SPITZER-IRAC Identification of HERSCHEL-ATLAS SPIRE Sources

Autor: R. Hopwood, E. E. Rigby, Michael Pohlen, Rob Ivison, P. van der Werf, Julie Wardlow, R. S. Bussmann, S. Buttiglione, David L. Clements, Maarten Baes, Robbie Richard Auld, Antonio Cava, William J. Sutherland, Matt J. Jarvis, Ali Ahmad Khostovan, Enzo Pascale, Michał J. Michałowski, Douglas Scott, Stephen Anthony Eales, Pasquale Temi, Jacopo Fritz, David J. Smith, Steve Maddox, A. Dariush, Edo Ibar, Loretta Dunne, G. de Zotti, Simon Dye, S. Fleuren, Sam Kim, Asantha Cooray
Jazyk: angličtina
Rok vydání: 2012
Předmět:
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
0306 Physical Chemistry (Incl. Structural)
REDSHIFT SUBMILLIMETER GALAXIES
NEAR-INFRARED COUNTERPARTS
FOS: Physical sciences
galaxies: starburst
Astrophysics
SPECTRAL ENERGY-DISTRIBUTIONS
Astronomy & Astrophysics
01 natural sciences
0305 Organic Chemistry
infrared: galaxies
Identification rate
Atlas (anatomy)
galaxies: high-redshift
0103 physical sciences
medicine
STAR-FORMING GALAXIES
010303 astronomy & astrophysics
Physics
DEGREE EXTRAGALACTIC SURVEY
Science & Technology
010308 nuclear & particles physics
Astronomy and Astrophysics
Field population
ARRAY CAMERA IRAC
Galaxy
Redshift
SCUBA SUPER-MAP
Space and Planetary Science
Spire
0201 Astronomical And Space Sciences
medicine.anatomical_structure
Physical Sciences
astro-ph.CO
DEEP-FIELD-SOUTH
DIGITAL SKY SURVEY
SCIENCE DEMONSTRATION PHASE
Astrophysics - Cosmology and Nongalactic Astrophysics
DOI: 10.1088/0004-637X/756/1/28
Popis: We use spitzer-IRAC data to identify near-infrared counterparts to submillimeter galaxies detected with Herschel-SPIRE at 250um in the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). Using a likelihood ratio analysis we identify 146 reliable IRAC counterparts to 123 SPIRE sources out of the 159. We find that, compared to the field population, the SPIRE counterparts occupy a distinct region of 3.6 and 4.5um color-magnitude space, and we use this property to identify a further 23 counterparts to 13 SPIRE sources. The IRAC identification rate of 86% is significantly higher than those that have been demonstrated with wide-field ground-based optical and near-IR imaging of Herschel fields. We estimate a false identification rate of 3.6%, corresponding to 4 to 5 sources. Among the 73 counterparts that are undetected in SDSS, 57 have both 3.6 and 4.5um coverage. Of these 43 have [3.6] - [4.5]> 0 indicating that they are likely to be at z > 1.4. Thus, ~ 40% of identified SPIRE galaxies are likely to be high redshift (z > 1.4) sources. We discuss the statistical properties of the IRAC-identified SPIRE galaxy sample including far-IR luminosities, dust temperatures, star-formation rates, and stellar masses. The majority of our detected galaxies have 10^10 to 10^11 L_sun total IR luminosities and are not intense starbursting galaxies as those found at z ~ 2, but they have a factor of 2 to 3 above average specific star-formation rates compared to near-IR selected galaxy samples.
16 pages, 12 figures, two tables. Accepted for publication in ApJ
Databáze: OpenAIRE
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