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Title:
The UDF05 Follow-up of the Hubble Ultra Deep Field. I. The Faint-End Slope of the Lyman Break Galaxy Population at z ~ 5
Authors:
Oesch, P. A.; Stiavelli, M.; Carollo, C. M.; Bergeron, L. E.; Koekemoer, A. M.; Lucas, R. A.; Pavlovsky, C. M.; Trenti, M.; Lilly, S. J.; Beckwith, S. V. W.; Dahlen, T.; Ferguson, H. C.; Gardner, Jonathan P.; Lacey, C.; Mobasher, B.; Panagia, N.; Rix, H.-W.
Affiliation:
AA(Institute of Astrophysics, ETH Zurich, CH-8093 Zurich, Switzerland; .), AB(Space Telescope Science Institute, Baltimore, MD 21218.; Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218.), AC(Institute of Astrophysics, ETH Zurich, CH-8093 Zurich, Switzerland; .), AD(Space Telescope Science Institute, Baltimore, MD 21218.), AE(Space Telescope Science Institute, Baltimore, MD 21218.), AF(Space Telescope Science Institute, Baltimore, MD 21218.), AG(Space Telescope Science Institute, Baltimore, MD 21218.), AH(Space Telescope Science Institute, Baltimore, MD 21218.), AI(Institute of Astrophysics, ETH Zurich, CH-8093 Zurich, Switzerland; .), AJ(Space Telescope Science Institute, Baltimore, MD 21218.), AK(Space Telescope Science Institute, Baltimore, MD 21218.), AL(Space Telescope Science Institute, Baltimore, MD 21218.), AM(Laboratory for Observational Cosmology, Code 665, NASA Goddard Space Flight Center, Greenbelt, MD 20771.), AN(Department of Physics, Institute for Computational Cosmology, University of Durham, South Road, Durham DH1 3LE, UK.), AO(Space Telescope Science Institute, Baltimore, MD 21218.), AP(Space Telescope Science Institute, Baltimore, MD 21218.; INAF-Osservatorio Astrofisico di Catania, Via Santa Sofia 78, I-95123 Catania, Italy.; Supernova Ltd., OYV 131, Northsound Road, Virgin Gorda, British Virgin Islands.), AQ(Max Planck Institute for Astronomy, D-69117 Heidelberg, Germany.)
Publication:
The Astrophysical Journal, Volume 671, Issue 2, pp. 1212-1226. (ApJ Homepage)
Publication Date:
12/2007
Origin:
UCP
ApJ Keywords:
Cosmology: Dark Matter, Galaxies: Evolution, Galaxies: Formation, Galaxies: High-Redshift, Galaxies: Luminosity Function, Mass Function
DOI:
10.1086/522423
Bibliographic Code:
2007ApJ...671.1212O

Abstract

We present the UDF05 HST program, which consists of three disjoint fields-NICP12, NICP34, plus the HUDF-with deep ACS (F606W, F775W, and F850LP) and NICMOS (F110W and F160W) imaging. Here we use the ACS data for the NICP12 and HUDF fields to implement a (V-i)-(i-z) selection criterion that allows us to identify a sample of 101 (133) z~5 Lyman break galaxies (LBGs) down to z850=28.5 (29.25) mag in NICP12 (HUDF). We construct the rest-frame 1400 Å LBG luminosity function (LF) over the range M1400=[-21.4,-17.1], i.e. down to ~0.04L* at z~5, and use Subaru Deep Field results (Yoshida et al. 2006) to constrain our LF at the bright end (M1400>=-22.2). We show that (1) different assumptions regarding the LBG SED distribution, dust properties, and intergalactic absorption result in a 25% variation in the number density of LBGs at z~5 (2) under consistent assumptions for dust properties and intergalactic absorption, the HUDF is ~30% underdense in z~5 LBGs relative to the NICP12 field, a variation which is well explained by cosmic variance; and (3) the faint-end slope of the LF does not depend on the input parameters, and has a value of α~-1.6, similar to the faint-end slope of the LF of z~3 and z~6 LBGs. Our study therefore supports no variation in the faint end of the LBG LF over the whole redshift range z~3 to z~6. Based on a comparison with semianalytical models, we speculate that the z~5 LBGs might have a top-heavy IMF.

Based on data obtained with the Hubble Space Telescope operated by the Association of Universities for Research in Astronomy, Inc., for NASA under contract NAS5-26555.


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