Results for "Kelvin Lagota"

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Green function and self-adjoint Laplacians on polyhedral surfacesFeb 08 2019Using Roelcke formula for the Green function, we explicitly construct a basis in the kernel of the adjoint Laplacian on a compact polyhedral surface $X$ and compute the $S$-matrix of $X$ at the zero value of the spectral parameter. We apply these results ... More
Homomorphisms Between Specht Modules of the Ariki Koike AlgebraAug 18 2011In this paper we generalize a theorem due to Lyle, extending its application to the setting of the Ariki-Koike algebra, and in doing so establish an analogue of the kernel intersection theorem. This in turn provides us with a means towards constructing ... More
Mass Additivity and A Priori EntailmentJan 29 2015The principle of mass additivity states that the mass of a composite object is the sum of the masses of its elementary components. Mass additivity is true in Newtonian mechanics but false in special relativity. Physicists have explained why mass additivity ... More
Surgery on postcritically finite rational maps by blowing up an arcDec 18 1995Using Thurston's characterization of postcritically finite rational functions as branched coverings of the sphere to itself, we give a new method of constructing new conformal dynamical systems out of old ones. Let $f(z)$ be a rational map and suppose ... More
Four Tails Problems for Dynamical Collapse TheoriesJan 23 2015The primary quantum mechanical equation of motion entails that measurements typically do not have determinate outcomes, but result in superpositions of all possible outcomes. Dynamical collapse theories (e.g. GRW) supplement this equation with a stochastic ... More
Interstellar Probes: The Benefits to Astronomy & AstrophysicsJan 11 2019Long range observations in the field of astronomy have opened up our understanding of the Solar System, the Galaxy and the wider Universe. In this paper we discuss the idea of direct in-situ reconnaissance of nearby stellar systems, using robotic probes. ... More
A Critical Review on the Assumptions of SETIJan 11 2019The Search for Extraterrestrial Intelligence (SETI) makes certain assumptions which guide all current search programs. To illustrate some, this includes (1) that interstellar flight is not possible (2) that the motivations of interstellar cultures are ... More
On Orbits of Order Ideals of Minuscule Posets II: HomomesySep 27 2015The Fon-Der-Flaass action partitions the order ideals of a poset into disjoint orbits. For a product of two chains, Propp and Roby observed --- across orbits --- the mean cardinality of the order ideals within an orbit to be invariant. That this phenomenon, ... More
Existence of solutions to principal-agent problems under general preferences and non-compact allocation spaceFeb 18 2019We give an existence result for the principal-agent problem with adverse selection under general preferences and non-compact allocation space. The result is mainly based on the fact that the principal can always improve a feasible contract by another ... More
A Colored Petri Net Model of Simulation for Performance Evaluation for IEEE 802.22 based NetworkAug 30 2016Sep 20 2016Cognitive Radio is a new concept that allows radio devices access to licensed bands since they do not cause harmful interferences to systems that hold the license of use. The main motivation for the increase of research on Cognitive Radio is the scarcity ... More
Bayesian hierarchical modeling of simply connected 2D shapesJan 08 2012Models for distributions of shapes contained within images can be widely used in biomedical applications ranging from tumor tracking for targeted radiation therapy to classifying cells in a blood sample. Our focus is on hierarchical probability models ... More
Ground state of a resonant two-qubit Rabi model in the ultrastrong coupling regimeMar 14 2013Mar 15 2013We consider a generalized Rabi model formed by two identical qubits interacting with a common oscillator mode. In the near resonance configuration where the oscillator frequency is close to the transition frequency of the qubit, we determine the ground ... More
Skew plane partitions according to the $m$th largest and $m$th smallest partsSep 16 2016We extend recent results by G. E. Andrews and G. Simay on the $m$th largest and $m$th smallest parts of a partition to the more general context of skew plane partitions. In order to do this, we introduce new objects called skew plane overpartitions.
