital history is preserved. Recent advances in web technologies have introduced client-side executed scripts that load data without a referential identifier or that require user ... More
Understanding caustic crossings in giant arcs: characteristic scales, event rates, and constraints on compact dark matterSep 30 2017Jan 09 2018The recent discovery of fast transient events near critical curves of massive galaxy clusters, which are interpreted as highly magnified individual stars in giant arcs due to caustic crossing, opens up the possibility of using such microlensing events ... More
Hypergeometric decomposition of symmetric K3 quartic pencilsOct 15 2018We study the hypergeometric functions associated to five one-parameter deformations of Delsarte K3 quartic hypersurfaces in projective space. We compute all of their Picard--Fuchs differential equations; we count points using Gauss sums and rewrite this ... More
Astro2020 Decadal Science White Paper: The state of gravitational-wave astrophysics in 2020Mar 11 2019While still in its infancy, the budding field of gravitational-wave astronomy has so far exceeded most expectations, and the achievements that have already been made bode well for the decade to come. While the discoveries made possible by LIGO have captured ... More
PlanetSense: A Real-time Streaming and Spatio-temporal Analytics Platform for Gathering Geo-spatial Intelligence from Open Source DataJul 19 2015Geospatial intelligence has traditionally relied on the use of archived and unvarying data for planning and exploration purposes. In consequence, the tools and methods that are architected to provide insight and generate projections only rely on such ... More
Spikes Synchronization in Neural Networks with Synaptic PlasticityMay 07 2015In this paper, we investigated the neural spikes synchronisation in a neural network with synaptic plasticity and external perturbation. In the simulations the neural dynamics is described by the Hodgkin Huxley model considering chemical synapses (excitatory) ... More
Adsorption induced pyramidal distortion of the tri-metallic nitride core inside the endohedral fullerene Sc$_3$N@C$_{80}$ on the Ag(111) surfaceMar 13 2019Our ability to understand and tailor metal-organic interfaces is mandatory to functionalize organic complexes for next generation electronic and spintronic devices. For magnetic data storage applications, metal-carrying organic molecules, so called single ... More
Effect of a Dissipative Term in the Drift Waves Hamiltonian SystemMay 07 2015This paper analyses the Hamiltonian model of drift waves which describes the chaotic transport of particles in the plasma confinement. With one drift wave the system is integrable and it presents stable orbits. When one wave is added the system may or ... More
Suppression of neuronal phase synchronisation in cat cerebral cortexJan 26 2016We have studied effects of perturbations on the cat cerebral cortex. According to the literature, this cortex structure can be described by a clustered network. This way, we construct a clustered network with the same number of areas as in the cat matrix, ... More
The low level of debris disk activity at the time of the Late Heavy Bombardment: a Spitzer study of PraesepeMar 24 2009We present 24 micron photometry of the intermediate-age open cluster Praesepe. We assemble a catalog of 193 probable cluster members that are detected in optical databases, the Two Micron All Sky Survey (2MASS), and at 24 micron, within an area of ~ 2.47 ... More
Mathematical Model with Autoregressive Process for Electrocardiogram SignalsMar 21 2017Nov 06 2017The cardiovascular system is composed of the heart, blood and blood vessels. Regarding the heart, cardiac conditions are determined by the electrocardiogram, that is a noninvasive medical procedure. In this work, we propose autoregressive process in a ... More
Nonlinear cancer chemotherapy: modelling the Norton-Simon hypothesisOct 12 2018Oct 15 2018A fundamental model of tumor growth in the presence of cytotoxic chemotherapeutic agents is formulated. The model allows to study the role of the Norton-Simon hypothesis in the context of dose-dense chemotherapy. Dose-dense protocols aim at reducing the ... More
