Latest in astro-ph

total 248785took 0.14s
Spatially resolved spectroscopy of the debris disk HD 32297: Further evidence of small dust grainsAug 22 2019Spectro-photometry of debris disks in total intensity and polarimetry can provide new insight into the properties of the dust grains therein (size distribution and optical properties). We aim to constrain the morphology of the highly inclined debris disk ... More
Measuring $H_0$ in PTA with gravitational wavesAug 22 2019Pulsar Timing Arrays have yet to find convincing evidence of gravitational waves. Some time ago it was pointed out by one of the authors that a dramatic enhancement of the signal would take place for particular values of the angle subtended by the source ... More
Discovery of tidally-perturbed pulsations in the eclipsing binary U Gru: a pioneering system for tidal asteroseismologyAug 22 2019The interior physics of stars is currently not well constrained for early-type stars. This is particularly pertinent for multiple systems as binary interaction becomes more prevalent for more massive stars, which strongly affects their evolution. High-precision ... More
The amplitude of the kilohertz quasi-periodic oscillations in 4U 1636$-$53 in the frequency-energy spaceAug 22 2019We present for the neutron-star low-mass X-ray binary 4U 1636$-$53, and for the first time for any source of kilohertz quasi-periodic oscillations (kHz QPOs), the two-dimensional behaviour of the fractional rms amplitude of the kHz QPOs in the parameter ... More
Searches for steady neutrino emission from 3FHLblazars using eight years of IceCube data from theNorthern hemisphereAug 22 2019Located at the South Pole, the IceCube Neutrino Observatory is the world largest neutrino telescope, instrumenting one cubic kilometre of Antarctic ice at a depth between 1450m to 2450m. In 2013 IceCube reported the first observations of a diffuse astrophysical ... More
Validating time-distance helioseismic inversions for non-separable subsurface profiles of an average supergranuleAug 22 2019Supergranules are divergent 30-Mm sized cellular flows observed everywhere at the solar photosphere. Their place in the hierarchy of convective structures and their origin remain poorly understood (Rincon et al., 2018). Estimating supergranular depth ... More
On the recent parametric determination of an asteroseismological model for the DBV star KIC 08626021Aug 22 2019Asteroseismology of white dwarf (WD) stars is a powerful tool that allows to reveal the hidden chemical structure of WD and infer details about their evolution by comparing the observed periods with those obtained from stellar models. A recent asteroseismological ... More
Characterization of Two PMT Models for the IceCube Upgrade mDOMAug 22 2019The IceCube Upgrade will expand the IceCube Neutrino Observatory with nearly 800 new optical modules. A large fraction of these will be multi-PMT optical modules (mDOMs), featuring 24 PMTs pointing uniformly in all directions, providing an almost homogeneous ... More
What Determines the Sizes of Bars in Spiral Galaxies?Aug 22 2019I use volume- and mass-limited subsamples and recently published data from the Spitzer Survey of Stellar Structure in Galaxies (S4G) to investigate how the size of bars depends on galaxy properties. The known correlation between bar semi-major-axis $a$ ... More
Multi-messenger tests of cosmic-ray acceleration in radiatively inefficient accretion flowsAug 22 2019The cores of active galactic nuclei (AGNs) have been suggested as the sources of IceCube neutrinos, and recent numerical simulations have indicated that hot AGN coronae of Seyfert galaxies and radiatively inefficient accretion flows (RIAFs) of low-luminosity ... More
Discovery of weak magnetic fields in four DZ white dwarfs in the local 20pc volume. Implications for the frequency of magnetic fields with cooling ageAug 22 2019We report the discovery of weak magnetic fields in three white dwarfs within the local 20pc volume (WD 0816-310, WD 1009-184, and WD 1532+129), and we confirm the magnetic nature of a fourth star (WD 2138-332) in which we had previously detected a field ... More
ALMA CO Observations of a Giant Molecular Cloud in M33: Evidence for High-Mass Star Formation Triggered by Cloud-Cloud CollisionsAug 22 2019We report the first evidence for high-mass star formation triggered by collisions of molecular clouds in M33. Using the Atacama Large Millimeter/submillimeter Array, we spatially resolved filamentary structures of giant molecular cloud 37 in M33 using ... More
