Physical Sciences and Mathematics Commons^™

Uncover: Jwst Spectroscopy Of Three Cold Brown Dwarfs At Kiloparsec-Scale Distances, Sam E. Cutler, Et. Al.

Astronomy Department Faculty Publication Series

We report JWST/NIRSpec spectra of three distant T-type brown dwarfs identified in the Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization (UNCOVER) survey of the Abell 2744 lensing field. One source was previously reported as a candidate T dwarf on the basis of NIRCam photometry, while two sources were initially identified as candidate active galactic nuclei. Low-resolution 1–5 μm spectra confirm the presence of molecular features consistent with T dwarf atmospheres, and comparison to spectral standards infers classifications of sdT1, T6, and T8–T9. The warmest source, UNCOVER-BD-1, shows evidence of subsolar metallicity, and atmosphere model fits indicate …

X-Ray Detection Of The Most Extreme Star-Forming Galaxies At The Cosmic Noon Via Strong Lensing, Q Daniel Wang, Carlos Garcia Diaz, Min S. Yun, Et. Al.

Astronomy Department Faculty Publication Series

Hyperluminous infrared galaxies (HyLIRGs) are the most extreme star-forming systems observed in the early Universe, and their properties still elude comprehensive understanding. We have undertaken a large XMM–Newton observing programme to probe the total accreting black hole population in three HyLIRGs at z = 2.12, 3.25, and 3.55, gravitationally lensed by foreground galaxies. Selected from the Planck All-Sky Survey to Analyse Gravitationally lensed Extreme Starbursts (PASSAGES), these HyLIRGs have apparent infrared luminosities >1014 L_⊙. Our observations revealed X-ray emission in each of them. PJ1336+49 appears to be dominated by high-mass X-ray binaries (HMXBs). Remarkably, the luminosity …

Alma-Legus. Ii. The Influence Of Subgalactic Environments On Molecular Cloud Properties, Daniela Calzetti, Et. Al.

Astronomy Department Faculty Publication Series

We compare the molecular cloud properties in subgalactic regions of two galaxies, barred spiral NGC 1313, which is forming many massive clusters, and flocculent spiral NGC 7793, which is forming significantly fewer massive clusters despite having a similar star formation rate to NGC 1313. We find that there are larger variations in cloud properties between different regions within each galaxy than there are between the galaxies on a global scale, especially for NGC 1313. There are higher masses, line widths, pressures, and virial parameters in the arms of NGC 1313 and the center of NGC 7793 than in the interarm …

Uncover Spectroscopy Confirms The Surprising Ubiquity Of Active Galactic Nuclei In Red Sources At Z > 5, Sam E. Cutler, John R. Weaver, Katherine E. Whitaker, Et. Al.

Astronomy Department Faculty Publication Series

The James Webb Space Telescope is revealing a new population of dust-reddened broad-line active galactic nuclei (AGN) at redshifts z ≳ 5. Here we present deep NIRSpec/Prism spectroscopy from the Cycle 1 Treasury program Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization (UNCOVER) of 15 AGN candidates selected to be compact, with red continua in the rest-frame optical but with blue slopes in the UV. From NIRCam photometry alone, they could have been dominated by dusty star formation or an AGN. Here we show that the majority of the compact red sources in UNCOVER are dust-reddened AGN: 60% …

Hsc-Clauds Survey: The Star Formation Rate Functions Since Z  ∼  2 And Comparison With Hydrodynamical Simulations, V. Picouet, S. Arnouts, E. Le Floc'h, T. Mountard, K. Kraljic, O. Illbert, M. Sawicki, G. Desprez, C. Laigle, D. Schiminovich, S. De La Torre, S. Gwyn, H. J. Mccracken, Y. Dobois, R. Davé, S. Toft, J. R. Weaver, M. Shuntov, O. B. Kauffmann

Astronomy Department Faculty Publication Series

Context. Star formation rate functions (SFRFs) give an instantaneous view of the distribution of star formation rates (SFRs) in galaxies at different epochs. They are a complementary and more stringent test for models than the galaxy stellar mass function, which gives an integrated view of the past star formation activity. However, the exploration of SFRFs has been limited thus far due to difficulties in assessing the SFR from observed quantities and probing the SFRF over a wide range of SFRs.

