HerMES: candidate high-redshift galaxies discovered with Herschel/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, Franceshini, A, Griffin, M, 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, A, 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, Strevlyanska, A, Symeondis, M, Vaccari, M, Valtchanov, I, Viera, J D, Viero, M, Wang, L, Wardlow, J, Xu, C K and Zemcov, M (2013) HerMES: candidate high-redshift galaxies discovered with Herschel/Spire. Astrophysical Journal, 780 (1). p. 75. ISSN 0004-637X

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Abstract

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 deg 2 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 500μm >= 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
Keywords: galaxies: high-redshift – galaxies: starburst – infrared: galaxies – submillimeter: galaxies
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy > QB0460 Astrophysics
Depositing User: Richard Chambers
Date Deposited: 08 Jun 2015 15:16
Last Modified: 07 Mar 2017 08:52
URI: http://sro.sussex.ac.uk/id/eprint/54332

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