Information, uncertainty and holographic actionJun 09 2016In this short note we show through simple derivation the explicit relation between information flow and the theories of the emergence of space-time and gravity, specifically for Newton's second law of motion. Next, in a rather straightforward derivation ... More
Traversing Knowledge Graphs in Vector SpaceJun 03 2015Aug 19 2015Path queries on a knowledge graph can be used to answer compositional questions such as "What languages are spoken by people living in Lisbon?". However, knowledge graphs often have missing facts (edges) which disrupts path queries. Recent models for ... More
Linear and cyclic distance-three labellings of treesSep 06 2013Mar 24 2015Given a finite or infinite graph $G$ and positive integers $\ell, h_1, h_2, h_3$, an $L(h_1, h_2, h_3)$-labelling of $G$ with span $\ell$ is a mapping $f: V(G) \rightarrow \{0, 1, 2, \ldots, \ell\}$ such that, for $i = 1, 2, 3$ and any $u, v \in V(G)$ ... More
Environment-Assisted Quantum State Restoration Via Weak MeasurementApr 15 2014In this paper, a new quantum state restoration scheme is proposed based on the environment-assisted error correction (EAEC) scheme. By introducing a weak measurement reversal (WMR) operation, we shall show how to recover an initial state of a quantum ... More
Fabrication of High Aspect Ratio Micro-Penning-Malmberg Gold Plated Silicon Trap ArraysJul 09 2013Acquiring a portable high density charged particles trap might consist of an array of micro-Penning-Malmberg traps (microtraps) with substantially lower end barriers potential than conventional Penning-Malmberg traps [1]. We report on the progress of ... More
The totally asymmetric exclusion process with extended objects, a model for protein synthesisFeb 06 2003Sep 16 2003The process of protein synthesis in biological systems resembles a one dimensional driven lattice gas in which the particles have spatial extent, covering more than one lattice site. We expand the well studied Totally Asymmetric Exclusion Process (TASEP), ... More
Chip-level CMP Modeling and Smart Dummy for HDP and Conformal CVD FilmsNov 09 2000Chip-level CMP modeling is investigated to obtain the post-CMP film profile thickness across a die from its design layout file and a few film deposition and CMP parameters. The work covers both HDP and conformal CVD film. The experimental CMP results ... More
The effect of environment on the structure of disc galaxiesMay 28 2016Jan 20 2017We study the influence of environment on the structure of disc galaxies, using \texttt{IMFIT} to measure the g- and r-band structural parameters of the surface-brightness profiles for $\sim$700 low-redshift (z$<$0.063) cluster and field disc galaxies ... More
Mean field approaches to the totally asymmetric exclusion process with quenched disorder and large particlesMar 19 2004The process of protein synthesis in biological systems resembles a one dimensional driven lattice gas in which the particles (ribosomes) have spatial extent, covering more than one lattice site. Realistic, nonuniform gene sequences lead to quenched disorder ... More
A Controller-Recognizer Framework: How necessary is recognition for control?Nov 19 2015Feb 09 2016Recently there has been growing interest in building active visual object recognizers, as opposed to the usual passive recognizers which classifies a given static image into a predefined set of object categories. In this paper we propose to generalize ... More
Construction and Evaluation of Hierarchical Parcellation of the Brain using fMRI with PrewhiteningDec 21 2017Feb 07 2018Brain atlases are a ubiquitous tool used for analyzing and interpreting brain imaging datasets. Traditionally, brain atlases divided the brain into regions separated by anatomical landmarks. In the last decade, several attempts have been made to parcellate ... More
The Large-Scale Smoothness of the UniverseApr 06 1998Jun 27 1998New measurements of galaxy clustering and background radiations provide improved constraints on the isotropy and homogeneity of the Universe on large scales. In particular, the angular distribution of radio sources and the X-Ray Background probe density ... More
Multi-Commodity Flow with In-Network ProcessingFeb 26 2018Modern networks run "middleboxes" that offer services ranging from network address translation and server load balancing to firewalls, encryption, and compression. In an industry trend known as Network Functions Virtualization (NFV), these middleboxes ... More