Aims. We overcome these limitations thanks to an original method that predicts the infrared luminosity from the rest-frame UV/optical color …

Rapid Quenching Of Galaxies At Cosmic Noon, Minjung Park, Sirio Belli, Charlie Conroy, Sandro Tacchella, Joel Leja, Sam E. Cutler, Benjamin D. Johnson, Erica J. Nelson, Razieh Emami

Astronomy Department Faculty Publication Series

The existence of massive quiescent galaxies at high redshift seems to require rapid quenching, but it is unclear whether all quiescent galaxies have gone through this phase and what physical mechanisms are involved. To study rapid quenching, we use rest-frame colors to select 12 young quiescent galaxies at z ∼ 1.5. From spectral energy distribution fitting, we find that they all experienced intense starbursts prior to rapid quenching. We confirm this with deep Magellan/FIRE spectroscopic observations for a subset of seven galaxies. Broad emission lines are detected for two galaxies, and are most likely caused by active galactic nucleus (AGN) …

A Milky Way-Like Barred Spiral Galaxy At A Redshift Of 3, Yingjie Cheng, Mauro Giavalisco, Et. Al.

Astronomy Department Faculty Publication Series

The majority of massive disk galaxies in the local Universe show a stellar barred structure in their central regions, including our Milky Way. Bars are supposed to develop in dynamically cold stellar disks at low redshift, as the strong gas turbulence typical of disk galaxies at high redshift suppresses or delays bar formation. Moreover, simulations predict bars to be almost absent beyond z = 1.5 in the progenitors of Milky Way-like galaxies. Here we report observations of ceers-2112, a barred spiral galaxy at redshift zphot ≈ 3, which was already mature when the Universe was only 2 Gyr old. The …

Dynamical Hotness, Star Formation Quenching, And Growth Of Supermassive Black Holes, Hui Hong, Huiyuan Wang, H. J. Mo, Ziwen Zhang, Guangwen Chen, Wentao Luo, Tinggui Wang, Pengfei Li, Yao Yao, Aoxiang Jiang

Astronomy Department Faculty Publication Series

A stellar system is dynamically hot when its kinetic energy is dominated by random motion represented by the velocity dispersion σhot. We use MaNGA data to obtain the inner and outer dispersion of a galaxy, σin and σout, to characterize its dynamical status and study its connection with star formation quenching and the growth of its supermassive black hole (SMBH). We divide galaxies into fully quenched (FQGs), partially quenched (PQGs), and fully star-forming (FSGs) populations, and identify quenched central cores (QCCs) in PQGs. The galaxy distribution in (σin/σhot)–(σout/σhot) diagram …

Introducing The Texas Euclid Survey For Lyα (Tesla) Survey: Initial Study Correlating Galaxy Properties To Lyα Emission, John R. Weaver, Et. Al.

Astronomy Department Faculty Publication Series

We present the Texas Euclid Survey for Lyα (TESLA), a spectroscopic survey in the 10 deg2 of the Euclid North Ecliptic Pole (NEP) field. Using TESLA, we study how the physical properties of Lyα emitters (LAEs) correlate with Lyα emission to understand the escape of Lyα emission from galaxies at redshifts of 2–3.5. We present an analysis of 43 LAEs performed in the NEP field using early data from the TESLA survey. We use Subaru Hyper Suprime-Cam imaging in the grizy bands, Spitzer/IRAC channels 1 and 2 from the Hawaii 20 deg2 (H20) survey, and spectra …

The Jwst Pearls View Of The El Gordo Galaxy Cluster And Of The Structure It Magnifies, Carlos Diaz, Daniel Wang, Et. Al.

