A5018349918- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Astro and Planetary Science
- Differential Equations and Numerical Methods
- Phase Equilibria and Thermodynamics
- Spectroscopy and Chemometric Analyses
- Atmospheric Ozone and Climate
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Material Science and Thermodynamics
- History and Developments in Astronomy
- Solar and Space Plasma Dynamics
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Calibration and Measurement Techniques
- Statistical and numerical algorithms
Center for Astrophysics Harvard & Smithsonian
2020-2023
University of California, Irvine
2018-2020
University of Florida
2013-2020
Northeastern University
2011
The South Pole Telescope has discovered one hundred gravitationally lensed, high-redshift, dusty, star-forming galaxies (DSFGs). We present 0.5" resolution 870um Atacama Large Millimeter/submillimeter Array imaging of a sample 47 DSFGs spanning z=1.9-5.7, and construct gravitational lens models these sources. Our visibility-based modeling incorporates several sources residual interferometric calibration uncertainty, allowing us to properly account for noise in the observations. At least 70%...
Using the Australia Telescope Compact Array (ATCA), we conducted a survey of CO J=1-0 and J=2-1 line emission towards strongly lensed high-redshift dusty star forming galaxies (DSFGs) previously discovered with South Pole (SPT). Our sample comprises 17 sources that had CO-based spectroscopic redshifts obtained Atacama Large Millimeter/submillimeter (ALMA) Pathfinder Experiment (APEX). We detect all known in either or J=2-1. Twelve are detected 7-mm continuum. The derived luminosities imply...
We present [CII] observations of 20 strongly lensed dusty star forming galaxies at 2.1 < z 5.7 using APEX and Herschel. The sources were selected on their 1.4 mm flux (S_1.4mm > mJy) from the South Pole Telescope survey, with far-infrared (FIR) luminosities determined extensive photometric data. line is robustly detected in 17 sources, all but one being spectrally resolved. Eleven out observed also have low-J CO detections ATCA. A comparison mid- high-J lines ALMA reveals consistent velocity...
We use the Atacama Large Millimeter/submillimeter Array (ALMA) in Cycle 1 to determine spectroscopic redshifts of high-redshift dusty star-forming galaxies (DSFGs) selected by their 1.4mm continuum emission South Pole Telescope (SPT) survey. present ALMA 3mm spectral scans between 84-114GHz for 15 and targeted 1mm observations an additional eight sources. Our yield 30 new line detections from CO, [CI] , [NII] H_2O NH_3. further APEX [CII] CO mid-J seven sources which only a single was...
We report the discovery and constrain physical conditions of interstellar medium highest-redshift millimeter-selected dusty star-forming galaxy (DSFG) to date, SPT-S J031132-5823.4 (hereafter SPT0311-58), at $z=6.900 +/- 0.002$. SPT0311-58 was discovered via its 1.4mm thermal dust continuum emission in South Pole Telescope (SPT)-SZ survey. The spectroscopic redshift determined through an ALMA 3mm frequency scan that detected CO(6-5), CO(7-6) [CI](2-1), subsequently confirmed by detections...
We present the average rest-frame spectrum of high-redshift dusty, star-forming galaxies from 250-770GHz. This was constructed by stacking ALMA 3mm spectra 22 such sources discovered South Pole Telescope and spanning z=2.0-5.7. In addition to multiple bright spectral features 12CO, [CI], H2O, we also detect several faint transitions 13CO, HCN, HNC, HCO+, CN, use observed line strengths characterize typical properties interstellar medium these starburst galaxies. find that 13CO brightness in...
We present Atacama Large Millimeter Array [C i](1 − 0) (rest frequency 492 GHz) observations for a sample of 13 strongly lensed dusty star-forming galaxies (DSFGs) originally discovered at 1.4 mm in blank-field survey by the South Pole Telescope (SPT). compare these new data with available i] from literature, allowing study interstellar medium (ISM) properties ∼30 extreme DSFGs spanning redshift range 2 < z 5. Using line as tracer molecular ISM, we find mean gas mass SPT-DSFGs 6.6 × 1010 M⊙....
Galaxies grow inefficiently, with only a few percent of the available gas converted into stars each free-fall time. Feedback processes, such as outflowing winds driven by radiation pressure, supernovae or supermassive black hole accretion, can act to halt star formation if they heat expel supply. We report molecular outflow launched from dust-rich star-forming galaxy at redshift 5.3, one billion years after Big Bang. The reaches velocities up 800 km/s relative galaxy, is resolved multiple...
We present spatially resolved imaging obtained with the Australia Telescope Compact Array (ATCA) of three CO lines in two high-redshift gravitationally lensed dusty star-forming galaxies, discovered by South Pole Telescope. Strong lensing allows us to probe structure and dynamics molecular gas these objects, at z = 2.78 5.66, effective source-plane resolution less than 1 kpc. model emission from multiple transitions dust continuum a consistent manner, finding that cold as traced low-J always...
We present observations of SPT-S J053816-5030.8, a gravitationally-lensed dusty star forming galaxy (DSFG) at z = 2.7817, first discovered millimeter wavelengths by the South Pole Telescope. SPT 0538-50 is typical brightest sources found wide-field millimeter-wavelength surveys, being lensed an intervening moderate redshift (in this instance, 0.441). wide array multi-wavelength spectroscopic and photometric data on 0538-50, including from ALMA, Herschel PACS SPIRE, Hubble, Spitzer, VLT,...