Doppler-free, Multi-wavelength Acousto-optic deflector for two-photon addressing arrays of Rb atoms in a Quantum Information ProcessorNov 21 2007We demonstrate a dual wavelength acousto-optic deflector (AOD) designed to deflect two wavelengths to the same angles by driving with two RF frequencies. The AOD is designed as a beam scanner to address two-photon transitions in a two-dimensional array ... More
Local Inhomogeneity in Asymmetric Simple Exclusion Processes with Extended ObjectsOct 01 2003Totally asymmetric simple exclusion processes (TASEP) with particles which occupy more than one lattice site and with a local inhomogeneity far away from the boundaries are investigated. These non-equilibrium processes are relevant for the understanding ... More
Comment on "Experimental Studies of Os^-: Observation of a Bound-Bound Electric Dipole Transition in an Atomic Negative Ion"Aug 07 2012Bilodeau and Haugan [1], using Infrared laser photodetachment spectroscopy, measured the binding energies (BEs) of the ground state (4Fe9/2) and the excited state (4Fe7/2) of the Os^- ion to be 1.07780(12) eV and 0.553(3) eV, respectively. These values ... More
Machine Learning Phases of Strongly Correlated FermionsSep 08 2016Machine learning offers an unprecedented perspective for the problem of classifying phases in condensed matter physics. We employ neural network machine learning techniques to distinguish finite-temperature phases of the strongly-correlated fermions on ... More
On The Delays In Spiking Neural P SystemsDec 11 2012In this work we extend and improve the results done in a previous work on simulating Spiking Neural P systems (SNP systems in short) with delays using SNP systems without delays. We simulate the former with the latter over sequential, iteration, join, ... More
Time After Time: Notes on Delays In Spiking Neural P SystemsOct 23 2012Spiking Neural P systems, SNP systems for short, are biologically inspired computing devices based on how neurons perform computations. SNP systems use only one type of symbol, the spike, in the computations. Information is encoded in the time differences ... More
Methane Oxidation to Methanol without CO2 Emission: Catalysis by Atomic Negative IonsMar 03 2014The catalytic activities of the atomic Y-, Ru-, At-, In-, Pd-, Ag-, Pt-, and Os- ions have been investigated theoretically using the atomic Au- ion as the benchmark for the selective partial oxidation of methane to methanol without CO2 emission. Dispersion-corrected ... More
The effect of environment on the structure of disc galaxiesMay 28 2016Sep 29 2016We study the influence of environment on the structure of disc galaxies, using \texttt{IMFIT} to measure the g- and r-band structural parameters of the surface-brightness profiles for $\sim$700 low-redshift (z$<$0.063) cluster and field disc galaxies ... More
Brain Computer Interface Technologies in the Coming DecadesNov 05 2012As the proliferation of technology dramatically infiltrates all aspects of modern life, in many ways the world is becoming so dynamic and complex that technological capabilities are overwhelming human capabilities to optimally interact with and leverage ... More
Vacancy Relaxation in Cuprous Oxide (Cu$_{2-x}$O$_{1-y}$)Nov 27 2016Phonons are produced when an excited vacancy in cuprous oxide (Cu$_2$O) relaxes. Time resolved luminescence was used to find the excited copper vacancy (acceptor) and oxygen vacancy (donor) trap levels and lifetimes. It was also used to determine the ... More
A High-Level Reconfigurable Computing Platform Software FrameworksMay 05 2004Reconfigurable computing refers to the use of processors, such as Field Programmable Gate Arrays (FPGAs), that can be modified at the hardware level to take on different processing tasks. A reconfigurable computing platform describes the hardware and ... More
Show, Attend and Tell: Neural Image Caption Generation with Visual AttentionFeb 10 2015Apr 19 2016Inspired by recent work in machine translation and object detection, we introduce an attention based model that automatically learns to describe the content of images. We describe how we can train this model in a deterministic manner using standard backpropagation ... More
Uplink Contention Based SCMA for 5G Radio AccessJul 21 2014Jul 22 2014Fifth generation (5G) wireless networks are expected to support very diverse applications and terminals. Massive connectivity with a large number of devices is an important requirement for 5G networks. Current LTE system is not able to efficiently support ... More