Galaxy number counts at second order: an independent approachAug 22 2019Next generation surveys will be capable of determining cosmological parameters beyond percent level.To match this precision, theoretical descriptions should look beyond the linear perturbations to approximate the observables in large scale structure. ... More
Puffy accretion disks: sub-Eddington, optically thick, and stableAug 22 2019We report on a new class of solutions of black hole accretion disks that we have found through three-dimensional, global, radiative magnetohydrodynamic simulations in general relativity. It combines features of the canonical thin, slim and thick disk ... More
The gravitational-wave follow-up program of the Cherenkov Telescope ArrayAug 22 2019The birth of gravitational-wave / electromagnetic astronomy was heralded by the joint observation of gravitational waves (GWs) from a binary neutron star (BNS) merger by Advanced LIGO and Advanced Virgo, GW170817, and of gamma-rays from the short gamma-ray ... More
Short Duration Stellar Flares in GALEX DataAug 22 2019We report on a population of short duration near-ultraviolet (NUV) flares in stars observed by the Kepler and GALEX missions. We analyzed NUV light curves of 34,276 stars observed from 2009-2013 by both the GALEX (NUV) and Kepler (optical) space missions ... More
H.E.S.S. searches for TeV gamma rays associated to high-energy neutrinosAug 22 2019The detection of an astrophysical flux of high-energy neutrinos by IceCube is a major step forward in the search for the origin of cosmic rays, as this emission is expected to originate in hadronic interactions taking place in or near cosmic-ray accelerators. ... More
Properties of barred galaxies in the MaNGA galaxy surveyAug 22 2019We present the initial results of a census of 684 barred galaxies in the MaNGA galaxy survey. This large sample contains galaxies with a wide range of physical properties, and we attempt to link bar properties to key observables for the whole galaxy. ... More
First search for GeV neutrinos from bright gamma-ray solar flares using the IceCube Neutrino ObservatoryAug 22 2019In response to a reported increase in the total neutrino flux in the Homestake experiment in coincidence with solar flares at the end of the eighties, solar neutrino detectors have searched for solar flare signals. Solar flares convert magnetic energy ... More
Probing neutrino emission at GeV energies from compact binary mergers with IceCubeAug 22 2019The advent of Multi-Messenger Astronomy has allowed for new types of source searches within the neutrino community. We present the results of the first search for GeV astrophysical neutrinos emitted from Compact Binary Mergers, i.e. binary black hole ... More
A Sparkler in the Fireworks Galaxy: Discovery of an Ultraluminous X-ray Transient with a Strong Oxygen Line in NGC 6946Aug 22 2019We discovered and studied an ultraluminous X-ray source (CXOU J203451.1+601043) that appeared in the spiral galaxy NGC 6946 at some point between 2008 February and 2012 May, and has remained at luminosities $\approx$2-4 $\times 10^{39}$ erg s$^{-1}$ in ... More
Into the Darkness: Classical and Type II Cepheids in the Zona Galactica IncognitaAug 22 2019The far side of the Milky Way's disk is one of the most concealed parts of the known Universe due to extremely high interstellar extinction and point source density toward low Galactic latitudes. Large time-domain photometric surveys operating in the ... More
Contour Detection in Cassini ISS images based on Hierarchical Extreme Learning Machine and Dense Conditional Random FieldAug 22 2019In Cassini ISS (Imaging Science Subsystem) images, contour detection is often performed on disk-resolved object to accurately locate their center. Thus, the contour detection is a key problem. Traditional edge detection methods, such as Canny and Roberts, ... More
Revisiting the expected Micro-X signal from the 3.5 keV lineAug 22 2019One of the future instruments to resolve the origin of the unidentified 3.5 keV emission line is the Micro-X sounding rocket telescope. According to the estimate made in 2015, Micro-X will be able to detect on average about 18.2 photons from the 3.5 keV ... More
A short observational view of black hole X-ray binaries with INTEGRALAug 22 2019Accreting black holes are unique tools to understand the physics under extreme gravity. While black hole X-ray binaries differ vastly in mass from AGN, their accretion and ejection flows are assumed to be essentially similar. Black hole X-ray binaries ... More
