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Balancing the Energy Budget between Star-Formation and AGN in High Redshift Infrared Luminous Galaxies
E. J. Murphy, R. -R. Chary, D. M. Alexander +5
(abridged) We present deep Spitzer mid-infrared spectroscopy, along with 16, 24, 70, and 850um photometry, for 22 galaxies located in GOODS-N. The sample spans a redshift range of…
Spitzer Observations of the z=2.73 Lensed Lyman Break Galaxy, MS1512-cB58
Brian Siana, Harry I. Teplitz, Ranga-Ram Chary +2
We present Spitzer infrared (IR) photometry and spectroscopy of the lensed Lyman break galaxy (LBG), MS1512-cB58 at z=2.73. The large (factor ~30) magnification allows for the most…
A Large Population of High Redshift Galaxy Clusters in the IRAC Shallow Cluster Survey
Mark Brodwin, Peter R. Eisenhardt, Anthony H. Gonzalez +6
We have identified 335 galaxy cluster and group candidates spanning 0<z<2, using a 4.5um selected sample of galaxies in a 7.25 deg^2 region in the Spitzer/IRAC Shallow Survey. Usin…
Molecular Gas in the z=1.2 Ultraluminous Merger GOODS J123634.53+621241.3
David T. Frayer, Jin Koda, Alexandra Pope +14
We report the detection of CO(2-1) emission from the z=1.2 ultraluminous infrared galaxy (ULIRG) GOODS J123634.53+621241.3 (also known as the sub-millimeter galaxy GN26). These obs…
IRAC Excess in Distant Star-Forming Galaxies: Tentative Evidence for the 3.3m Polycyclic Aromatic Hydrocarbon Feature ?
B. Magnelli, R. R. Chary, A. Pope +3
We present evidence for the existence of an IRAC excess in the spectral energy distribution (SED) of 5 galaxies at 0.6<z<0.9 and 1 galaxy at z=1.7. These 6 galaxies, located in the…
Reliable Identification of Compton-thick Quasars at z~2: Spitzer Mid-IR spectroscopy of HDF-oMD49
D. M. Alexander, R. R. Chary, A. Pope +6
Many models that seek to explain the origin of the unresolved X-ray background predict that Compton-thick Active Galactic Nuclei (AGNs) are ubiquitious at high redshift. However, f…
Mid-Infrared Spectral Diagnosis of Submillimeter Galaxies
Alexandra Pope, Ranga-Ram Chary, David M. Alexander +6
We present deep mid-infrared spectroscopy with the Spitzer Space Telescope of 13 submillimeter galaxies (SMGs) in the Great Observatories Origins Deep Survey North (GOODS-N) field.…
The spatial clustering of mid-IR selected star forming galaxies at z ~ 1 in the GOODS fields
R. Gilli, E. Daddi, R. Chary +6
We present the first spatial clustering measurements of z~1, 24um-selected, star forming galaxies in the Great Observatories Origins Deep Survey (GOODS). The sample under investiga…
Spitzer Observations of Gamma-Ray Burst Host Galaxies: A Unique Window into High Redshift Chemical Evolution and Star-formation
Ranga-Ram Chary, Edo Berger, Len Cowie
We present deep Spitzer 3.6 micron observations of three z~5 GRB host galaxies. Our observations reveal that z~5 GRB hosts are a factor of 3 less luminous than the median rest-fram…
The Far-Infrared Luminosity Function from GOODS-N: Constraining the Evolution of Infrared Galaxies for z \leq 1
Minh T. Huynh, David T. Frayer, Bahram Mobasher +3
We present the IR luminosity function derived from ultra-deep 70 micron imaging of the GOODS-North field. The 70 micron observations are longward of the PAH and silicate features w…
HUDF-JD2: Mid-infrared Evidence for a z~2 Luminous Infrared Galaxy
Ranga-Ram Chary, Harry I. Teplitz, Mark E. Dickinson +5
The Hubble Ultra Deep Field source JD2 presented in Mobasher et al. (2005) is an unusual galaxy that is very faint at all wavelengths shortward of 1.1 micron. Photometric redshift…
Multiwavelength study of massive galaxies at z~2. II. Widespread Compton thick AGN and the concurrent growth of black holes and bulges
E. Daddi, D. M. Alexander, M. Dickinson +16
Approximately 20-30% of 1.4<z<2.5 galaxies with K<22 (Vega) detected with Spitzer MIPS at 24um show excess mid-IR emission relative to that expected based on the rates of star form…
Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth
E. Daddi, M. Dickinson, G. Morrison +12
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 from Spitzer at mid- and far-IR, to sub…
The reversal of the star formation-density relation in the distant universe
D. Elbaz, E. Daddi, D. Le Borgne +11
We study the relationship between the local environment of galaxies and their star formation rate (SFR) in the Great Observatories Origins Deep Survey, GOODS, at z~1, from ultradee…
Measuring PAH Emission in Ultradeep Spitzer IRS Spectroscopy of High Redshift IR Luminous Galaxies
H. I. Teplitz, V. Desai, L. Armus +10
The study of the dominant population of high redshift IR-luminous galaxies (10^11 - 10^12 Lsun at 1<z<3), requires observation of sources at the ~0.1 mJy level in the mid-IR. We pr…
Arp102B: An ADAF and a Torus ?