Astronomy Department Faculty Publication Series

The massive galaxy cluster El Gordo (z = 0.87) imprints multitudes of gravitationally lensed arcs onto James Webb Space Telescope Near-Infrared Camera (NIRCam) images. Eight bands of NIRCam imaging were obtained in the "Prime Extragalactic Areas for Reionization and Lensing Science" ("PEARLS") program. Point-spread function–matched photometry across Hubble Space Telescope and NIRCam filters supplies new photometric redshifts. A new light-traces-mass lens model based on 56 image multiplicities identifies the two mass peaks and yields a mass estimate within 500 kpc of (7.0 ± 0.30) × 1014M⊙. A search for substructure in the 140 cluster members with spectroscopic …

Near-Infrared Emission Line Diagnostics For Agn From The Local Universe To Z ∼ 3*, Mauro Giavalisco, Et. Al.

Astronomy Department Faculty Publication Series

Optical rest-frame spectroscopic diagnostics are usually employed to distinguish between star formation and active galactic nucleus (AGN) powered emission. However, this method is biased against dusty sources, hampering a complete census of the AGN population across cosmic epochs. To mitigate this effect, it is crucial to observe at longer wavelengths in the rest-frame near-infrared (near-IR), which is less affected by dust attenuation and can thus provide a better description of the intrinsic properties of galaxies. AGN diagnostics in this regime have not been fully exploited so far, due to the scarcity of near-IR observations of both AGN and star-forming galaxies, …

Uncover: Illuminating The Early Universe—Jwst/Nirspec Confirmation Of Z > 12 Galaxies, Sam E. Cutler, John R. Weaver, Katherine E. Whitaker, Et. Al.

Astronomy Department Faculty Publication Series

Observations of high-redshift galaxies provide a critical direct test to the theories of early galaxy formation, yet to date, only three have been spectroscopically confirmed at z > 12. Due to strong gravitational lensing over a wide area, the galaxy cluster field A2744 is ideal for searching for the earliest galaxies. Here we present JWST/NIRSpec observations of two galaxies: a robust detection at zspec 12.393 0.001 0.004 = - + , and a plausible candidate at zspec 13.079 0.001 0.013 = - + . The galaxies are discovered in JWST/NIRCam imaging and their distances are inferred with JWST/NIRSpec spectroscopy, all from …

Unveiling The Nature Of Infrared Bright, Optically Dark Galaxies With Early Jwst Data, L Barrufet, P A. Oesch, A Weibel, G Brammer, R Bezanson, R Bouwens, Y Fudamoto, V Gonzalez, R Gottumkkala, G Illingworth, K E. Heintz, B Holden, I Labbe, D Magee, R P. Naidu, E Nelson, M Stefanon, R Smit, P Van Dokkum, J R. Weaver, C C. Williams

Astronomy Department Faculty Publication Series

Over the last few years, both Atacama Large Millimeter/submillimeter Array (ALMA) and Spitzer observations have revealed a population of likely massive galaxies at z > 3 that was too faint to be detected inHubble Space Telescope(HST) rest-frame ultraviolet imaging. However, due to the very limited photometry for individual galaxies, the true nature of these so-called HST-dark galaxies has remained elusive. Here, we present the first sample of such galaxies observed with very deep, high-resolution NIRCam imaging from the Early Release Science programme CEERS. 30 HST-dark sources are selected based on their red colours across 1.6–4.4 …

An Xmm-Newton View Of The Andromeda Galaxy As Explored In A Legacy Survey (New-Angels). I. The X-Ray Source Catalog, Q. Daniel Wang, Et. Al.

