D. T. Frayer
A5039015861- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Superconducting and THz Device Technology
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- History and Developments in Astronomy
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Molecular Spectroscopy and Structure
- Medical Imaging Techniques and Applications
- Advanced Thermodynamic Systems and Engines
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Atmospheric and Environmental Gas Dynamics
- Antenna Design and Optimization
National Radio Astronomy Observatory
2012-2024
TD Bank
2019-2023
Histoire Naturelle de l’Homme Préhistorique
2011-2013
California Institute of Technology
2001-2011
Infrared Processing and Analysis Center
2007-2010
Jet Propulsion Laboratory
2010
Pasadena City College
2009
Institut für Palliative Care
2008
Alltech (United States)
2005
Fleet Science Center
2004
Examining a sample of massive galaxies at 1.4<z<2.5 with K_{Vega}<22 from the Great Observatories Origins Deep Survey, we compare photometry Spitzer mid- and far-IR, to submillimeter, radio rest-frame ultraviolet wavelengths, test agreement between different tracers star formation rates (SFRs) explore implications for galaxy assembly. For z~2 moderate luminosities(L_{8um}<10^{11}L_sun), find that SFR can be estimated consistently multiwavelength data based on local luminosity correlations....
We present the deepest 100 to 500 μm far-infrared observations obtained with Herschel Space Observatory as part of GOODS-Herschel key program, and examine infrared (IR) 3–500 spectral energy distributions (SEDs) galaxies at 0 < z 2.5, supplemented by a local reference sample from IRAS, ISO, Spitzer, AKARI data. determine projected star formation densities their radio mid-IR continuum sizes.
Selection of active galactic nuclei (AGNs) in the infrared facilitates discovery AGNs whose optical emission is extinguished by dust.In this paper, we use Spitzer Space Telescope First Look Survey (FLS) to assess fraction with mid-infrared (MIR) luminosities that are comparable quasars and missed quasar surveys because dust obscuration.We begin using Sloan Digital Sky (SDSS) database identify 54 within 4 deg 2 extragalactic FLS.These occupy a distinct region MIR color space virtue their...
The Herschel ATLAS is the largest open-time key project that will be carried out on Space Observatory. It survey 510 square degrees of extragalactic sky, four times larger than all other surveys combined, in five far-infrared and submillimetre bands. We describe survey, complementary multi-wavelength datasets combined with data, six major science programmes we are undertaking. Using new models based a previous galaxies, present predictions properties sources wavebands.
Gravitational lensing is a powerful astrophysical and cosmological probe particularly valuable at submillimeter wavelengths for the study of statistical individual properties dusty starforming galaxies. However identification gravitational lenses often time-intensive, involving sifting large volumes imaging or spectroscopic data to find few candidates. We used early from Herschel Astrophysical Terahertz Large Area Survey demonstrate that wide-area surveys can simply easily detect strong...
The Great Observatories All-Sky LIRG Survey (GOALS20 ) combines data from NASA's Spitzer Space Telescope,Chandra X-Ray Observatory,Hubble Telescope (HST), and Galaxy Evolution Explorer (GALEX) observatories, together with ground-based data, into a comprehensive imaging spectroscopic survey of over 200 low-redshift (z < 0.088), Luminous Infrared Galaxies (LIRGs). LIRGs are complete subset the IRAS Revised Bright Sample (RBGS), which comprises 629 extragalactic objects 60 μm flux densities...
<i>Aims. <i/>We use the deepest existing mid- and far-infrared observations (reaching ~3 mJy at 70 <i>μ<i/>m) obtained with <i>Spitzer<i/> in Great Observatories Origins Deep Survey (GOODS) Far Infrared Extragalactic Legacy survey (FIDEL) fields to derive evolution of rest-frame 15 <i>μ<i/>m, 35 total infrared luminosity functions galaxies spanning . We thereby quantify fractional contribution luminous comoving star formation rate density over this redshift range. In comparison previous...