Resonance Patterns of an Antidot Cluster: From Classical to Quantum BallisticsJun 30 1997We explain the experimentally observed Aharonov-Bohm (AB) resonance patterns of an antidot cluster by means of quantum and classical simulations and Feynman path integral theory. We demonstrate that the observed behavior of the AB period signals the crossover ... More
The dose-dense principle in chemotherapyMar 16 2017Jun 23 2017Chemotherapy is a class of cancer treatment that uses drugs to kill cancer cells. A typical chemotherapeutic protocol consists of several drugs delivered in cycles of three weeks. We present mathematical analyses demonstrating the existence of a maximum ... More
Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light CurvesJan 29 2009Jun 14 2009We combine the CfA3 supernova Type Ia (SN Ia) sample with samples from the literature to calculate improved constraints on the dark energy equation of state parameter, w. The CfA3 sample is added to the Union set of Kowalski et al. (2008) to form the ... More
Photoinduced 3D orientational order in side chain liquid crystalline azopolymersMar 22 2003We apply experimental technique based on the combination of methods dealing with principal refractive indices and absorption coefficients to study the photoinduced 3D orientational order in the films of liquid crystalline (LC) azopolymers. The technique ... More
RetinaMatch: Efficient Template Matching of Retina Images for TeleophthalmologyNov 28 2018Retinal template matching and registration is an important challenge in teleophthalmology with low-cost imaging devices. However, the images from such devices generally have a small field of view (FOV) and image quality degradations, making matching difficult. ... More
Observational signatures of microlensing in gravitational waves at LIGO/Virgo frequenciesMar 11 2019Microlenses with typical stellar masses (a few ${\rm M}_{\odot}$) have traditionally been disregarded as potential sources of gravitational lensing effects at LIGO/Virgo frequencies, since the time delays are often much smaller than the inverse of the ... More
Measured Metallicities at the Sites of Nearby Broad-Lined Type Ic Supernovae and Implications for the SN-GRB ConnectionJan 09 2007Dec 19 2007We compare the chemical abundances at the sites of 12 nearby (z <0.14) Type Ic supernovae (SN Ic) that showed broad lines, but had no observed Gamma-Ray Burst (GRB), with the chemical abundances in 5 nearby (z < 0.25) galaxies at the sites of GRB where ... More
Spike timing-dependent plasticity induces non-trivial topology in the brainJan 08 2016Feb 08 2017We study the capacity of Hodgkin-Huxley neuron in a network to change temporarily or permanently their connections and behavior, the so called spike timing-dependent plasticity (STDP), as a function of their synchronous behavior. We consider STDP of excitatory ... More
Estimating the First-Light Time of the Type Ia Supernova 2014J in M82Jan 30 2014Feb 10 2014The Type Ia supernova (SN Ia) 2014J in M82 (d~3.5 Mpc) was serendipitously discovered by S. Fossey's group on 2014 Jan. 21 UT and has been confirmed to be the nearest known SN Ia since at least SN 1986G. Although SN 2014J was not discovered until ~7 days ... More
Twins for life? A comparative analysis of the Type Ia supernovae 2011fe and 2011byAug 12 2014The nearby Type Ia supernovae (SNe Ia) 2011fe and 2011by had nearly identical photospheric phase optical spectra, light-curve widths, and photometric colours, but at peak brightness SN 2011by reached a fainter absolute magnitude in all optical bands and ... More
Weighing the Giants V: Galaxy Cluster Scaling RelationsJun 10 2016Jan 30 2017We present constraints on the scaling relations of galaxy cluster X-ray luminosity, temperature and gas mass (and derived quantities) with mass and redshift, employing masses from robust weak gravitational lensing measurements. These are the first such ... More
Weighing the Giants V: Galaxy Cluster Scaling RelationsJun 10 2016Sep 26 2016We present constraints on the scaling relations of galaxy cluster X-ray luminosity, temperature and gas mass (and derived quantities) with mass and redshift, employing masses from robust weak gravitational lensing measurements. These are the first such ... More