Astronomy Department Faculty Publication Series

We introduce the New-ANGELS program, an XMM-Newton survey of a ∼7.2 deg2 area around M31, which aims to study the X-ray populations in the M31 disk and the X-ray-emitting hot gas in the inner halo of M31 up to 30 kpc. In this first paper, we report the catalog of 4506 detected X-ray sources and attempt to cross-identify or roughly classify them. We identify 352 single stars in the foreground, 35 globular clusters, and 27 supernova remnants associated with M31, as well as 62 active galactic nuclei, 59 galaxies, and one galaxy cluster in the background. We uniquely classify 236 …

Universal Upper End Of The Stellar Initial Mass Function In The Young And Compact Legus Clusters, Dooseok Escher Jung, Daniela Calzetti, Matteo Messa, Mark Heyer, Mattia Sirressi, Sean T. Linden, Et. Al.

Astronomy Department Faculty Publication Series

We investigate the variation in the upper end of the stellar initial mass function (uIMF) in 375 young and compact star clusters in five nearby galaxies within ∼5 Mpc. All the young stellar clusters (YSCs) in the sample have ages ≲ 4 Myr and masses above 500 M⊙, according to standard stellar models. The YSC catalogs were produced from Hubble Space Telescope images obtained as part of the Legacy ExtraGalactic UV Survey (LEGUS) Hubble treasury program. They are used here to test whether the uIMF is universal or changes as a function of the cluster's stellar mass. We perform …

The Spitzer–Hetdex Exploratory Large-Area Survey. Iv. Model-Based Multiwavelength Photometric Catalog, John R. Weaver, Et. Al.

Astronomy Department Faculty Publication Series

We present a 0.3–4.5 μm 16-band photometric catalog for the Spitzer/HETDEX Exploratory Large-Area (SHELA) survey. SHELA covers an ∼27 deg2 field within the footprint of the Hobby–Eberly Telescope Dark Energy Experiment (HETDEX). Here we present new DECam imaging and an rizKs band–selected catalog of four million sources extracted using a fully model-based approach. We validate our photometry by comparing with the model-based DECam Legacy Survey. We analyze the differences between model-based and aperture photometry by comparing with the previous SHELA catalog, finding that our model-based photometry can measure point sources to fainter fluxes and better capture the full …

Nebular C Ivλ1550 Imaging Of The Metal-Poor Starburst Mrk 71: Direct Evidence Of Catastrophic Cooling, Daniela Calzetti, Et. Al.

Astronomy Department Faculty Publication Series

We use the Hubble Space Telescope Advanced Camera for Surveys to obtain the first spatially resolved, nebular imaging in the light of C IV λλ1548, 1551 by using the F150LP and F165LP filters. These observations of the local starburst Mrk 71 in NGC 2366 show emission apparently originating within the interior cavity around the dominant super star cluster (SSC), Knot A. Together with imaging in He II λ4686 and supporting Space Telescope Imaging Spectrograph far-ultraviolet spectroscopy, the morphology and intensity of the C IV nebular surface brightness and the C IV/He II ratio map provide direct evidence that the mechanical …

The Diurnal Variation In Stratospheric Ozone From Macc Reanalysis, Era-Interim, Waccm, And Earth Observation Data: Characteristics And Intercomparison, Ansgar Schanz, Klemens Hocke, Niklaus Kämpfer, Simon Chabrillat, Antje Inness, Mathias Palm, Justus Notholt, Ian Boyd, Alan Parrish, Yasuko Kasai

Astronomy Department Faculty Publication Series

In this study, we compare the diurnal variation in stratospheric ozone of the MACC (Monitoring Atmospheric Composition and Climate) reanalysis, ECMWF Reanalysis Interim (ERA-Interim), and the free-running WACCM (Whole Atmosphere Community Climate Model). The diurnal variation of stratospheric ozone results from photochemical and dynamical processes depending on altitude, latitude, and season. MACC reanalysis and WACCM use similar chemistry modules and calculate a similar diurnal cycle in ozone when it is caused by a photochemical variation. The results of the two model systems are confirmed by observations of the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) experiment and three selected sites of the …

Xxi. Transport Processes And The X-Shaped Magnetic Field Of Ngc 4217: Off-Center Superbubble Structure, Y. Stein, R.-J. Dettmar, R. Beck, J. Irwin, T. Wiegert, A. Miskolczi, Q. D. Wang, J. English, R. Henriksen, M. Radica, J.-T. Li

Astronomy Department Faculty Publication Series

Context. Radio continuum observations of edge-on spiral galaxies reveal the appearance of radio halos as well as the large-scale structure of their magnetic fields. Furthermore, with multiple frequency observations, it is possible to deduce the transport mechanisms of the cosmic ray electrons (CREs).

