Matthew Bayliss
A5023580610- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- SAS software applications and methods
- Radiomics and Machine Learning in Medical Imaging
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- CCD and CMOS Imaging Sensors
- Astro and Planetary Science
- History and Developments in Astronomy
- Grey System Theory Applications
- Pulsars and Gravitational Waves Research
- Genetics, Bioinformatics, and Biomedical Research
- Optical Systems and Laser Technology
- Calibration and Measurement Techniques
- Cryospheric studies and observations
- Cancer, Hypoxia, and Metabolism
- Solar and Space Plasma Dynamics
- Laser-induced spectroscopy and plasma
University of Cincinnati
2019-2025
Massachusetts Institute of Technology
2017-2024
Molecular Templates (United States)
2023
Kavli Institute for Particle Astrophysics and Cosmology
2009-2020
Harvard University Press
2013-2020
Fermi National Accelerator Laboratory
2018
Harvard University
2011-2017
Center for Astrophysics Harvard & Smithsonian
2011-2017
University of Chicago
2006-2017
Colby College
2015-2017
We present a catalog of galaxy clusters selected via their Sunyaev-Zel'dovich (SZ) effect signature from 2500 deg$^2$ South Pole Telescope (SPT) data. This work represents the complete sample detected at high significance in 2500-square-degree SPT-SZ survey, which was completed 2011. A total 677 (409) cluster candidates are identified above signal-to-noise threshold $\xi$ =4.5 (5.0). Ground- and space-based optical near-infrared (NIR) imaging confirms overdensities similarly colored galaxies...
Using the Atacama Large Millimeter/submillimeter Array, we have conducted a blind redshift survey in 3 mm atmospheric transmission window for 26 strongly lensed dusty star-forming galaxies (DSFGs) selected with South Pole Telescope. The sources were to S1.4 > 20 mJy and dust-like spectrum and, remove low-z sources, not bright radio (S843 MHz < 6 mJy) or far-infrared counterparts (S100 μm 1 Jy, S60 200 mJy). We robustly detect 44 line features our survey, which identify as redshifted emission...
(abridged) We present cosmological constraints obtained from galaxy clusters identified by their Sunyaev-Zel'dovich effect signature in the 2500 square degree South Pole Telescope Sunyaev Zel'dovich survey. consider 377 cluster candidates at z>0.25 with a detection significance greater than five, corresponding to 95% purity threshold for compute on models using measured abundance as function of mass and redshift. include additional multi-wavelength observations, including Chandra X-ray data...
We present a catalog of galaxy cluster candidates, selected through their Sunyaev–Zel'dovich (SZ) effect signature in the first 720 deg2 South Pole Telescope (SPT) survey. This area was mapped with SPT 2008 and 2009 austral winters to depth ∼18 μKCMB-arcmin at 150 GHz; 550 it also ∼44 95 GHz. Based on optical imaging all 224 candidates near-infrared majority we have found and/or infrared counterparts for 158, which then classify as confirmed clusters. Of these 158 clusters, 135 were...
We study the mass distribution of a sample 28 galaxy clusters using strong and weak lensing observations. The are selected via their properties as part Sloan Giant Arcs Survey (SGAS) from Digital Sky (SDSS). Mass modelling information giant arcs is combined with measurements deep Subaru/Suprime-cam images to primarily obtain robust constraints on concentration parameter shape distribution. find that cvir steep function mass, cvir∝M−0.59±0.12vir, value roughly consistent...
We use measurements from the South Pole Telescope (SPT) Sunyaev Zel'dovich (SZ) cluster survey in combination with X-ray to constrain cosmological parameters. present a statistical method that fits for scaling relations of SZ and observables mass while jointly fitting cosmology. The is generalizable multiple observables, self-consistently accounts effects selection uncertainties calibration on derived constraints. apply this data set consisting an SZ-selected catalog 18 galaxy clusters at z...
Abstract We measure the gas-phase abundances of elements He, N, O, Ne, S, Ar, and Fe in an individual H ii region known to be leaking Lyman-continuum photons Sunburst Arc, a highly magnified galaxy at redshift z = 2.37. detect temperature-sensitive auroral lines [S ] λλ 4070, 4076, [O iii λ 4363, 6314, 7320, 7330, [Ne 3343 stacked spectrum five multiple images emitter (LCE), from which we directly electron temperature low-, intermediate-, high-ionization zones. also density-sensitive...
We present first results on the cooling properties derived from Chandra X-ray observations of 83 high-redshift (0.3 < z 1.2) massive galaxy clusters selected by their Sunyaev–Zel'dovich signature in South Pole Telescope data. measure each cluster's central time, entropy, and mass deposition rate, compare these to those for local cluster samples. find no significant evolution ∼ 0 1 distribution properties, suggesting that cores is stable over long periods time. also average cool core entropy...
We present strong-lensing models, as well mass and magnification maps, for the cores of six HST Frontier Fields galaxy clusters. Our parametric lens models are constrained by locations redshifts multiple image systems lensed background galaxies. use a combination photometric spectroscopic sources obtained us (for Abell 2744 S1063), collected from literature, or kindly provided lensing community. Using our results, we (1) compare derived distribution each cluster to its light distribution,...
We present a velocity dispersion-based mass calibration of the South Pole Telescope Sunyaev-Zel'dovich effect survey (SPT-SZ) galaxy cluster sample. Using homogeneously selected sample 100 candidates from 720 deg2 along with 63 dispersion ($\sigma_v$) and 16 X-ray Yx measurements clusters, we simultaneously calibrate mass-observable relation constrain cosmological parameters. The calibrations using $\sigma_v$ are consistent at $0.6\sigma$ level, preferring ~16% higher masses. use full...
