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The infrared properties of sources matched in the WISE all-sky and HERSCHEL atlas surveys

Bond, Nicholas A., Benford, Dominic J., Gardner, Jonathan P., Amblard, Alexandre, Fleuren, Simone, Blain, Andrew W., Dunne, Loretta, Smith, Daniel J. B., Maddox, Steve, Hoyos, Carlos, Baes, Maarten, Bonfield, David, Bourne, Nathan, Bridge, Carrie, Buttiglione, Sara, Cava, Antonio, Clements, David, Cooray, Asantha, Dariush, Ali, de Zotti, Gianfranco, Driver, Simon, Dye, Simon, Eales, Stephen Anthony, Eisenhardt, Peter, Hopwood, Rosalind, Ibar, Edo, Ivison, Rob J., Jarvis, Matt J., Kelvin, Lee, Robotham, Aaron S. G., Temi, Pasquale, Thompson, Mark, Tsai, Chao-Wei, van der Werf, Paul, Wright, Edward L., Wu, Jingwen and Yan, Lin 2012. The infrared properties of sources matched in the WISE all-sky and HERSCHEL atlas surveys. Astrophysical Journal Letters 750 (1) , L18. 10.1088/2041-8205/750/1/L18

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Abstract

We describe the infrared properties of sources detected over ~36 deg2 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 5σ point-source depths of 34 and 0.048 mJy at 250 μm and 3.4 μm, 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–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 μm and that at 250 μm, with ±50% scatter over ~1.5 orders of magnitude in luminosity, ~109-1010.5 L ☉. By contrast, the matched sources without previously measured redshifts (r 20.5) have 250-350 μm 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 μm 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 μm flux-limited subsample of H-ATLAS sources, also consistent with there being a significant population of high-redshift sources in the no-redshift sample.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: cosmology: observations; galaxies: general; galaxies: high-redshift; galaxies: statistics; infrared: galaxies; surveys
Publisher: Institute of Physics
ISSN: 2041-8205
Last Modified: 04 Jun 2017 03:57
URI: http://orca.cf.ac.uk/id/eprint/29630

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