Aims. In order to gain a better understanding of the influence of cosmic rays (CRs) and magnetic fields in the disk-halo interface of edge-on spiral galaxies, we investigate the radio continuum halo, the magnetic field, and the transport processes of the CRs of the edge-on spiral galaxy NGC 4217 using CHANG-ES radio data at two frequencies, 6 …

Distribution Ofwater Vapor In Molecular Clouds, G Melrick, V Tolls, Ronald L. Snell, E Bergin, D Hollenbach, M Kaufman, D Li, D Neufeld

Astronomy Department Faculty Publication Series

We report the results of a large-area study of water vapor along the Orion Molecular Cloud ridge, the purpose of which was to determine the depth-dependent distribution of gas-phase water in dense molecular clouds. We find that the water vapor measured toward 77 spatial positions along the face-on Orion ridge, excluding positions surrounding the outflow associated with BN/KL and IRc2, display integrated intensities that correlate strongly with known cloud surface tracers such as CN, C₂H, ¹³CO J = 5-4, and HCN, and less well with the volume tracer N₂H⁺. Moreover, at total column …

New Insights Into Galaxy Structure From Galphat– I. Motivation, Methodology And Benchmarks For Sérsic Models, I Yoon, M Weinberg, N Katz

Astronomy Department Faculty Publication Series

We introduce a new galaxy image decomposition tool, galphat (GALaxy PHotometric ATtributes), which is a front-end application of the Bayesian Inference Engine (bie), a parallel Markov chain Monte Carlo package, to provide full posterior probability distributions and reliable confidence intervals for all model parameters. The bie relies on galphat to compute the likelihood function. galphat generates scale-free cumulative image tables for the desired model family with precise error control. Interpolation of this table yields accurate pixellated images with any centre, scale and inclination angle. galphat then rotates the image by position angle using a Fourier shift theorem, yielding high-speed, accurate …

The Murmur Of The Hidden Monster: Chandra's Decadal View Of The Supermassive Black Hole In M31, Z Li, Mr Garcia, Wr Forman, C Jones, Rp Kraft, Dv Lal, Ss Murray, Qd Wang

Astronomy Department Faculty Publication Series

The Andromeda galaxy (M31) hosts a central supermassive black hole (SMBH), known as M31*, which is remarkable for its mass (~10⁸ M ) and extreme radiative quiescence. Over the past decade, the Chandra X-Ray Observatory has pointed to the center of M31 ~100 times and accumulated a total exposure of ~900 ks. Based on these observations, we present an X-ray study of a highly variable source that we associate with M31* based on positional coincidence. We find that M31* remained in a quiescent state from late 1999 to 2005, exhibiting an average 0.5-8 keV luminosity 10³⁶ erg s …

Title: Properties Of The Compact Hii Region Complex G-0.02-0.07, E Mills, Mr Morris, C Lang, H Dong, Qd Wang, A Cotera, S Stolovy

Astronomy Department Faculty Publication Series

Abstract: We present new extinction maps and high-resolution Paschen alpha images of G-0.02-0.07, a complex of compact HII regions located adjacent to the M-0.02-0.07 giant molecular cloud, 6 parsecs in projection from the center of the Galaxy. These HII regions, which lie in projection just outside the boundary of the Sgr A East supernova remnant, represent one of the most recent episodes of star formation in the central parsecs of the Galaxy. The 1.87 micron extinctions of regions A, B and C are almost identical, approximately 1.5 magnitudes. Region D, in contrast, has a peak 1.87 micron extinction of 2.3 …