We present deep mid-infrared spectroscopy with the Spitzer Space Telescope of 13 submillimeter galaxies (SMGs) in Great Observatories Origins Deep Survey North (GOODS-N) field. find strong polycyclic aromatic hydrocarbon (PAH) emission all our targets which allows us to measure mid-IR spectroscopic redshifts and place constraints on contribution from star formation active galactic nuclei (AGN) activity emission. In high signal-to-noise ratio composite spectrum SMGs, we that hot dust...
We present SEDs, Spitzer colours, and IR luminosities for 850 micron selected galaxies in the GOODS-N field. Using deep Legacy images new data reductions of VLA-HDF radio data, we find statistically secure counterparts 60 per cent (21/35) our submm sample, identify tentative another 12 objects. This is largest sample with detected Spitzer. that most cases emission dominated by a single 24 source. A composite rest-frame SED shows sources peak at longer wavelengths than those local ULIRGs same...
We derive the evolution of infrared (IR) luminosity function (LF) over last 4/5ths cosmic time, using deep 24um and 70um imaging GOODS North South fields. use an extraction technique based on prior source positions at shorter wavelengths to build 24 catalogs. The majority (93%) sources have a spectroscopic (39%) or photometric redshift (54%) and, in our range interest (i.e., 1.3<z<2.3) ~20% redshifts. To extend study lower luminosities we perform stacking analysis characterize observed...
We present the first results of a survey [CII]158um emission line in 241 luminous infrared galaxies (LIRGs) comprising Great Observatories All-sky Survey (GOALS) sample, obtained with PACS instrument on board Herschel. The [CII] luminosities LIRGs GOALS range from ~10^7 to 2x10^9 Lsun. find that show tight correlation [CII]/FIR far-IR flux density ratios, strong negative trend spanning ~10^-2 10^-4, as average temperature dust increases. correlations between ratio and strength 9.7um silicate...
Using the Spitzer Space Telescope and Very Large Array (VLA), we present first direct evidence that well-known far-infrared/radio correlation is valid to cosmologically significant redshift. We also confirm, with improved statistics compared previous surveys, a similar result for mid-IR/radio correlation. explore dependence of monochromatic q24 q70 on z. The results were obtained by matching sources at 24 70 μm VLA 1.4 GHz microjansky radio First Look Survey (FLS). Spectroscopic redshifts...
Approximately 20%-30% of 1.4 ≲ z 2.5 galaxies with KVega < 22 detected Spitzer MIPS at 24 μm show excess mid-IR emission relative to that expected based on the rates star formation measured from other multiwavelength data. These also display some near-IR in IRAC data, an SED peaking longward 1.6 rest frame, indicating presence warm dust usually absent star-forming galaxies. Stacking Chandra data for yields a significant hard X-ray detection rest-frame energies >6.2 keV. The stacked spectrum...
The Spitzer Space Telescope was used to study the mid-infrared far-infrared properties of NGC 300, and compare dust emission Halpha elucidate heating ISM star formation cycle at scales < 100 pc. new data allow us discern clear differences in spatial distribution 8 micron with respect 24 HII regions traced by light. highlights rims regions, is more strongly peaked forming than microns. We confirm existence approximate amplitude interstellar 4.5 microns, detected statistically Infrared...
We report the detection of CO (3→2) emission from submillimeter-selected hyperluminous galaxy SMM 02399-0136. This is brightest source detected in recent Submillimeter Common-User Bolometer Array surveys submillimeter sky. The optical counterpart has been identified as a narrow-line active galactic nucleus/starburst at z=2.8. unresolved, θ≲5'', and coincident redshift position with counterpart. molecular gas mass derived observations 8×1010 h−275 M, after correcting for lensing amplification...
We report IRAM millimeter interferometry of three z ~ 2.4-3.4 Submillimeter Common-User Bolometric Array deep field galaxies. Our CO line observations confirm the rest-frame UV/optical redshifts, thus more than doubling number confirmed published redshifts faint submillimeter population and proving their high-z nature. In all sources our measurements intrinsic gas dynamical mass are large (1010-1011 M☉). at least two cases data show that part an interacting system. Together with recent...
