THE INFRARED PROPERTIES OF SOURCES MATCHED IN THE WISE ALL-SKY AND HERSCHEL ATLAS SURVEYS

We describe the infrared properties of sources detected over ~36 deg super(2) of sky in the GAMA 15 hr equatorial field, using data from both the Herschel Astrophysical Terahertz Large-Area Survey (H-ATLAS) and Wide-field Infrared Survey (WISE). With 5[sigma] point-source depths of 34 and 0.048 mJy...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2012-05, Vol.750 (1), p.1-6
Main Authors: Bond, Nicholas A, Benford, Dominic J, Gardner, Jonathan P, Amblard, Alexandre, Fleuren, Simone, Blain, Andrew W, Dunne, Loretta, Smith, Daniel J B, Maddox, Steve J, Hoyos, Carlos
Format: Article
Language:English
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CORRELATIONS
COSMOLOGY
Density
Flux
FLUX DENSITY
GALAXIES
GALAXY NUCLEI
Infrared
INFRARED RADIATION
INFRARED SURVEYS
LUMINOSITY
POINT SOURCES
RED SHIFT
Space telescopes
Spectroscopy
STARS
STATISTICS
SURFACES
Surveys
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Summary:We describe the infrared properties of sources detected over ~36 deg super(2) of sky in the GAMA 15 hr equatorial field, using data from both the Herschel Astrophysical Terahertz Large-Area Survey (H-ATLAS) and Wide-field Infrared Survey (WISE). With 5[sigma] point-source depths of 34 and 0.048 mJy at 250 mu m and 3.4 mu m, respectively, we are able to identify 50.6% of the H-ATLAS sources in the WISE survey, corresponding to a surface density of ~630 deg super(-2). Approximately two-thirds of these sources have measured spectroscopic or optical/near-IR photometric redshifts of z < 1. For sources with spectroscopic redshifts at z < 0.3, we find a linear correlation between the infrared luminosity at 3.4 mu m and that at 250 mu m, with + or -50% scatter over ~1.5 orders of magnitude in luminosity, ~10 super(9)-10 super(10.5) L sub([middot in circle]). By contrast, the matched sources without previously measured redshifts (r [> ~] 20.5) have 250-350 mu m flux density ratios which suggest either high-redshift galaxies (z [> ~] 1.5) or optically faint low-redshift galaxies with unusually low temperatures (T [> ~] 20). Their small 3.4-250 mu m flux ratios favor a high-redshift galaxy population, as only the most actively star-forming galaxies at low redshift (e.g., Arp 220) exhibit comparable flux density ratios. Furthermore, we find a relatively large active galactic nucleus fraction (~30%) in a 12 mu m flux-limited subsample of H-ATLAS sources, also consistent with there being a significant population of high-redshift sources in the no-redshift sample.
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/750/1/L18