Searches for point-like sources of cosmic neutrinos with 11 years of ANTARES dataAug 22 2019The main goal of the ANTARES neutrino telescope is the identification of neutrinos from cosmic accelerators. The good visibility towards the Southern sky for neutrino energies below 100 TeV and the good angular resolution for reconstructed events make ... More
Constraints on Quasi-dilaton Massive GravityAug 22 2019The last decade has seen great advancements in the field of modified gravity, motivated by the dark energy problem, or by the search for a fundamental quantum gravity theory. With a phenomenologically-driven approach, we consider dRGT theory and its extension, ... More
Dark matter searches with the IceCube UpgradeAug 22 2019Weakly Interacting Massive Particles (WIMPs) are well-motivated candidates for Dark Matter (DM). WIMP models often include self-annihilation into Standard Model particles such as neutrinos which could potentially be detected by the IceCube Neutrino Observatory. ... More
Planetary-scale variations in winds and UV brightness at the Venusian cloud top: Periodicity and temporal evolutionAug 22 2019Planetary-scale waves at the Venusian cloud-top cause periodic variations in both winds and ultraviolet (UV) brightness. While the wave candidates are the 4-day Kelvin wave and 5-day Rossby wave with zonal wavenumber 1, their temporal evolutions are poorly ... More
Nonlinear Reconstruction of the Velocity FieldAug 22 2019We propose a new velocity reconstruction method based on the displacement estimation by recently developed methods. The velocity is first reconstructed by transfer functions in Lagrangian space and then mapped into Eulerian space. High resolution simulations ... More
Discovery of an Outbursting 12.8 Minute Ultracompact X-Ray BinaryAug 22 2019We report the discovery of OGLE-UCXB-01, a 12.8 minute variable object located in the central field of Galactic bulge globular cluster Djorg 2. The presence of frequent, short-duration brightenings at such an ultrashort period in long-term OGLE photometry ... More
Early acceleration of electrons and protons at the nonrelativistic quasiparallel shocks with different obliquity anglesAug 22 2019The early acceleration of protons and electrons in the nonrelativistic collisionless shocks with three obliquities are investigated through 1D particle-in-cell simulations. In the simulations, the charged particles possessing a velocity of $0.2\, c$ flow ... More
X-ray Intra-day Variability of the TeV Blazar Mrk 421 with SuzakuAug 22 2019We present X-ray flux and spectral analyses of the three pointed Suzaku observations of the TeV high synchrotron peak blazar Mrk 421 taken throughout its complete operational duration. The observation taken on 5 May 2008 is, at 364.6 kiloseconds (i.e., ... More
Not so different after all: Properties and Spatial Structure of Column Density Peaks in the Pipe and Orion A CloudsAug 22 2019We present a comparative study of the physical properties and the spatial distribution of column density peaks in two Giant Molecular Clouds (GMC), the Pipe Nebula and Orion A, which exemplify opposite cases of star cluster formation stages. The density ... More
Cosmic Ray Spectrum and Composition from PeV to EeV from the IceCube Neutrino ObservatoryAug 21 2019The IceCube Neutrino Observatory at the South Pole is a multi-component detector capable of measuring the cosmic ray energy spectrum and composition from PeV to EeV, the energy region typically thought to cover the transition from galactic to extragalactic ... More
Kinetic Simulations of Radiative Magnetic Reconnection in the Magnetized Coronae of Accreting Black HolesAug 21 2019We perform two-dimensional particle-in-cell simulations of reconnection in magnetically dominated electron-positron plasmas subject to strong Compton cooling. Magnetic reconnection under such conditions can operate in accretion disk coronae around black ... More
Delensing Degree-Scale $B$-Mode Polarization with High-Redshift Line Intensity MappingAug 21 2019Cosmic microwave background (CMB) experiments that constrain the tensor-to-scalar ratio $r$ are now approaching the sensitivity at which delensing---removing the $B$ modes induced by the gravitational lensing of large-scale structure---is necessary. We ... More
