Star Formation in Distant Red Galaxies: Spitzer observations in the Hubble Deep Field South

Abstract

We present Spitzer 24micron imaging of 1.5 < z < 2.5 Distant Red Galaxies (DRGs) in the 10arcmin by 10arcmin Extended Hubble Deep Field South of the Multiwavelength Survey by Yale-Chile. We detect 65% of the DRGs with K_AB < 23.2 mag at S_24micron > 40uJy, and conclude that the bulk of the DRG population are dusty active galaxies. A mid-infrared (MIR) color analysis with IRAC data suggests that the MIR fluxes are not dominated by buried AGN, and we interpret the high detection rate as evidence for a high average star formation rate of <SFR> = 130+/-30 M/yr. From this, we infer that DRGs are important contributors to the cosmic star formation rate density at z ~ 2, at a level of \~0.02 M/yr/Mpc^3 to our completeness limit of K_AB = 22.9 mag

arXiv comment4 pages, 3 figures, accepted for publication in ApJL

References in corpus (27)

• The Global Schmidt Law in Star Forming Galaxies
• Lyman Break Galaxies at z>4 and the Evolution of the UV Luminosity Density at High Redshift
• A Redshift Survey of the Submillimeter Galaxy Population
• The Rest-Frame Optical Properties of z~3 Galaxies
• A Significant Population of Red, Near-IR Selected High Redshift Galaxies
• The Bulk of the Cosmic Infrared Background Resolved by ISOCAM
• IRAC Mid-Infrared Imaging of the Hubble Deep Field South: Star Formation Histories and Stellar Masses of Red Galaxies at z>2
• Metallicity Effects on Mid-Infrared Colors and the 8 micron PAH Emission in Galaxies
• Reduction Algorithms for the Multiband Imaging Photometer for Spitzer
• The 24 Micron Source Counts in Deep Spitzer Surveys
• The Nature of Radio Emission from Distant Galaxies: The 1.4 GHz Observations
• Extragalactic Results from the Infrared Space Observatory
• The Rest-Frame Optical Luminosity Density, Color, and Stellar Mass Density of the Universe from z=0 to z=3
• Pah and Mid-IR Luminosities as Measures of Star-Formation Rate in Spitzer First Look Survey Galaxies
• A Census of Optical and Near-Infrared Selected Star-Forming and Passively Evolving Galaxies at Redshift Z~2
• A Substantial Population of Red Galaxies at z > 2: Modeling of the Spectral Energy Distributions of an Extended Sample
• Spectroscopic Confirmation of a Substantial Population of Luminous Red Galaxies at Redshifts z>2
• Spitzer observations of MAMBO galaxies: weeding out active nuclei in starbursting proto-ellipticals
• SPITZER Observations of the SCUBA/VLA Sources in the Lockman Hole: Star Formation History of Infrared-Luminous Galaxies
• Radio Observations of the Hubble Deep Field South Region II: The 1.4 GHz Catalogue and Source Counts
• A K-band Selected Photometric Redshift Catalog in the HDF-S: Sampling the Rest-Frame V-Band to z=3
• IRAC Imaging of Lockman Hole
• Anomalously low PAH emission from low-luminosity galaxies
• Infrared Luminous Lyman Break Galaxies: A Population that Bridges LBGs and SCUBA Galaxies
• Submillimeter observations of Distant Red Galaxies: uncovering the 1mJy 850um-population
• Why Optically--Faint AGN Are Faint: The Spitzer Perspective
• Chandra Constraints on the AGN Fraction and Star Formation Rate of Red z>~2 Galaxies in the FIRES MS1054-03 Field

Cited by in corpus (36)

• The Mid-Infrared Spectrum of Star-Forming Galaxies: Global Properties of PAH Emission
• The stellar mass assembly of galaxies from z=0 to z=4. Analysis of a sample selected in the rest-frame near-infrared with Spitzer
• Stellar Population Diagnostics of Elliptical Galaxy Formation
• The Evolutionary History of Lyman Break Galaxies Between Redshift 4 and 6: Observing Successive Generations of Massive Galaxies in Formation
• What do we learn from IRAC observations of galaxies at 2 < z < 3.5?
• Resolved Galaxies in the Hubble Ultra Deep Field: Star Formation in Disks at High Redshift
• Ly Alpha-Emitting Galaxies at z=3.1: L* Progenitors Experiencing Rapid Star Formation
• Deep Spitzer 24mic COSMOS imaging -- I. The evolution of luminous dusty galaxies - Confronting the models
• HST and Spitzer imaging of red and blue galaxies at z~2.5: A correlation between size and star formation activity from compact quiescent galaxies to extended star forming galaxies
• Spectroscopic Identification of Massive Galaxies at z~2.3 with Strongly Suppressed Star Formation
• The First Appearance of the Red Sequence of Galaxies in Proto-Clusters at 2<~z<~3
• The Space Density and Colors of Massive Galaxies at 2<z<3: the Predominance of Distant Red Galaxies
• Spitzer Mid-to-Far-Infrared Flux Densities of Distant Galaxies
• The Detection of a Red Sequence of Massive Field Galaxies at z~2.3 and its Evolution to z~0
• The Star Formation Epoch of the Most Massive Early-Type Galaxies
• On the Evolutionary History of Stars and their Fossil Mass and Light
• Lyman break galaxies, Lya emitters and a radio galaxy in a protocluster at z=4.1
• The Multiwavelength Survey by Yale-Chile (MUSYC): Deep Near-Infrared Imaging and the Selection of Distant Galaxies
• Clustering of K-selected Galaxies at 2<z<3.5: Evidence for a Color-Density Relation
• The Progenitors of Local Ultra-massive Galaxies Across Cosmic Time: from Dusty Star-bursting to Quiescent Stellar Populations
• Direct Measurements of the Stellar Continua and Balmer/4000 Angstrom Breaks of Red z>2 Galaxies: Redshifts and Improved Constraints on Stellar Populations
• Mapping dusty star formation in and around a cluster at z=0.81 by wide-field imaging with AKARI
• Unveiling the oldest and most massive galaxies at very high redshift
• The Local Galaxy 8 micron Luminosity Function
• IRS Spectroscopy and Multi-wavelength Study of Luminous Star-forming Galaxies at z~1.9
• Spitzer IRAC Infrared Colours of Submillimetre-bright Galaxies
• The Color Magnitude Distribution of Field Galaxies to z~3: the evolution and modeling of the blue sequence
• Star Formation and AGN activity in Galaxies classified using the 1.6 μm Bump and PAH features at $z=0.4-2$
• MOIRCS Deep Survey III: Active Galactic Nuclei in Massive Galaxies at z=2-4
• Subaru/MOIRCS Near-Infrared Imaging in the Proto-Cluster Region at z=3.1
• Paschen-alpha Emission in the Gravitationally Lensed Galaxy SMM J163554.2+661225
• The SCUBA HAlf Degree Extragalactic Survey (SHADES) -- V. Submillimetre properties of near-infrared--selected galaxies in the Subaru/XMM--Newton deep field
• On the Stellar Populations in Faint Red Galaxies in the Hubble Ultra Deep Field
• Spitzer's View of the Candidate Cluster and Protocluster Catalog (CCPC)
• The Star Formation History and Stellar Assembly of High Redshift Galaxies
• Physical properties of distant red galaxies in the COSMOS/UltraVISTA field