Ranga-Ram Chary
Arp102B is a nearby radio galaxy which displays the presence of double peaked Balmer emission lines. Sub-arcsec Keck mid-infrared imaging and Spitzer spectroscopy reveal a spatiall…
Insights into Galaxy Evolution from Mid-infrared Wavelengths
Ranga-Ram Chary
In this paper, I have attempted to highlight key results from deep extragalactic surveys at mid-infrared wavelengths. I discuss advances in our understanding of dust enshrouded sta…
IR Background Anisotropies in Spitzer GOODS images and constraints on first galaxies
Asantha Cooray, Ian Sullivan, Ranga-Ram Chary +6
We describe the angular power spectrum of unresolved 3.6 micron IR light in Spitzer GOODS fields. The amplitude of the anisotropy spectrum decreases with decreasing flux threshold…
Infrared spectral energy distributions of submillimetre galaxies
Alexandra Pope, Ranga-Ram Chary, Mark Dickinson +1
Submillimetre (sub-mm) galaxies have very high infrared (IR) luminosities and are thousands of times more numerous at z~2 than local ultra-luminous IR galaxies. They therefore repr…
Search with EGRET for a Gamma Ray Line from the Galactic Center
Anthony R. Pullen, Ranga-Ram Chary, Marc Kamionkowski
We search data from the Energetic Gamma Ray Experiment Telescope (EGRET) for a gamma-ray line in the energy range 0.1-10 GeV from the 10 X 10 degree region around the Galactic cent…
Clustering of the IR Background Light with Spitzer: Contribution from Resolved Sources
Ian Sullivan, Asantha Cooray, Ranga-Ram Chary +14
We describe the angular power spectrum of resolved sources at 3.6 microns (L-band) in Spitzer imaging data of the GOODS HDF-N, the GOODS CDF-S, and the NDWFS Bootes field in severa…
Spitzer Observations of the Prototypical Extremely Red Objects HR10 and LBDS53W091: Separating Dusty Starbursts from Old Elliptical Galaxies
Daniel Stern, Ranga-Ram Chary, Peter Eisenhardt +1
We present Spitzer Space Telescope observations of the well-studied extremely red objects (EROs) HR10 and LBDS53W091 from 3.6 to 160 microns. These galaxies are the prototypes of t…
Spitzer 70-micron Source Counts in GOODS-North
D. T. Frayer, M. T. Huynh, R. Chary +7
We present ultra-deep Spitzer 70-micron observations of GOODS-North. For the first time, the turn-over in the 70-micron Euclidean-normalized differential source counts is observed.…
Far-Ultraviolet Imaging of the Hubble Deep Field North: Star Formation in Normal Galaxies at z<1
H. I. Teplitz, B. Siana, T. M. Brown +9
We present far-ultraviolet (FUV) imaging of the Hubble Deep Field North (HDF-N) taken with the Solar Blind Channel of the Advanced Camera for Surveys (ACS/SBC) and the FUV MAMA det…