HII versus HI in the `green valley' galaxies: direct comparisonAug 21 2019We study the morphology and kinematics of the ionization state of the gas in four 'green valley' early-type galaxies at different stages of their transition from a 'blue cloud' of star-forming galaxies to the sequence of passive evolution. The previous ... More
Interpretation of shadows and antishadows on Saturn and the evidence against south polar eyewallsAug 21 2019Cassini spacecraft observations of Saturn in 2006 revealed south polar cloud shadows, the common interpretation of which was initiated by Dyudina et al. (2008, Science 319, 1801) who suggested they were being cast by concentric cloud walls, analogous ... More
Laboratory Calibrations of Fe XII-XIV Line-Intensity Ratios for Electron Density DiagnosticsAug 21 2019We have used an electron beam ion trap to measure electron-density-diagnostic line-intensity ratios for extreme ultraviolet lines from F XII, XIII, and XIV at wavelengths of 185-205 255-276 Angstroms. These ratios can be used as density diagnostics for ... More
Saturn's south polar cloud composition and structure inferred from 2006 Cassini/VIMS spectra and ISS imagesAug 21 2019We used 0.85 - 5.1 micron 2006 observations by Cassini's Visual and Infrared Mapping Spectrometer (VIMS) to constrain the unusual vertical structure and compositions of cloud layers in Saturn's south polar region, the site of a powerful vortex circulation, ... More
X-ray properties of z>4 blazarsAug 21 2019We present the X-ray analysis of the largest flux-limited complete sample of blazar candidates at z>4 selected from the Cosmic Lens All Sky Survey (CLASS). After obtaining a nearly complete (24/25) X-ray coverage of the sample (from Swift-XRT, XMM-Newton ... More
FIRTEZ-dz: A Forward and Inverse solver of the polarized Radiative Transfer Equation under Zeeman regime in geometrical scaleAug 21 2019We present a numerical code that solves the forward and inverse problem of the polarized radiative transfer equation in geometrical scale under the Zeeman regime. The code is fully parallelized, making it able to easily handle large observational and ... More
Consistency of the Infrared Variability of Sgr A* over 22 yearsAug 21 2019We report new infrared measurements of the supermassive black hole at the Galactic Center, Sgr A*, over a decade that was previously inaccessible at these wavelengths. This enables a variability study that addresses variability timescales that are ten ... More
Impact of Cosmic-Ray Feedback on Accretion and Chemistry in Circumstellar DisksAug 21 2019We use the gas-grain chemistry code UCLCHEM to explore the impact of cosmic-ray feedback on the chemistry of circumstellar disks. We model the attenuation and energy losses of the cosmic-rays as they propagate outwards from the star and also consider ... More
A search for IceCube events in the direction of ANITA neutrino candidatesAug 21 2019The Antarctic Impulsive Transient Antenna (ANITA) collaboration has reported a total of three neutrino candidates from the experiment's first three flights. One of these was the lone candidate in a search for Askaryan radio emission, and the others can ... More
Bias to CMB lensing from lensed foregroundsAug 21 2019Extragalactic foregrounds are known to constitute a limiting systematic in temperature-based CMB lensing with AdvACT, SPT-3G, Simons Observatory and CMB S4. Furthermore, since these foregrounds are emitted at cosmological distances, they are also themselves ... More
The Progenitors of Calcium-Strong TransientsAug 21 2019A new class of faint, spectroscopically peculiar transients has emerged in the last decade. We term these events "calcium-strong transients" (CaSTs) because of their atypically high calcium-to-oxygen nebular line ratios. Previous studies have struggled ... More
Structural and Stellar Population Properties vs. Bulge Types in Sloan Digital Sky Survey Central GalaxiesAug 21 2019This paper studies pseudo-bulges (P-bulges) and classical bulges (C-bulges) in Sloan Digital Sky Survey central galaxies using the new bulge indicator $\Delta\Sigma_1$, which measures relative central stellar-mass surface density within 1 kpc. We compare ... More
The case of NGC 6302: The impact of shocks in the derivation of Nitrogen abundancesAug 21 2019High nitrogen abundance is characteristic of Type I planetary nebulae as well as their highly filamentary structure. In the present work we test the hypothesis of shocks as a relevant excitation mechanism for a Type-I nebula, NGC 6302, using recently ... More
