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HerMES: candidate high-redshift galaxies discovered with Hershel/Spire

Dowell, C. Darren, Conley, A., Glenn, J., Arumugam, V., Asboth, V., Aussel, H., Bertoldi, F., Béthermin, M., Bock, J., Boselli, A., Bridge, C., Buat, V., Burgarella, D., Cabrera-Lavers, A., Casey, C. M., Chapman, S. C., Clements, D. L., Conversi, L., Cooray, A., Dannerbauer, H., De Bernardis, F., Ellsworth-Bowers, T. P., Farrah, D., Franceschini, A., Griffin, Matthew J., Gurwell, M. A., Halpern, M., Hatziminaoglou, E., Heinis, S., Ibar, E., Ivison, R. J., Laporte, N., Marchetti, L., Martínez-Navajas, P., Marsden, G., Morrison, G. E., Nguyen, H. T., O'Halloran, B., Oliver, S. J., Omont, A., Page, M. J., Papageorgiou, Andreas, Pearson, C. P., Petitpas, G., Pérez-Fournon, I., Pohlen, M., Riechers, D., Rigopoulou, D., Roseboom, I. G., Rowan-Robinson, M., Sayers, J., Schulz, B., Scott, Douglas, Seymour, N., Shupe, D. L., Smith, A. J., Streblyanska, A., Symeonidis, M., Vaccari, M., Valtchanov, I., Vieira, J. D., Viero, M., Wang, L., Wardlow, J., Xu, C. K. and Zemcov, M. 2014. HerMES: candidate high-redshift galaxies discovered with Hershel/Spire. Astrophysical Journal 780 (1) , 75. 10.1088/0004-637X/780/1/75

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We present a method for selecting z > 4 dusty, star-forming galaxies (DSFGs) using Herschel/Spectral and Photometric Imaging Receiver 250/350/500 μm flux densities to search for red sources. We apply this method to 21 deg2 of data from the HerMES survey to produce a catalog of 38 high-z candidates. Follow-up of the first five of these sources confirms that this method is efficient at selecting high-z DSFGs, with 4/5 at z = 4.3-6.3 (and the remaining source at z = 3.4), and that they are some of the most luminous dusty sources known. Comparison with previous DSFG samples, mostly selected at longer wavelengths (e.g., 850 μm) and in single-band surveys, shows that our method is much more efficient at selecting high-z DSFGs, in the sense that a much larger fraction are at z > 3. Correcting for the selection completeness and purity, we find that the number of bright (S 500 μm ≥ 30 mJy), red Herschel sources is 3.3 ± 0.8 deg–2. This is much higher than the number predicted by current models, suggesting that the DSFG population extends to higher redshifts than previously believed. If the shape of the luminosity function for high-z DSFGs is similar to that at z ~ 2, rest-frame UV based studies may be missing a significant component of the star formation density at z = 4-6, even after correction for extinction.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: IOP Science
ISSN: 0004-637X
Funders: STFC
Date of First Compliant Deposit: 25 April 2017
Date of Acceptance: 25 October 2013
Last Modified: 18 Feb 2019 14:23

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