We report ground-based follow-up observations of the exceptional source, ID141, one brightest sources detected so far in H-ATLAS cosmological survey. ID141 was observed using IRAM 30-meter telescope and Plateau de Bure interferometer (PdBI), Submillimeter Array (SMA) Atacama Pathfinder Experiment (APEX) submillimeter to measure dust continuum emission lines main isotope carbon monoxide ([C I] [C II]). The detection strong CO with PdBI confirms that is at high redshift (z=4.243 +/- 0.001)....
We present a statistical analysis of the mid-infrared (MIR) spectra 248 luminous infrared (IR) galaxies (LIRGs) which comprise Great Observatories All-sky LIRG Survey (GOALS) observed with Infrared Spectrograph (IRS) on-board Spitzer Space Telescope. The GOALS sample enables direct measurement relative contributions star-formation and active galactic nuclei (AGN) to total IR emission from large local LIRGs. AGN contribution MIR (f-AGN) is estimated by employing several diagnostics based on...
We present the mid-infrared spectra obtained with Spitzer IRS for 52 sources, selected as infrared luminous, z ≳ 1 candidates in Extragalactic First Look Survey. The sample selection criteria are f24 μm 0.9 mJy, νfν(24 μm)/νfν(8 μm) 3.16, and μm)/νfν(0.7 10. Of spectra, 47 (90%) produced measurable redshifts based solely on mid-IR spectral features, 35/47 (74%) at 1.5 ≲ 3.2. Keck spectroscopy of a subsample (17/47) agrees redshift measurements. observed fall into three categories: (1) 33%...
UV continuum and mid-IR emission constitute two widely used star formation indicators at intermediate high redshifts. We study 2430 galaxies with z<1.4 in the Extended Groth Strip MIPS 24 mic observations from FIDEL, spectroscopy DEEP2, UV, optical, near-IR photometry AEGIS. The data are coupled stellar population models Bayesian SED fitting to estimate dust-corrected SFRs. In order probe dust heating populations of various ages, derived SFRs were averaged over timescales--from 100 Myr...
We investigate the correlation between far-infrared (FIR) and radio luminosities in distant galaxies, a lynchpin of modern astronomy. use data from Balloon-borne Large Aperture Submillimetre Telescope (BLAST), Spitzer, Apex BOlometer CamerA (LABOCA), Very Array (VLA) Giant Metre-wave Radio (GMRT) Extended Chandra Deep Field South (ECDFS). For catalogue BLAST 250-micron-selected we re-measure 70--870-micron flux densities at positions their most likely 24-micron counterparts, which have...
The Great Observatories All-sky LIRG Survey (GOALS) consists of a complete sample 202 luminous infrared galaxies (LIRGs) selected from the IRAS Revised Bright Galaxy Sample (RBGS). span full range interaction stages, isolated to interacting pairs late stage mergers. We present comparison UV and properties 135 in GOALS observed by GALEX Spitzer. For with separations greater than resolution Spitzer (∼2''–6''), we assess IR each galaxy individually. contribution FUV measured star formation rate...
We report measurements of the carbon monoxide ground state rotational transition (12C16O J = 1--0) with Zpectrometer ultra-wideband spectrometer on 100-m diameter Green Bank Telescope. The sample comprises 11 galaxies redshifts between z 2.1 and 3.5 from a total 24 targets identified by Herschel-ATLAS photometric colors SPIRE instrument. Nine CO are new redshift determinations, substantially adding to number detections rest-frame peak submillimeter emission near 100um. confirm existence...
We present a list of 13 candidate gravitationally lensed submillimeter galaxies (SMGs) from 95 deg2 the Herschel Multi-tiered Extragalactic Survey, surface density 0.14 ± 0.04 deg−2. The selected sources have 500 μm flux densities (S500) greater than 100 mJy. Gravitational lensing is confirmed by follow-up observations in 9 systems (70%), and status four remaining undetermined. also supplementary sample 29 (0.31 0.06 deg−2) SMG candidates with S500 = 80–100 mJy, which are expected to contain...