Tidal circularization of gaseous planets orbiting white dwarfsAug 21 2019A gas giant planet which survives the giant branch stages of evolution at a distance of many au and then is subsequently perturbed sufficiently close to a white dwarf will experience orbital shrinkage and circularization due to star-planet tides. The ... More
The Optical Afterglow of GW170817: An Off-axis Structured Jet and Deep Constraints on a Globular Cluster OriginAug 21 2019We present a revised and complete optical afterglow light curve of the binary neutron star merger GW170817, enabled by deep Hubble Space Telescope (HST) F606W observations at $\approx\!584$ days post-merger, which provide a robust optical template. The ... More
Modeling the Gaia Color-Magnitude Diagram with Bayesian Neural Flows to Constrain Distance EstimatesAug 21 2019We demonstrate an algorithm for learning a flexible color-magnitude diagram from noisy parallax and photometry measurements using a normalizing flow, a deep neural network capable of learning an arbitrary multi-dimensional probability distribution. We ... More
Interpretation and diversity of exoplanetary material orbiting white dwarfsAug 21 2019Nine metal-polluted white dwarfs are observed with medium-resolution optical spectroscopy,where photospheric abundances are determined and interpreted through comparison against solar system objects. An improved method of making such comparisons is presented ... More
Modeling Time Dependent Water Chemistry Due to Powerful X-ray Flares from T-Tauri StarsAug 21 2019Young stars emit strong flares of X-ray radiation that penetrate the surface layers of their associated protoplanetary disks. It is still an open question as to whether flares create significant changes in disk chemical composition. We present models ... More
Kinetic turbulence in shining pair plasma: intermittent beaming and thermalization by radiative coolingAug 21 2019High-energy astrophysical systems frequently contain collisionless relativistic plasmas that are heated by turbulent cascades and cooled by emission of radiation. Understanding the nature of this radiative turbulence is a frontier of extreme plasma astrophysics. ... More
A NICER Look at Strong X-ray Obscuration in the Seyfert-2 Galaxy NGC 4388Aug 21 2019We present an analysis of the time-averaged spectrum of the Seyfert-2 active galaxy NGC 4388, obtained by NICER. The intrinsic strength of the reflection spectrum in NGC 4388, the large collecting area and favorable pass band of NICER, and a net exposure ... More
Variability of Ha emission in young stellar objects in the cluster IC 348Aug 21 2019The aim of this work is to identify and study the stellar objects with variable EW(Ha) in the young stellar cluster IC 348. We performed photometric and slit-less observations at several epochs in order to reveal the variable objects. Significant variability ... More
Glitching pulsars: unraveling the interactions of general relativity with quantum fields in the strong field regimesAug 21 2019We present a modification of our previous model for the mechanisms underlying the glitch phenomena in pulsars and young neutron stars. Accordingly, pulsars are born with embryonic cores comprising of purely incompressible superconducting gluon-quark superfluid ... More
Counter-Rotation and High Velocity Outflow in the Parsec-Scale Molecular Torus of NGC 1068Aug 21 2019We present 1.4 pc resolution observations of 256 GHz nuclear radio continuum and HCN ($J=3 \to 2$) in the molecular torus of NGC 1068. The integrated radio continuum emission has a flat spectrum consistent with free-free emission and resolves into an ... More
Main trends of the quasar main sequence -- effect of viewing angleAug 21 2019We address the effect of the viewing angle of the accretion disk plane and the geometry of the broad-line region (BLR) with the goal of interpreting the distribution of quasars along the main sequence (MS). We utilize photoionization code CLOUDY to model ... More
An improved muon track reconstruction for IceCubeAug 21 2019IceCube is a cubic-kilometer Cherenkov telescope operating at the South Pole. One of its main objectives is to detect astrophysical neutrinos and identify their sources. High-energy muon neutrinos are identified through the secondary muons produced via ... More