SCMA for Downlink Multiple Access of 5G Wireless NetworksApr 22 2014Sparse code multiple access (SCMA) is a new frequency domain non-orthogonal multiple-access technique which can improve spectral efficiency of wireless radio access. With SCMA, different incoming data streams are directly mapped to codewords of different ... More
The near-IR $M_{bh}$ - L and $M_{bh}$ - n relationsOct 05 2011We present near-IR surface photometry (2D-profiling) for a sample of 29 nearby galaxies for which super-massive black hole (SMBH) masses are constrained. The data is derived from the UKIDSS-LASS survey representing a significant improvement in image quality ... More
Atomic Gold and Palladium Anion-Catalysis of Water to Peroxide: Fundamental MechanismJan 10 2012We have performed dispersion-corrected density-functional transition state calculations on atomic Au- and Pd- catalysis of water conversion to peroxide. The Au- ion is found to be an excellent catalyst; however, atomic Pd- has a higher catalytic effect ... More
Mid-infrared Active Graphene Nanoribbon Plasmonic Waveguide DevicesDec 30 2013Doped graphene emerges as a strong contender for active plasmonic material in the mid-infrared wavelengths due to the versatile external-control of its permittivity-function and also its highly-compressed graphene surface plasmon (GSP) wavelength. In ... More
Resolving Structure in Human Brain Organization: Identifying Mesoscale Organization in Weighted Network RepresentationsDec 20 2013Human brain anatomy and function display a combination of modular and hierarchical organization, suggesting the importance of both cohesive structures and variable resolutions in the facilitation of healthy cognitive processes. However, tools to simultaneously ... More
Massive Machine-type Communications in 5G: Physical and MAC-layer solutionsJun 13 2016Machine-type communications (MTC) are expected to play an essential role within future 5G systems. In the FP7 project METIS, MTC has been further classified into "massive Machine-Type Communication" (mMTC) and "ultra-reliable Machine-Type Communication" ... More
The Galaxy Stellar Mass Function and Low Surface Brightness Galaxies from Core-Collapse SupernovaeJan 15 2019We introduce a method for producing a galaxy sample unbiased by surface brightness and stellar mass, by selecting star-forming galaxies via the positions of core-collapse supernovae (CCSNe). Whilst matching $\sim$2400 supernovae from the SDSS-II Supernova ... More
An Actor-Critic Algorithm for Sequence PredictionJul 24 2016Jul 26 2016We present an approach to training neural networks to generate sequences using actor-critic methods from reinforcement learning (RL). Current log-likelihood training methods are limited by the discrepancy between their training and testing modes, as models ... More
Tunable Catalysis of Water to Peroxide with Anionic, Cationic, and Neutral Atomic Au, Ag, Pd, Rh, and OsOct 18 2014Fundamental anionic, cat-ionic, and neutral atomic metal predictions utilizing density functional theory calculations validate the recent discovery identifying the interplay between the resonances and the RT minimum obtained through complex angular momentum ... More
Plasmonic coupled-cavity system for enhancement of surface plasmon localization in plasmonic detectorsDec 30 2013A plasmonic coupled-cavity system, which consists of a quarter-wave coupler cavity, a resonant Fabry-Perot detector nanocavity, and an off-resonant reflector cavity, is used to enhance the localization of surface plasmons in a plasmonic detector. The ... More
On a four-parameters generalization of some special sequencesMay 14 2017We introduce a new four-parameters sequence that simultaneously generalizes some well-known integer sequences, including Fibonacci, Padovan, Jacobsthatl, Pell, and Lucas numbers. Combinatorial interpretations are discussed and many identities for this ... More
Vacancy Relaxation in Cuprous Oxide (Cu$_{2-x}$O$_{1-y}$)Nov 27 2016Nov 29 2016Phonons are produced when an excited vacancy in cuprous oxide (Cu$_2$O) relaxes. Time resolved luminescence was used to find the excited copper vacancy (acceptor) and oxygen vacancy (donor) trap levels and lifetimes. It was also used to determine the ... More