SN 2015U: A Rapidly Evolving and Luminous Type Ibn SupernovaMar 15 2016Jul 26 2016Supernova (SN) 2015U (also known as PSN J07285387+3349106) was discovered in NGC 2388 on 2015 Feb. 11. A rapidly evolving and luminous event, it showed effectively hydrogen-free spectra dominated by relatively narrow helium P-Cygni spectral features and ... More
Constraints on the Progenitor System of the Type Ia Supernova 2014J from Pre-Explosion Hubble Space Telescope ImagingMar 17 2014Jun 09 2014We constrain the properties of the progenitor system of the highly reddened Type Ia supernova (SN) 2014J in Messier 82 (M82; d ~ 3.5 Mpc). We determine the SN location using Keck-II K-band adaptive optics images, and we find no evidence for flux from ... More
Spike timing-dependent plasticity induces complexity in the brainJan 08 2016To study neuroplasticity, the capacity of neurons and neural networks to change temporarily or permanently their connections and behavior, we investigate the effects of spike timing-dependent plasticity (STDP) on synchronization in Hodgkin-Huxley neural ... More
Synaptic Plasticity and Spike Synchronisation in Neuronal NetworksSep 01 2017Brain plasticity, also known as neuroplasticity, is a fundamental mechanism of neuronal adaptation in response to changes in the environment or due to brain injury. In this review, we show our results about the effects of synaptic plasticity on neuronal ... More
Searching for Highly Magnified Stars at Cosmological Distances: Discovery of a Redshift 0.94 Blue Supergiant in Archival Images of the Galaxy Cluster MACS J0416.1-2403Feb 14 2019Individual highly magnified stars have been recently discovered at lookback times of more than half the age of the Universe, in lensed galaxies that straddle the critical curves of massive galaxy clusters. Having confirmed their detectability, it is now ... More
Time-Varying Potassium in High-Resolution Spectra of the Type Ia Supernova 2014JNov 30 2014We present a time series of the highest resolution spectra yet published for the nearby Type Ia supernova (SN) 2014J in M82. They were obtained at 11 epochs over 33 days around peak brightness with the Levy Spectrograph (resolution R~110,000) on the 2.4m ... More
Mycobiome of the Bat White Nose Syndrome (WNS) Affected Caves and Mines reveals High Diversity of Fungi and Local Adaptation by the Fungal Pathogen Pseudogymnoascus (Geomyces) destructansMar 03 2014Oct 06 2014The investigations of the bat White Nose Syndrome (WNS) have yet to provide answers as to how the causative fungus Pseudogymnoascus (Geomyces) destructans (Pd) first appeared in the Northeast and how a single clone has spread rapidly in the US and Canada. ... More
Multiplexed Charge-locking Device for Large Arrays of Quantum DevicesAug 12 2014Aug 21 2014We present a method of forming and controlling large arrays of gate-defined quantum devices. The method uses a novel, on-chip, multiplexed charge-locking system and helps to overcome the restraints imposed by the number of wires available in cryostat ... More
IR observations of MS 1054-03: Star Formation and its Evolution in Rich Galaxy ClustersApr 06 2007We study the infrared (IR) properties of galaxies in the cluster MS 1054-03 at z=0.83 by combining MIPS 24 micron data with spectra of more than 400 galaxies and a very deep K-band selected catalog. 19 IR cluster members are selected spectroscopically, ... More
Measuring the value of the Hubble constant "à la Refsdal"Feb 05 2018May 03 2018Realizing Refsdal's original idea from 1964, we present estimates of the Hubble constant that are complementary to and potentially competitive with those of other cosmological probes. We use the observed positions of 89 multiple images, with extensive ... More
Tubulin bond energies and microtubule biomechanics determined from nanoindentation in silicoJan 26 2015Microtubules, the primary components of the chromosome segregation machinery, are stabilized by longitudinal and lateral non-covalent bonds between the tubulin subunits. However, the thermodynamics of these bonds and the microtubule physico-chemical properties ... More