Rotating baryonic dark halosAug 21 2019Galactic halos are of great importance for our understanding of both the dark matter nature and primordial non-Gaussianity in the perturbation spectrum, a powerful discriminant of the physical mechanisms that generated the cosmological fluctuations observed ... More
The lateral distribution function of cosmic-ray induced air showers studied with the HAWC observatoryAug 21 2019The particle lateral distribution function (LDF) of air showers at a given altitude is sensitive to the mass composition and primary energy of cosmic rays. Studies of the LDF are difficult to perform due to experimental effects such as sampling bias, ... More
Spitzer catalog of Herschel-selected ultrared dusty, star-forming galaxiesAug 21 2019The largest Herschel extragalactic surveys, H-ATLAS and HerMES, have selected a sample of "ultrared" dusty, star-forming galaxies (DSFGs) with rising SPIRE flux densities ($S_{500} > S_{350} > S_{250}$; so-called "500 $\mu$m-risers") as an efficient way ... More
Parametrizations for tests of gravityAug 21 2019With the increasing wealth of high-quality astronomical and cosmological data and the manifold departures from General Relativity in principle conceivable, the development of generalized parametrization frameworks that unify gravitational models and cover ... More
Electron acceleration in non-relativistic quasi-perpendicular collisionless shocksAug 21 2019We study diffusive shock acceleration (DSA) of electrons in non-relativistic quasi-perpendicular shocks using self-consistent one-dimensional particle-in-cell (PIC) simulations. By exploring the parameter space of sonic and Alfv\'{e}nic Mach numbers we ... More
An atlas of coronal electron density at 5Rs II: A spherical harmonic method for density reconstructionAug 21 2019This is the second of a series of three papers that present a methodology with the aim of creating a set of maps of the coronal density over a period of many years. This paper describes a method for reconstructing the coronal electron density based on ... More
Reconstructing simulated CMB polarization power spectra with the Analytical Blind Separation methodAug 21 2019The Analytical Blind Separation (ABS) method is dedicated to extract the CMB signal from its contaminants without any prior information about foregrounds. In this study, we apply the ABS method to simulated polarization sky maps in order to test its ability ... More
Symmetrizing the signal distribution of radio emission from inclined air showersAug 21 2019Radio detection of inclined air showers currently receives special attention. It can be performed with very sparse antenna arrays and yields a pure measurement of the electromagnetic air-shower component, thus delivering information that is highly complementary ... More
SN 2018hna: 1987A-like supernova with a signature of shock breakoutAug 21 2019High cadence ultraviolet, optical and near-infrared photometric and low-resolution spectroscopic observations of the peculiar Type II supernova (SN) 2018hna are presented. The early phase multiband light curves exhibit the adiabatic cooling envelope emission ... More
Six-dimensional Myers-Perry rotating black hole cannot be overspunAug 21 2019Though under non-linear accretion, all black holes in four and higher dimensions obey the weak Cosmic Censorship Conjecture, however they generally violate it for the linear test particle accretion with the exception of five dimensional rotating black ... More
Rotational spectroscopy of methyl mercaptan CH$_3$$^{32}$SH at millimeter and submillimeter wavelengthsAug 21 2019We present a new global study of the millimeter (mm) wave, submillimeter (sub-mm) wave, and terahertz (THz) spectra of the lowest three torsional states of methyl mercaptan (CH$_3$SH). New measurements have been carried out between 50 and 510 GHz using ... More
Graphene Oxide Nanoparticles in the Interstellar MediumAug 21 2019Dust particles play a major role in the formation, evolution and chemistry of interstellar clouds, stars and planetary systems. Commonly identified forms include amorphous and crystalline carbon-rich particles and silicates. Also present in many astrophysical ... More
The Physical Origin of the Venus Low Atmosphere Chemical GradientAug 21 2019Venus shares many similarities with the Earth, but concomitantly, some of its features are extremely original. This is especially true for its atmosphere, where high pressures and temperatures are found at the ground level. In these conditions, carbon ... More