Photoionization cross section of 1s orthoexcitons in cuprous oxideJun 18 2014We report measurements of the attenuation of a beam of orthoexciton-polaritons by a photoionizing optical probe. Excitons were prepared in a narrow resonance by two photon absorption of a 1.016 eV, 54 ps pulsed light source in cuprous oxide (Cu2O) at ... More
Ultracompact Vanadium Dioxide Dual-Mode Plasmonic Waveguide Electroabsorption ModulatorDec 30 2013Subwavelength modulators play an indispensable role in integrated photonic-electronic circuits. Due to weak light-matter interactions, it is always a challenge to develop a modulator with a nanometer scale footprint, low switching energy, low insertion ... More
Electro-optical graphene plasmonic logic gatesMay 07 2014The versatile control of graphene's plasmonic modes via an external gate-voltage inspires us to design efficient electro-optical graphene plasmonic logic gates at the midinfrared wavelengths. We show that these devices are superior to the conventional ... More
Third Harmonic Generation in Cuprous Oxide: Efficiency DeterminationDec 27 2013The efficiency of third harmonic generation in cuprous oxide was measured. Intensities followed a non-cubic power law which indicates nonperturbative behavior. Polarization anisotropy of the harmonic generation was demonstrated and related to the third ... More
Choosing Wavelet Methods, Filters, and Lengths for Functional Brain Network ConstructionDec 23 2015Wavelet methods are widely used to decompose fMRI, EEG, or MEG signals into time series representing neurophysiological activity in fixed frequency bands. Using these time series, one can estimate frequency-band specific functional connectivity between ... More
Design of a Monopole Antenna Based Resonant Nanocavity for Detection of Optical Power from Hybrid Plasmonic WaveguidesDec 31 2013A novel plasmonic waveguide-coupled nanocavity with a monopole antenna is proposed to localize the optical power from a hybrid plasmonic waveguide and subsequently convert it into electrical current. The nanocavity is designed as a Fabry-P\'erot waveguide ... More
Waveguide engineering of graphene's nonlinearityNov 18 2014Graphene has recently been shown to possess giant nonlinearity; however, the utility of this nonlinearity is limited due to high losses and small interaction volume. We show that by performing waveguide engineering to graphene's nonlinearity, we are able ... More
Simulation studies of the behavior of positrons in a microtrap with long aspect ratioDec 31 2012Jul 09 2013The charged particles storage capacity of microtraps (micro-Penning-Malmberg traps) with large length to radius aspect ratios and radii of the order of tens of microns was explored. Simulation studies of the motions of charged particles were conducted ... More
Detection, size, measurement and structural analysis limits for the 2MASS, UKIDSS-LAS & VISTA VIKING surveysNov 07 2013The 2MASS, UKIDSS-LAS and VISTA VIKING surveys have all now observed the GAMA 9hr region in the $K_s$ band. Here we compare the detection rates, photometry, basic size measurements, and single-component GALFIT structural measurements for a sample of 37,591 ... More
Fidelity of bacterial translation initiation: a stochastic kinetic modelFeb 06 2018During the initiation stage of protein synthesis, a ribosomal initiation complex (IC) is assembled on a messenger RNA (mRNA) template. In bacteria, the speed and accuracy of this assembly process are regulated by the complementary activities of three ... More
Non-Parametric Cell-Based Photometric Proxies for Galaxy Morphology: Methodology and Application to the Morphologically-Defined Star Formation -- Stellar Mass Relation of Spiral Galaxies in the Local UniverseNov 19 2013(Abridged) We present a non-parametric cell-based method of selecting highly pure and largely complete samples of spiral galaxies using photometric and structural parameters as provided by standard photometric pipelines and simple shape fitting algorithms, ... More
On Using Monolingual Corpora in Neural Machine TranslationMar 11 2015Jun 12 2015Recent work on end-to-end neural network-based architectures for machine translation has shown promising results for En-Fr and En-De translation. Arguably, one of the major factors behind this success has been the availability of high quality parallel ... More
Evaluation of defects in cuprous oxide through exciton luminescence imagingDec 08 2014The various decay mechanisms of excitons in cuprous oxide (Cu2O) are highly sensitive to defects which can relax selection rules. Here we report cryogenic hyperspectral imaging of exciton luminescence from cuprous oxide crystals grown via the floating ... More