Astro2020 Decadal Science White Paper: Gravitational Wave Survey of Galactic Ultra Compact BinariesMar 13 2019Ultra-compact binaries (UCBs) are systems containing compact or degenerate stars with orbital periods less than one hour. Tens of millions of UCBs are predicted to exist within theGalaxy emitting gravitational waves (GWs) at mHz frequencies. Combining ... More
The unique potential of extreme mass-ratio inspirals for gravitational-wave astronomyMar 08 2019The inspiral of a stellar-mass compact object into a massive ($\sim 10^{4}$-$10^{7} M_{\odot}$) black hole produces an intricate gravitational-wave signal. Due to the extreme-mass ratios involved, these systems complete $\sim 10^{4}$-$10^{5}$ orbits, ... More
Revealing the Photodissociation Region: Hubble Space Telescope/NICMOS Imaging of NGC 7027Feb 25 2000We report results from a Hubble Space Telescope (HST) and Near-Infrared Camera and Multiobject Spectrometer (NICMOS) program to study the distribution of hot neutral (molecular hydrogen) and ionized circumstellar material in the young planetary nebulae ... More
Metal Deficiency in Two Massive Dead Galaxies at $z\sim2$Mar 05 2018Local massive early-type galaxies are believed to have completed most of their star formation $\sim10$Gyr ago and evolved without having substantial star formation since. If so, their progenitors should have roughly solar stellar metallicities ($Z_*$), ... More
A series of shocks and edges in Abell 2219May 21 2015We present deep, 170 ks, Chandra X-ray observations of Abell 2219 (z=0.23) one of the hottest and most X-ray luminous clusters known, and which is experiencing a major merger event. We discover a 'horseshoe' of high temperature gas surrounding the ram-pressure-stripped, ... More
Morphology of AGN Emission Line Regions in SDSS-IV MaNGA SurveyMay 17 2018Nov 11 2018Extended narrow-line regions (NLRs) around active galactic nuclei (AGN) are shaped by the distribution of gas in the host galaxy and by the geometry of the circumnuclear obscuration, and thus they can be used to test the AGN unification model. In this ... More
Measuring the value of the Hubble constant "à la Refsdal"Feb 05 2018Realizing Refsdal's original idea from 1964, we present estimates of the Hubble constant that are complementary to and potentially competitive with those of other cosmological probes. We use the observed positions of 89 multiple images, with extensive ... More
HST/NICMOS Imaging of the Planetary Nebula Hubble 12Feb 14 2000Images of Hubble 12 were obtained with the HST/NICMOS instrument in the F110W, F164N, and F166N filters of NIC1, and the F160W, F187N, F190N, F212N, F215N filters of NIC2. The images show the structure of the inner ``torus'' and lobes much clearer than ... More
MARVEL analysis of the measured high-resolution rovibrational spectra of C2H2Sep 11 2017Rotation-vibration energy levels are determined for the electronic ground state of the acetylene molecule, $^{12}$C$_2$H$_2$, using the Measured Active Rotational-Vibrational Energy Levels (MARVEL) technique. 37,813 measured transitions from 61 publications ... More
Constraints on the Progenitor of SN 2010jl and Pre-Existing Hot Dust in its Surrounding MediumAug 16 2017A search for the progenitor of SN~2010jl, an unusually luminous core-collapse supernova of Type~IIn, using pre-explosion {\it Hubble}/WFPC2 and {\it Spitzer}/IRAC images of the region, yielded upper limits on the UV and near-infrared (IR) fluxes from ... More
Compressed sensing quantum process tomography for superconducting quantum gatesJul 03 2014We apply the method of compressed sensing (CS) quantum process tomography (QPT) to characterize quantum gates based on superconducting Xmon and phase qubits. Using experimental data for a two-qubit controlled-Z gate, we obtain an estimate for the process ... More
Atmospheric Parameters of Field L and T DwarfsNov 06 2007We present an analysis of the 0.95-14.5 micron spectral energy distributions of nine field ultracool dwarfs with spectral types ranging from L1 to T4.5. Effective temperatures, gravities, and condensate cloud sedimentation efficiencies are derived by ... More
The Progenitor of Supernova 2011dh Has VanishedMay 15 2013Jul 08 2013We conducted Hubble Space Telescope (HST) Snapshot observations of the Type IIb Supernova (SN) 2011dh in M51 at an age of ~641 days with the Wide Field Camera 3. We find that the yellow supergiant star, clearly detected in pre-SN HST images, has disappeared, ... More
