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The UDF05 Follow-up of the HUDF: I. The Faint-End Slope of the
Lyman-Break Galaxy Population at z~5 | | P. A. Oesch
; M. Stiavelli
; C. M. Carollo
; L. E. Bergeron
; A. M. Koekemoer
; R. A. Lucas
; C. M. Pavlovsky
; M. Trenti
; S. J. Lilly
; S. V. W. Beckwith
; T. Dahlen
; H. C. Ferguson
; J. P. Gardner
; C. Lacey
; B. Mobasher
; N. Panagia
; H.-W. Rix
; | | Date: |
18 Jun 2007 | | Abstract: | We present the UDF05 project, a HST Large Program of deep ACS (F606W, F775W,
F850LP) and NICMOS (F110W, F160W) imaging of three fields, two of which
coincide with the NICP1-4 NICMOS parallel observations of the Hubble Ultra Deep
Field (HUDF). In this first paper we use the ACS data for the NICP12 field, as
well as the original HUDF ACS data, to measure the UV Luminosity Function (LF)
of z~5 Lyman Break Galaxies (LBGs) down to very faint levels. Specifically,
based on a V-i, i-z selection criterion, we identify a sample of 101 and 133
candidate z~5 galaxies down to z_{850}=28.5 and 29.25 magnitudes in the NICP12
field and in the HUDF, respectively. Using an extensive set of Monte Carlo
simulations we derive corrections for observational biases and selection
effects, and construct the rest-frame 1400 Angstrom LBG LF over the range
M_{1400}=[-22.2, -17.1], i.e. down to ~0.04 L* at z~5. We show that: (i)
Different assumptions for the SED distribution of the LBG population, dust
properties and intergalactic absorption result in a 25% variation in the number
density of LBGs at z~5; (ii) Under consistent assumptions for dust properties
and intergalactic absorption, the HUDF is about 30% under-dense in z~5 LBGs
relative to the NICP12 field, a variation which is well explained by cosmic
variance; (iii) The faint-end slope of the LF is independent of the specific
assumptions for the input physical parameters, and has a value of alpha ~
-1.6, similar to the faint-end slope of the LF that has been measured for LBGs
at z~3 and z~6. Our study therefore supports no variation in the faint-end of
the LBG LF over the whole redshift range z~3 to z~6. | | Source: | arXiv, arxiv.0706.2653 | | Services: | Forum | Review | PDF | Favorites | |
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