The statistical mechanics of complex signaling networks : nerve growth factor signalingJun 22 2004It is becoming increasingly appreciated that the signal transduction systems used by eukaryotic cells to achieve a variety of essential responses represent highly complex networks rather than simple linear pathways. While significant effort is being made ... More
Highly Efficient Midinfrared On-Chip Electrical Generation of Graphene Plasmons by Inelastic Electron Tunneling ExcitationAug 27 2015Inelastic electron tunneling provides a low-energy pathway for the excitation of surface plasmons and light emission. We theoretically investigate tunnel junctions based on metals and graphene. We show that graphene is potentially a highly efficient material ... More
Photon number statistics uncover the fluctuations in non-equilibrium lattice dynamicsJul 15 2015Jan 14 2016Fluctuations of the atomic positions are at the core of a large class of unusual material properties ranging from quantum para-electricity to high temperature superconductivity. Their measurement in solids is the subject of an intense scientific debate ... More
Efficiencies of Aloof-Scattered Electron Beam Excitation of Metal and Graphene PlasmonsJun 03 2015We assessed the efficiencies of surface plasmon excitation by an aloof-scattered electron beam on metals and graphene. Graphene is shown to exhibit high energy transfer efficiencies at very low electron kinetic energy requirements. We show that the exceptional ... More
Galaxy and Mass Assembly (GAMA): maximum likelihood determination of the luminosity function and its evolutionMay 05 2015We describe modifications to the joint stepwise maximum likelihood method of Cole (2011) in order to simultaneously fit the GAMA-II galaxy luminosity function (LF), corrected for radial density variations, and its evolution with redshift. The whole sample ... More
Exploring Relations Between BCG \& Cluster Properties in the SPectroscopic IDentification of eROSITA Sources Survey from $0.05 < z < 0.3$Apr 09 2018We present a sample of 329 low to intermediate redshift ($0.05 < z < 0.3$) brightest cluster galaxies (BCGs) in X-ray selected clusters from the SPectroscopic IDentification of eRosita Sources (SPIDERS) survey, a spectroscopic survey within Sloan Digital ... More
Reproducible $k$-means clustering in galaxy feature data from the GAMA surveyOct 01 2018A fundamental bimodality of galaxies in the local Universe is apparent in many of the features used to describe them. Multiple sub-populations exist within this framework, each representing galaxies following distinct evolutionary pathways. Accurately ... More
Galaxy and Mass Assembly (GAMA): merging galaxies and their propertiesJul 18 2014We derive the close pair fractions and volume merger rates as a function of luminosity and morphology for galaxies in the GAMA survey with -23 < M(r) < -17 at 0.01 < z < 0.22. The merger fraction is about 0.015 at all luminosities (assuming 1/2 of pairs ... More
Pulsed homodyne Gaussian quantum tomography with low detection efficiencyJan 11 2013Feb 19 2014Pulsed homodyne quantum tomography usually requires a high detection efficiency limiting its applicability in quantum optics. Here, it is shown that the presence of low detection efficiency ($<50\%$) does not prevent the tomographic reconstruction of ... More
Galaxy and Mass Assembly (GAMA): galaxy radial alignments in GAMA groupsJun 20 2013We constrain the distributions of projected radial alignment angles of satellite galaxy shapes within the Galaxy And Mass Assembly survey group catalogue. We identify the galaxy groups using spectroscopic redshifts and measure galaxy projected ellipticities ... More
The Andromeda Study: A Femto-Spacecraft Mission to Alpha CentauriAug 11 2017This paper discusses the physics, engineering and mission architecture relating to a gram-sized interstellar probe propelled by a laser beam. The objectives are to design a fly-by mission to Alpha Centauri with a total mission duration of 50 years travelling ... More
Submillimeter spectroscopy and astronomical searches of vinyl mercaptan, C$_2$H$_3$SHFeb 15 2019We have extended the pure rotational investigation of the two isomers syn and anti vinyl mercaptan to the millimeter domain using a frequency-multiplication spectrometer. The species were produced by a radiofrequency discharge in 1,2-ethanedithiol. Additional ... More
