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Spitzer IRAC identification of Herschel-ATLAS SPIRE sources

Kim, Sam, Wardlow, J. L., Cooray, A., Fleuren, S., Sutherland, W., Khostovan, A. A., Auld, Robbie Richard, Baes, M., Bussmann, R. S., Buttiglione, S., Cava, A., Clements, D., Dariush, A., De Zotti, G., Dunne, Loretta ORCID:, Dye, S., Eales, Stephen Anthony ORCID:, Fritz, J., Hopwood, R., Ibar, E., Ivison, R., Jarvis, M., Maddox, Steve ORCID:, Michalowski, M. J., Pascale, Enzo ORCID:, Pohlen, M., Rigby, E., Scott, D., Smith, D. J. B., Temi, P. and van der Werf, P. 2012. Spitzer IRAC identification of Herschel-ATLAS SPIRE sources. Astrophysical Journal 756 , 28. 10.1088/0004-637X/756/1/28

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: American Astronomical Society
ISSN: 0004-637X
Last Modified: 21 Oct 2022 09:15

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