We derive cosmological constraints using a galaxy cluster sample selected from the 2500~deg$^2$ SPT-SZ survey. The spans redshift range $0.25< z<1.75$ and contains 343 clusters with SZ detection significance $\xi>5$. is supplemented optical weak gravitational lensing measurements of 32 $0.29<z<1.13$ (from Magellan HST) X-ray 89 $0.25<z<1.75$ Chandra). rely on minimal modeling assumptions: i) provides an accurate means measuring halo masses, ii) mean observables are related to true mass...
We infer the properties of massive star populations using far-ultraviolet stellar continua 61 star-forming galaxies: 42 at low-z observed with HST and 19 z~2 from Megasaura sample. fit each continuum a linear combination up to 50 single age metallicity Starburst99 models. From these fits, we derive light-weighted ages metallicities, which agree wind photospheric spectral features, shapes strengths ionizing continua. Inferred metallicities span 0.05-1.5 Z$_\odot$ are similar measured nebular...
We cross-match galaxy cluster candidates selected via their Sunyaev–Zel'dovich effect (SZE) signatures in 129.1 deg2 of the South Pole Telescope 2500d SPT-SZ survey with optically identified clusters from Dark Energy Survey science verification data. identify 25 between 0.1 ≲ z 0.8 union and redMaPPer (RM) samples. RM is an optical finding algorithm that also returns a richness estimate for each cluster. model λ-mass relation following function 〈ln λ|M500〉 ∝ Bλln M500 + Cλln E(z) use masses...
The fraction of ionizing photons that escape high-redshift galaxies sensitively determines whether reionized the early Universe. However, this cannot be measured from because opacity intergalactic medium is large at high redshifts. Without methods to measure indirectly, it unlikely we will know what Here, analyze far-ultraviolet (UV) H I (Lyman series) and low-ionization metal absorption lines nine low-redshift, confirmed Lyman continuum emitting galaxies. We use covering fractions, column...
We present the results of ground- and space-based optical near-infrared (NIR) follow-up 224 galaxy cluster candidates detected with Sunyaev-Zel'dovich (SZ) effect in 720 deg^2 South Pole Telescope (SPT) survey completed 2008 2009 observing seasons. use optical/NIR data to establish whether each candidate is associated an overdensity galaxies estimate redshift. Most photometric redshifts are derived through a combination three different redshift estimators using red-sequence galaxies,...
We present optical and near-IR imaging spectroscopy of SGAS J105039.6$+$001730, a strongly lensed galaxy at z $=$ 3.6252 magnified by $>$30$\times$, derive its physical properties. measure stellar mass log(M$_{*}$/M$_{\odot}$) 9.5 $\pm$ 0.35, star formation rates from [O II]$\lambda$$\lambda$3727 H-$\beta$ 55 20 84 17 M$_{\odot}$ yr$^{-1}$, respectively, an electron density n$_{e} \leq$ 10$^{3}$ cm$^{-2}$, temperature T$_{e} 14000 K, metallicity 12+log(O/H) 8.3 0.1. The strong C...
We present an HST/ACS weak gravitational lensing analysis of 13 massive high-redshift (z_median=0.88) galaxy clusters discovered in the South Pole Telescope (SPT) Sunyaev-Zel'dovich Survey. This study is part a larger campaign that aims to robustly calibrate mass-observable scaling relations over wide range redshift enable improved cosmological constraints from SPT cluster sample. introduce new strategies ensure systematics do not degrade on significantly. First, we efficiently remove...
We present rest-frame ultraviolet and optical spectroscopy of the brightest lensed galaxy yet discovered, at redshift z = 2.4. This source reveals a characteristic, triple-peaked Lyman {\alpha} profile which has been predicted by various theoretical works but to our knowledge not unambiguously observed previously. The feature is well fit superposition two components: double-peak emerging from substantial radiative transfer, narrow, central component resulting directly escaping photons;...
We estimate total mass (M500), intracluster medium (ICM) (MICM), and stellar (M⋆) in a Sunyaev–Zel'dovich effect (SZE) selected sample of 91 galaxy clusters with masses M500 ≳ 2.5 × 1014 M⊙ redshift 0.2 < z 1.25 from the 2500 |$\deg ^2$| South Pole Telescope SPT-SZ survey. The are estimatedfrom SZE observable, ICM MICM obtained analysis Chandra X-ray observations, M⋆ derived by fitting spectral energy distribution templates to Dark Energy Survey griz optical photometry WISE or Spitzer...
We derive new self-consistent theoretical UV, optical, and IR diagnostics for the ISM pressure electron density in ionized nebulae of star-forming galaxies. Our UV utilize inter-combination, forbidden resonance lines silicon, carbon, aluminum, neon, nitrogen. also calibrate optical oxygen, argon, nitrogen sulfur. show that line ratios used as depend on gas-phase metallicity with a residual dependence ionization parameter gas. In addition, traditional diagnostic [S II] λ6731/[S λ6717 is...
Uncertainty in mass–observable scaling relations is currently the limiting factor for galaxy-cluster-based cosmology. Weak gravitational lensing can provide direct mass calibration and reduce uncertainty. We present new ground-based weak observations of 19 South Pole Telescope (SPT) selected clusters at redshifts 0.29 ≤ |$z$| 0.61 combine them with previously reported space-based 13 galaxy 0.576 1.132 to constrain cluster Sunyaev–Zel'dovich effect (SZE), gas Mgas YX, product X-ray...
Far-ultraviolet (FUV; ~1200-2000 angstroms) spectra are fundamental to our understanding of star-forming galaxies, providing a unique window on massive stellar populations, chemical evolution, feedback processes, and reionization. The launch JWST will soon usher in new era, pushing the UV spectroscopic frontier higher redshifts than ever before, however, its success hinges comprehensive star populations gas conditions that power observed spectral features. This requires level detail is only...