Galaxy And Mass Assembly (GAMA): detection of low-surface-brightness galaxies from SDSS dataSep 05 2016We report on a search for new low-surface-brightness galaxies (LSBGs) using Sloan Digital Sky Survey (SDSS) data within the GAMA equatorial fields. The search method consisted of masking objects detected with SDSS photo, combining gri images weighted ... More
Origin of Improved Photoelectrochemical Water Splitting in Mixed Perovskite OxidesSep 24 2018Owing to the versatility in their chemical and physical properties, transition metal perovskite oxides have emerged as a new category of highly efficient photocatalysts for photoelectrochemical water splitting. Here, to understand the underlying mechanism ... More
Galaxy Zoo: Secular evolution of barred galaxies from structural decomposition of multi-band imagesSep 29 2017Oct 05 2017We present the results of two-component (disc+bar) and three-component (disc+bar+bulge) multiwavelength 2D photometric decompositions of barred galaxies in five SDSS bands ($ugriz$). This sample of $\sim$3,500 nearby ($z<0.06$) galaxies with strong bars ... More
Galaxy And Mass Assembly (GAMA): The unimodal nature of the dwarf galaxy populationSep 25 2014In this paper we aim to (i) test the number of statistically distinct classes required to classify the local galaxy population, and, (ii) identify the differences in the physical and star formation properties of visually-distinct galaxies. To accomplish ... More
Galaxy And Mass Assembly: Estimating galaxy group masses via caustic analysisApr 02 2012We have generated complementary halo mass estimates for all groups in the Galaxy And Mass Assembly Galaxy Group Catalogue (GAMA G3Cv1) using a modified caustic mass estimation algorithm, originally developed by Diaferio & Geller (1997). We calibrate the ... More
Galaxy And Mass Assembly (GAMA): the wavelength dependence of galaxy structure versus redshift and luminositySep 22 2015Sep 28 2015We study how the sizes and radial profiles of galaxies vary with wavelength, by fitting Sersic functions simultaneously to imaging in nine optical and near-infrared bands. To quantify the wavelength dependence of effective radius we use the ratio, $\mathcal{R}$, ... More
Galaxy And Mass Assembly (GAMA): A deeper view of the mass, metallicity, and SFR relationshipsJun 07 2013A full appreciation of the role played by gas metallicity (Z), star-formation rate (SFR), and stellar mass is fundamental to understanding how galaxies form and evolve. The connections between these three parameters at different redshifts significantly ... More
Galaxy And Mass Assembly: Deconstructing Bimodality - I. Red ones and blue onesAug 26 2014We measure the mass functions for generically red and blue galaxies, using a z < 0.12 sample of log M* > 8.7 field galaxies from the Galaxy And Mass Assembly (GAMA) survey. Our motivation is that, as we show, the dominant uncertainty in existing measurements ... More
Galaxy And Mass Assembly (GAMA): The Life and Times of L* GalaxiesJan 30 2013In this work we investigate in detail the effects local environment (groups and pairs) has on galaxies with stellar mass similar to the Milky-Way (L* galaxies). A volume limited sample of 6,150 galaxies is classified to determine emission features, morphological ... More
Galaxy And Mass Assembly: the evolution of the cosmic spectral energy distribution from z = 1 to z = 0May 22 2017We present the evolution of the Cosmic Spectral Energy Distribution (CSED) from $z = 1 - 0$. Our CSEDs originate from stacking individual spectral energy distribution fits based on panchromatic photometry from the Galaxy and Mass Assembly (GAMA) and COSMOS ... More
Galaxy And Mass Assembly (GAMA): mass-size relations of z$<$0.1 galaxies subdivided by Sérsic index, colour and morphologyNov 24 2014We use data from the Galaxy And Mass Assembly (GAMA) survey in the redshift range 0.01$<$z$<$0.1 (8399 galaxies in $g$ to $K_s$ bands) to derive the stellar mass $-$ half-light radius relations for various divisions of 'early' and 'late'-type samples. ... More
Galaxy And Mass Assembly (GAMA): autoz spectral redshift measurements, confidence and errorsApr 09 2014The Galaxy And Mass Assembly (GAMA) survey has obtained spectra of over 230000 targets using the Anglo-Australian Telescope. To homogenise the redshift measurements and improve the reliability, a fully automatic redshift code was developed (autoz). The ... More