A Green Bank Telescope Survey For H I 21 Cm Absorption In The Disks And Halos Of Low-Redshift Galaxies*, S Borthakur, Tm Tripp, Min Yun, Dv Bowen, Jd Meiring, Dg York, E Momjian

Astronomy Department Faculty Publication Series

We present an H I 21 cm absorption survey with the Green Bank Telescope (GBT) of galaxy-quasar pairs selected by combining galaxy data from the Sloan Digital Sky Survey (SDSS) and radio sources from the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) survey. Our sample consists of 23 sight lines through 15 low-redshift foreground galaxy-background quasar pairs with impact parameters ranging from 1.7 kpc up to 86.7 kpc. We detected one absorber in the GBT survey from the foreground dwarf galaxy, GQ1042+0747, at an impact parameter of 1.7 kpc and another possible absorber in our follow-up Very Large …

Evidence For 1000 Km S–1 Molecular Outflows In The Local Ulirg Population, A Chung, Min Yun, Gopal Narayanan, M Heyer, Nr Erickson

Astronomy Department Faculty Publication Series

The feedback from galactic outflows is thought to play an important role in shaping the gas content, star formation history, and ultimately the stellar mass function of galaxies. Here we present evidence for massive molecular outflows associated with ultra-luminous infrared galaxies (ULIRGs) in the co-added Redshift Search Receiver ¹²CO (1-0) spectrum. Our stacked spectrum of 27 ULIRGs at z = 0.043-0.11 (ν_rest = 110-120 GHz) shows broad wings around the CO line with ΔV(FWZI) 2000 km s^–1. Its integrated line flux accounts for up to 25% ± 5% of the total CO line luminosity. …

On The Clustering Of Sub-Millimeter Galaxies, Cc Williams, M Giavalisco, C Porciani, Min Yun, A Pope, Ks Scott, Je Austermann, I Aretxaga, B Hatsukade, K-S Lee, Gw Wilson, Jr Cybulski, Dh Hughes, R Kawabe, K Kohno, T Perera, Fp Schloerb

Astronomy Department Faculty Publication Series

We measure the angular two-point correlation function of sub-millimeter galaxies (SMGs) from 1.1-millimeter imaging of the COSMOS field with the AzTEC camera and ASTE 10-meter telescope. These data yields one of the largest contiguous samples of SMGs to date, covering an area of 0.72 degrees^2 down to a 1.26 mJy/beam (1-sigma) limit, including 189 (328) sources with S/N greater than 3.5 (3). We can only set upper limits to the correlation length r_0, modeling the correlation function as a power-law with pre-assigned slope. Assuming existing redshift distributions, we derive 68.3% confidence level upper limits of r_0 < 6-8 h^-1 Mpc at 3.7 mJy, and r_0 < 11-12 h^-1 Mpc at 4.2 mJy. Although consistent with most previous estimates, these upper limits imply that the real r_0 is likely smaller. This casts doubts on the robustness of claims that SMGs are characterized by significantly stronger spatial clustering, (and thus larger mass), than differently selected galaxies at high-redshift. Using Monte Carlo simulations we show that even strongly clustered distributions of galaxies can appear unclustered when sampled with limited sensitivity and coarse angular resolution common to current sub-millimeter surveys. The simulations, however, also show that unclustered distributions can appear strongly clustered under these circumstances. From the simulations, we predict that at our survey depth, a mapped area of two degrees^2 is needed to reconstruct the correlation function, assuming smaller beam sizes of future surveys (e.g. the Large Millimeter Telescope's 6" beam size). At present, robust measures of the clustering strength of bright SMGs appear to be below the reach of most observations.