Cosmology and Astrophysics from Relaxed Galaxy Clusters II: Cosmological ConstraintsFeb 25 2014Mar 21 2014We present cosmological constraints from measurements of the gas mass fraction, $f_{gas}$, for massive, dynamically relaxed galaxy clusters. Our data set consists of Chandra observations of 40 such clusters, identified in a comprehensive search of the ... More
Ab-initio prediction of the electronic and optical excitations in polythiophene: isolated chains versus bulk polymerApr 04 2000We calculate the electronic and optical excitations of polythiophene using the GW approximation for the electronic self-energy, and include excitonic effects by solving the electron-hole Bethe-Salpeter equation. Two different situations are studied: excitations ... More
Measuring cosmic distances with galaxy clustersJul 30 2013In addition to cosmological tests based on the mass function and clustering of galaxy clusters, which probe the growth of cosmic structure, nature offers two independent ways of using clusters to measure cosmic distances. The first uses measurements of ... More
Zooming into local active galactic nuclei: The power of combining SDSS-IV MaNGA with higher resolution integral field unit observationsOct 05 2016Ionized gas outflows driven by active galactic nuclei (AGN) are ubiquitous in high luminosity AGN with outflow speeds related to the total bolometric luminosity of the AGN. This relation suggests a threshold luminosity of 10^(43-45) erg/s above which ... More
Massive Dead Galaxies at z~2 with HST Grism Spectroscopy I. Star Formation and Metallicity Enrichment HistoriesDec 17 2018Observations have revealed log M*/Msun >11 galaxies that were already dead when the universe was only ~2Gyr. Given the short time before these galaxies were quenched, their past histories and quenching mechanism(s) are of particular interests. In this ... More
New constraints on $f(R)$ gravity from clusters of galaxiesNov 29 2014Aug 08 2015The abundance of massive galaxy clusters is a powerful probe of departures from General Relativity (GR) on cosmic scales. Despite current stringent constraints placed by stellar and galactic tests, on larger scales alternative theories of gravity such ... More
Multi-epoch spectropolarimetry of SN 2009ip: direct evidence for aspherical circumstellar materialMar 17 2014Dec 15 2014We present spectropolarimetry of SN 2009ip throughout the evolution of its 2012 explosion. During the initial 2012a phase, when the source spectrum exhibits broad P-Cygni lines, we measure a V-band polarization of P~0.9% at a position angle of ~166 deg, ... More
After the Fall: Late-Time Spectroscopy of Type IIP SupernovaeOct 24 2016Herein we analyse late-time (post-plateau; 103 < t < 1229 d) optical spectra of low-redshift (z < 0.016), hydrogen-rich Type IIP supernovae (SNe IIP). Our newly constructed sample contains 91 nebular spectra of 38 SNe IIP, which is the largest dataset ... More
After the Fall: Late-Time Spectroscopy of Type IIP SupernovaeOct 24 2016Oct 29 2016Herein we analyse late-time (post-plateau; 103 < t < 1229 d) optical spectra of low-redshift (z < 0.016), hydrogen-rich Type IIP supernovae (SNe IIP). Our newly constructed sample contains 91 nebular spectra of 38 SNe IIP, which is the largest dataset ... More
Cosmology and astrophysics from relaxed galaxy clusters - IV: Robustly calibrating hydrostatic masses with weak lensingSep 07 2015This is the fourth in a series of papers studying the astrophysics and cosmology of massive, dynamically relaxed galaxy clusters. Here, we use measurements of weak gravitational lensing from the Weighing the Giants project to calibrate Chandra X-ray measurements ... More
Endurance of SN 2005ip after a decade: X-rays, radio, and H-alpha like SN 1988Z require long-lived pre-supernova mass lossDec 06 2016SN2005ip was a TypeIIn event notable for its sustained strong interaction with circumstellar material (CSM), coronal emission lines, and IR excess, interpreted as shock interaction with the very dense and clumpy wind of an extreme red supergiant. We present ... More