Article

<i>SPITZER</i>BRIGHT, ULTRAVISTA FAINT SOURCES IN COSMOS: THE CONTRIBUTION TO THE OVERALL POPULATION OF MASSIVE GALAXIES AT<i>z</i>= 3–7

K. I. CaputiKapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700 AV Groningen, The Netherlands; [email protected]O. IlbertAix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille), UMR 7326, F-13388, Marseille, FranceC. LaigleSorbonne Universités, UPMC Université Paris 6 et CNRS, UMR 7095, Institut d’Astrophysique de Paris, 98 bis Boulevard Arago, F-75014 Paris, FranceH. J. McCrackenSorbonne Universités, UPMC Université Paris 6 et CNRS, UMR 7095, Institut d’Astrophysique de Paris, 98 bis Boulevard Arago, F-75014 Paris, FranceO. Le FèvreAix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille), UMR 7326, F-13388, Marseille, FranceJ. P. U. FynboDark Cosmology Center, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, DenmarkB. Milvang‐JensenDark Cosmology Center, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, DenmarkP. CapakSpitzer Science Center, California Institute of Technology, Pasadena, CA 91125, USAM. SalvatoExcellence Cluster, Boltzmann Strasse 2, D-85748 Garching, GermanyYoshiaki TaniguchiResearch Center for Space and Cosmic Evolution, Ehime University, 2-5 Bunkyo-cho, Matsuyama 790-8577, Japan

2015en

ABI

Abstract

We have analyzed a sample of 574 Spitzer 4.5 m selected galaxies with 4.5 23 [ ] < and K 24 s auto > (AB) over the UltraVISTA ultradeep COSMOS field. Our aim is to investigate whether these mid-infrared (mid-IR) bright, nearinfrared (near-IR) faint sources contribute significantly to the overall population of massive galaxies at redshifts z 3 . By performing a spectral energy distribution (SED) analysis using up to 30 photometric bands, we have determined that the redshift distribution of our sample peaks at redshifts z 2.5 -3.0, and 32% ~of the galaxies lie at z 3 . We have studied the contribution of these sources to the galaxy stellar mass function (GSMF) at high redshifts. We found that the 4.5 23 [ ] < , K 24 s auto > galaxies produce a negligible change to the GSMF previously determined for K 24 s auto < sources at z 3 4 < , but their contribution is more important at z 4 5 < , accounting for 50% of the galaxies with stellar masses M M 6 10 st 10

Identifiers

DOI: 10.1088/0004-637x/810/1/73

Citations and references

Cited by 10 references

Metrics — AkademScholar