The Jcmt Nearby Galaxies Legacy Survey – V. The Co(J= 3–2) Distribution And Molecular Outflow In Ngc 4631, Ja Irwin, Cd Wilson, T Wiegert, Gj Bendo, Be Warren, Qd Wang, Fp Israel, S Serjeant, Jh Knapen, E Brinks, Rpj Tilanus, P Van Der Werf, S Muhle

Astronomy Department Faculty Publication Series

We have made the first map of CO(J= 3–2) emission covering the disc of the edge-on galaxy, NGC 4631, which is known for its spectacular gaseous halo. The strongest emission, which we model with a Gaussian ring, occurs within a radius of 5 kpc. Weaker disc emission is detected out to radii of 12 kpc, the most extensive molecular component yet seen in this galaxy. From comparisons with infrared data, we find that CO(J= 3–2) emission more closely follows the hot dust component, rather than the cold dust, consistent with it being a good tracer of …

A Massive Protocluster Of Galaxies At A Redshift Of Z ≈ 5.3, Pl Capak, D Riechers, Nz Scoville, C Carilli, P Cox, R Neri, B Robertson, M Savato, E Schinnerer, L Yan, Gw Wilson, Min Yun, F Civano, M Elvis, A Karim, B Mobasher, Jg Staguhn

Astronomy Department Faculty Publication Series

Massive clusters of galaxies have been found that date from as early as 3.9 billion years¹ (3.9 Gyr; z = 1.62) after the Big Bang, containing stars that formed at even earlier epochs^{2, 3}. Cosmological simulations using the current cold dark matter model predict that these systems should descend from ‘protoclusters’—early overdensities of massive galaxies that merge hierarchically to form a cluster^{4, 5}. These protocluster regions themselves are built up hierarchically and so are expected to contain extremely massive galaxies that can be observed as luminous quasars and starbursts^{4, 5, …}

The Redshift And Nature Of Aztec/Cosmos 1: A Starburst Galaxy At Z = 4.6*, V Smolcic, Min Yun, Et. Al.

Astronomy Department Faculty Publication Series

Based on broadband/narrowband photometry and Keck DEIMOS spectroscopy, we report a redshift of z = 4.64^+0.06 _–0.08 for AzTEC/COSMOS 1, the brightest submillimeter galaxy (SMG) in the AzTEC/COSMOS field. In addition to the COSMOS-survey X-ray to radio data, we report observations of the source with Herschel/PACS (100, 160 μm), CSO/SHARC II (350 μm), and CARMA and PdBI (3 mm). We do not detect CO(5 → 4) line emission in the covered redshift ranges, 4.56-4.76 (PdBI/CARMA) and 4.94-5.02 (CARMA). If the line is within this bandwidth, this sets 3σ upper limits on the gas mass to 8 × 10 …

Identification Of A Complete 160 Μm Flux-Limited Sample Of Infrared Galaxies In The Iso Lockman Hole 1 Deg2 Deep Fields: Source Properties And Evidence For Strong Evolution In The Fir Luminosity Function For Ulirgs, Ba Jacobs, Db Sanders, Dsn Rupke, H Aussel, Dt Frayer, O Ilbert, Ks Kartaltepe, K Kawara, D-C Kim, E Le Floc'h, T Murayama, V Smolcic, Ja Surace, Y Taniguchi, S Veilleux, Min Yun

Astronomy Department Faculty Publication Series

We have identified a complete, flux-limited (S ₁₆₀>120 mJy) sample of 160 μm selected sources from Spitzer observations of the 1 deg² Infrared Space Observatory (ISO) Deep Field region in the Lockman Hole (LH). Ground-based UV, optical, and near-infrared (NIR) photometry and optical spectroscopy have been used to determine colors, redshifts, and masses for the complete sample of 40 galaxies. Spitzer-IRAC+MIPS photometry, supplemented by ISOPHOT data at 90 μm and 170 μm, has been used to calculate accurate total infrared luminosities, L _IR(8-1000 μm), and to determine the IR luminosity function (LF) of …