Stellar population astrophysics (SPA) with the TNG. GIANO-B spectroscopy of red supergiants in Alicante 7 and Alicante 10Aug 21 2019The Scutum complex in the inner disk of the Galaxy hosts a number of young clusters and associations of red supergiant stars that are heavily obscured by dust extinction. These stars are important tracers of the recent star formation and chemical enrichment ... More
The ALPINE-ALMA [CII] Survey: A Triple Merger at z~4.56Aug 21 2019We report the detection of [CII]158um emission from a system of three closely-separated sources in the COSMOS field at z~4.56, as part of the ALMA Large Program to INvestigate CII at Early times (ALPINE). The two dominant sources are closely associated, ... More
SITES: Solar Iterative Temperature Emission Solver for differential emission measure inversion of EUV observationsAug 21 2019Extreme UltraViolet (EUV) images of the optically-thin solar corona in multiple spectral channels give information on the emission as a function of temperature through differential emission measure (DEM) inversions. The aim of this paper is to describe, ... More
Supernova lightCURVE POPulation Synthesis II: Validation against supernovae with an observed progenitorAug 21 2019We use the results of a supernova light-curve population synthesis to predict the range of possible supernova light curves arising from a population of single-star progenitors that lead to type IIP supernovae. We calculate multiple models varying the ... More
Turbulence vs. fire hose instabilities: 3-D hybrid expanding box simulationsAug 21 2019The relationship between a decaying plasma turbulence and proton fire hose instabilities in a slowly expanding plasma is investigated using three-dimensional (3-D) hybrid expanding box simulations. We impose an initial ambient magnetic field along the ... More
Quantifying the impact of variable BLR diffuse continuum contributions on measured continuum inter-band delaysAug 21 2019We investigate the contribution of reprocessed continuum emission (1000A - 10,000A) originating in broad line region (BLR) gas, the diffuse continuum (DC), to the wavelength-dependent continuum delays measured in AGN disk reverberation mapping experiments. ... More
Planetary systems in a star cluster I: the Solar system scenarioAug 21 2019Young stars are mostly found in dense stellar environments, and even our own Solar system may have formed in a star cluster. Here, we numerically explore the evolution of planetary systems similar to our own Solar system in star clusters. We investigate ... More
Blast Waves from Magnetar Flares and Fast Radio BurstsAug 21 2019Magnetars younger than one century are expected to be hyper active. Besides winds powered by rotation they generate frequent magnetic flares, which launch powerful blast waves into the wind. These internal shocks act as masers producing fast (millisecond) ... More
The camera system for the IceCube UpgradeAug 21 2019The IceCube Neutrino Observatory is a cubic kilometer volume neutrino detector installed in the Antarctic at the geographic South Pole. Neutrinos are detected through the observation of Cherenkov light from charged relativistic particles generated in ... More
The SPICEcore Hole Camera SystemAug 21 2019IceCube is a cubic-kilometer scale neutrino telescope located at the geographic South Pole. The detector utilizes the extremely transparent Antarctic ice as a medium for detecting Cherenkov radiation from neutrino interactions. As a result of extensive ... More
GAUSS -- A Sample Return Mission to CeresAug 21 2019The goal of Project GAUSS is to return samples from the dwarf planet Ceres. Ceres is the most accessible ocean world candidate and the largest reservoir of water in the inner solar system. It shows active cryovolcanism and hydrothermal activities in recent ... More
XMM-Newton observations of the symbiotic recurrent nova T CrB: evolution of X-ray emission during the active phaseAug 21 2019We present an analysis of the XMM-Newton observations of the symbiotic recurrent nova T CrB, obtained during its active phase that started in 2015. The XMM-Newton spectra of T CrB have two prominent components: a soft one (0.2 - 0.6 keV), well represented ... More
Search for very-high-energy photons from Gamma-ray bursts with HAWCAug 21 2019Detections of very-high-energy (VHE; > 100 GeV) photons from Gamma-ray bursts (GRBs) can provide fundamental information on the involved radiative processes, physical composition of the ejecta and acceleration processes. The High Altitude Water Cherenkov ... More