We report the detection of a strong Milky Way-type 2175 \AA$ $ extinction bump at $z$ = 2.1166 in quasar spectrum towards SDSS J121143.42+083349.7 from Sloan Digital Sky Survey (SDSS) Data Release 10. conduct follow up observations with Echelle Spectrograph and Imager (ESI) onboard Keck-II telescope Ultraviolet Visual (UVES) on VLT. This absorber is remarkable that we simultaneously detect neutral carbon (C I), chlorine (Cl monoxide (CO). It also qualifies as damped Lyman alpha system. The...
To understand cosmic mass assembly in the universe at early epochs, we primarily rely on measurements of stellar masses and star formation rates (SFRs) distant galaxies. In this paper, present SFRs six high-redshift (2.8 ≤ z 5.7) dusty, star-forming galaxies (DSFGs) that are strongly gravitationally lensed by foreground These sources were first discovered South Pole Telescope (SPT) millimeter wavelengths all have spectroscopic redshifts robust lens models derived from Atacama Large...
Aims: We present and study spatially resolved imaging obtained with the Atacama Large Millimeter/submillimeter Array (ALMA) of multiple $^{12}$CO($J=$6$-$5, 8$-$7 9$-$8) two H$_2$O(2$_{02}-$1$_{11}$ 2$_{11}-$2$_{02}$) emission lines cold dust continuum toward gravitationally lensed dusty star forming galaxy SPT0346-52 at z=$5.656$. Methods: Using a visibility-domain source-plane reconstruction we probe structure dynamics different components interstellar medium (ISM) in this down to scales 1...
We present ALMA detections of the [NII] 205$\mu$m and CO(12-11) emission lines, tentative detection [CI] $^3$P$_1$ - $^3$P$_0$ for strongly lensed ($\mu$=5.7$\pm$0.5) dusty, star-forming galaxy SPT-S J213242-5802.9 (hereafter SPT2132-58) at z=4.77. The lines are detected 11.5 8.5 $\sigma$ level, respectively, by our band-6 observations. line is 3.2 after a re-analysis existing band-3 data. luminosity implies gas mass 3.8$\pm$1.2$\times$10$^{10}$ M$_\odot$, consequently very short depletion...
ABSTRACT We present Chandra ACIS-S and Australia Telescope Compact Array (ATCA) radio continuum observations of the strongly lensed dusty, star-forming galaxy SPT-S J034640-5204.9 (hereafter SPT0346-52) at z = 5.656. This has also been observed with ALMA, HST , Spitzer Herschel Atacama Pathfinder EXperiment, Very Large Telescope. Previous indicate that if infrared (IR) emission is driven by star formation, then inferred lensing-corrected formation rate (SFR) (∼4500 M ☉ yr −1 ) SFR surface...
SPT0346-52 is one of the most luminous and intensely star-forming galaxies in universe, with L_FIR > 10^13 L_sol Sigma_SFR ~ 4200 M_sol yr^-1 kpc^-2. In this paper, we present ~0.15'' ALMA observations [CII]158micron emission line z=5.7 dusty galaxy. We use a pixellated lensing reconstruction code to spatially kinematically resolve source-plane [CII] rest-frame 158 micron dust continuum structure at ~700 pc (~0.12'') resolution. discuss deficit study L_[CII]/L_FIR ratio source plane. find...
Abstract The recent Chandra discovery of extended ∼kiloparsec-scale hard (>3 keV) X-ray emission in nearby Compton-thick (CT) active galactic nuclei (AGN) opens a new window to improving AGN torus modeling and investigating how the central supermassive black hole interacts with impacts host galaxy. Since there are only handful detections so far, we need establish statistical sample determine ubiquity CT quantify amount extent this component. In paper, present spatial analysis results...
ABSTRACT We present SCUBA-2 850 $\mathrm{ \mu}$m observations of 13 candidate starbursting protoclusters selected using Planck and Herschel data. The cumulative number counts the sources in 9 these show significant overdensities compared to field, with probability &lt;10−2 assuming are randomly distributed sky. Using 250, 350, 500, flux densities, we estimate photometric redshifts individual by fitting spectral energy distribution templates an MCMC method. redshift distribution, peaking...
Abstract We present the spatial analysis of five Compton thick (CT) active galactic nuclei (AGNs), including MKN 573, NGC 1386, 3393, 5643, and 7212, for which high-resolution Chandra observations are available. For each source, we find hard X-ray emission (>3 keV) extending to ∼kiloparsec scales along ionization cone, some sources, in cross-cone region. This collection represents first, high-signal sample CT AGN with extended can begin build a more complete picture this new population...
We probe star formation in the environments of massive (∼1013 M⊙) dark matter haloes at redshifts z ∼ 1. This is linked to a submillimetre clustering signal which we detect maps Planck High Frequency Instrument that are stacked positions sample high redshift (z > 2) strongly lensed dusty star-forming galaxies (DSFGs) selected from South Pole Telescope (SPT) 2500 deg2 survey. The has colours consistent with mean foreground lensing 1). report excess rate (SFR) compared field, (2700 ± 700) M⊙...