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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 ORCID:, 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 ORCID:, 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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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: 20 Oct 2022 08:47

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