First clear detection of the CCS Zeeman splitting toward the pre-stellar core, Taurus Molecular Cloud-1Aug 21 2019We report a first clear detection of the Zeeman splitting of a CCS emission line at 45 GHz toward a nearby prestellar dense filament, Taurus Molecular Cloud-1. We observed HC$_3$N non-Zeeman line simultaneously as the CCS line, and did not detect any ... More
A Search for IceCube Neutrinos from the First 33 Detected Gravitational Wave EventsAug 21 2019The discoveries of high-energy astrophysical neutrinos by IceCube in 2013 and of gravitational waves by LIGO in 2015 have enabled a new era of multi-messenger astronomy. Gravitational waves can identify the merging of compact objects such as neutron stars ... More
A wind-based unification model for NGC 5548: spectral holidays, non-disk emission, and implications for changing-look quasarsAug 21 2019The 180-day Space Telescope and Optical Reverberation Mapping campaign on NGC 5548 discovered an anomalous period, the broad-line region (BLR) holiday, in which the emission lines decorrelated from the continuum variations. This is important since the ... More
Radio Pulsar Sub-Populations (I) : The Curious Case of Nulling PulsarsAug 21 2019About 200 radio pulsars have been observed to exhibit nulling episodes - short and long. In this work, we consider the general characteristics of this sub-population of radio pulsars. It appears that the phenomenon of nulling may be preferentially experience ... More
The COS Absorption Survey of Baryon Harbors: The Galaxy Database and Cross-Correlation Analysis of OVI SystemsAug 21 2019We describe the survey for galaxies in the fields surrounding 9 sightlines to far-UV bright, z~1 quasars that define the COS Absorption Survey of Baryon Harbors (CASBaH) program. The photometry and spectroscopy that comprise the dataset come from a mixture ... More
Photospheric nitrogen abundances and carbon 12C/13C ratios of red giant starsAug 21 2019Nitrogen abundances and carbon isotope ratios (12C/13C) in the atmospheres of red giants are known to be influenced by dredge-up of H-burning products and serve as useful probes to study the nature of evolution-induced envelope mixing. We determined the ... More
Recent Advances in Frequency-Multiplexed TES Readout: Vastly Reduced Parasitics and an Increase in Multiplexing Factor with sub-Kelvin SQUIDsAug 20 2019Cosmic microwave background (CMB) measurements are fundamentally limited by photon statistics. Therefore, ground-based CMB observatories have been increasing the number of detectors that are simultaneously observing the sky. Thanks to the advent of monolithically ... More
Latest news from the HAWC outrigger arrayAug 20 2019The High Altitude Water Cherenkov (HAWC) observatory is a very high energy gamma-ray detector located in Mexico. In late 2018, the HAWC collaboration completed a major upgrade consisting of the addition of a sparse outrigger array of 345 small water Cherenkov ... More
Spallation-altered accreted compositions for X-ray bursts: Impact on ignition conditions and burst ashesAug 20 2019Dependable predictions of the X-ray burst ashes and light curves require a stringent constraint on the composition of the accreted material as an input parameter. Lower metallicity models are generally based on a metal deficient donor and all metals are ... More
Light diffusion in birefringent polycrystals and the IceCube ice anisotropyAug 20 2019The IceCube Neutrino Observatory instruments about 1 km^3 of deep, glacial ice at the geographic South Pole with 5160 photomultipliers to detect Cherenkov light from charged relativistic particles. The experiment pursues a wide range of scientific questions ... More
Quest for new physics using astrophysical neutrino flavor in IceCubeAug 20 2019We have detected astrophysical neutrinos in IceCube that can be used to probe astrophysical sources at ultra high scales. Here we report a search for anomalous space time effects using astrophysical neutrino flavor data in IceCube. New effective operators ... More
Quest for new physics using astrophysical neutrino flavor in IceCubeAug 20 2019Aug 22 2019We have detected astrophysical neutrinos in IceCube that can be used to probe astrophysical sources at ultra high scales. Here we report a search for anomalous space time effects using astrophysical neutrino flavor data in IceCube. New effective operators ... More