Galaxy And Mass Assembly (GAMA): The 325 MHz Radio Luminosity Function of AGN and Star Forming GalaxiesDec 31 2015Measurement of the evolution of both active galactic nuclei (AGN) and star-formation in galaxies underpins our understanding of galaxy evolution over cosmic time. Radio continuum observations can provide key information on these two processes, in particular ... More
Galaxy And Mass Assembly (GAMA): Bivariate functions of H$α$ star forming galaxiesNov 10 2014We present bivariate luminosity and stellar mass functions of H$\alpha$ star forming galaxies drawn from the Galaxy And Mass Assembly (GAMA) survey. While optically deep spectroscopic observations of GAMA over a wide sky area enable the detection of a ... More
Galaxy And Mass Assembly: Automatic Morphological Classification of Galaxies Using Statistical LearningNov 16 2017Nov 17 2017We apply four statistical learning methods to a sample of $7941$ galaxies ($z<0.06$) from the Galaxy and Mass Assembly (GAMA) survey to test the feasibility of using automated algorithms to classify galaxies. Using $10$ features measured for each galaxy ... More
Galaxy And Mass Assembly (GAMA): Understanding the wavelength dependence of galaxy structure with bulge-disc decompositionsMay 16 2016With a large sample of bright, low-redshift galaxies with optical$-$near-IR imaging from the GAMA survey we use bulge-disc decompositions to understand the wavelength-dependent behavior of single-S\'ersic structural measurements. We denote the variation ... More
Galaxy And Mass Assembly (GAMA): Refining the Local Galaxy Merger Rate using Morphological InformationSep 04 2014We use the Galaxy And Mass Assembly (GAMA) survey to measure the local Universe mass dependent merger fraction and merger rate using galaxy pairs and the CAS structural method, which identifies highly asymmetric merger candidate galaxies. Our goals are ... More
Galaxy And Mass Assembly (GAMA): the Stellar Mass Budget by Galaxy TypeDec 08 2015We report an expanded sample of visual morphological classifications from the Galaxy and Mass Assembly (GAMA) survey phase two, which now includes 7,556 objects (previously 3,727 in phase one). We define a local (z <0.06) sample and classify galaxies ... More
Galaxy And Mass Assembly (GAMA): the Stellar Mass Budget of Galaxy Spheroids and DisksAug 19 2016We build on a recent photometric decomposition analysis of 7506 Galaxy and Mass Assembly (GAMA) survey galaxies to derive stellar mass function fits to individual spheroid and disk component populations down to a lower mass limit of log(M_*/M_sun)= 8. ... More
H-ATLAS/GAMA and HeViCS - Dusty Early-Type Galaxies in Different EnvironmentsMay 26 2015The Herschel Space Observatory has had a tremendous impact on the study of extragalactic dust. Specifically, early-type galaxies (ETG) have been the focus of several studies. In this paper we combine results from two Herschel studies - a Virgo cluster ... More
Galaxy and Mass Assembly (GAMA): Fine filaments of galaxies detected within voidsJan 28 2014Based on data from the Galaxy and Mass Assembly (GAMA) survey, we report on the discovery of structures that we refer to as `tendrils' of galaxies: coherent, thin chains of galaxies that are rooted in filaments and terminate in neighbouring filaments ... More
The SAMI Galaxy Survey: Gas Streaming and Dynamical M/L in Rotationally Supported SystemsNov 17 2015Line-of-sight velocities of gas and stars can constrain dark matter (DM) within rotationally supported galaxies if they trace circular orbits extensively. Photometric asymmetries may signify non-circular motions, requiring spectra with dense spatial coverage. ... More
MegaMorph - multi-wavelength measurement of galaxy structure: complete Sérsic profile information from modern surveysDec 13 2012In this paper, we demonstrate a new method for fitting galaxy profiles which makes use of the full multi-wavelength data provided by modern large optical-near-infrared imaging surveys. We present a new version of GALAPAGOS, which utilises a recently-developed ... More
Galaxy And Mass Assembly (GAMA): The galaxy stellar mass function at z < 0.06Nov 24 2011Feb 14 2012We determine the low-redshift field galaxy stellar mass function (GSMF) using an area of 143 deg^2 from the first three years of the Galaxy And Mass Assembly (GAMA) survey. The magnitude limits of this redshift survey are r < 19.4 mag over two thirds ... More