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Ly-alpha Emission-Line Galaxies at z = 3.1 in the Extended Chandra Deep
Field South | | C. Gronwall
; R. Ciardullo
; T. Hickey
; E. Gawaiser
; J. J. Feldmeier
; P. G. van Dokkum
; C. M. Urry
; D. Herrera
; B. D. Lehmer
; L. Infante
; A. Orsi
; D. Marchesini
; G. A. Blanc
; H. Francke
; P. Lira
; E. Treister
; | | Date: |
28 May 2007 | | Subject: | Astrophysics (astro-ph) | | Abstract: | We describe the results of an extremely deep, 0.28 deg^2 survey for z = 3.1
Ly-alpha emission-line galaxies in the Extended Chandra Deep Field South. By
using a narrow-band 5000 Anstrom filter and complementary broadband photometry
from the MUSYC survey, we identify a statistically complete sample of 162
galaxies with monochromatic fluxes brighter than 1.5 x 10^-17 ergs cm^-2 s^-1
and observers frame equivalent widths greater than 80 Angstroms. We show that
the equivalent width distribution of these objects follows an exponential with
a rest-frame scale length of w_0 = 76 +/- 10 Angstroms. In addition, we show
that in the emission line, the luminosity function of Ly-alpha galaxies has a
faint-end power-law slope of alpha = -1.49 +/- 0.4, a bright-end cutoff of log
L^* = 42.64 +/- 0.2, and a space density above our detection thresholds of 1.46
+/- 0.12 x 10^-3 h70^3 galaxies Mpc^-3. Finally, by comparing the emission-line
and continuum properties of the LAEs, we show that the star-formation rates
derived from Ly-alpha are ~3 times lower than those inferred from the
rest-frame UV continuum. We use this offset to deduce the existence of a small
amount of internal extinction within the host galaxies. This extinction,
coupled with the lack of extremely-high equivalent width emitters, argues that
these galaxies are not primordial Pop III objects, though they are young and
relatively chemically unevolved. | | Source: | arXiv, arxiv.0705.3917 | | Services: | Forum | Review | PDF | Favorites | |
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