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A Census of Star-Forming Galaxies at z = 1-3 in the Subaru Deep Field | | Chun Ly
; Matthew A. Malkan
; Masao Hayashi
; Kentaro Motohara
; Nobunari Kashikawa
; Kazuhiro Shimasaku
; Tohru Nagao
; Celestine Grady
; | | Date: |
26 Apr 2011 | | Abstract: | Several UV and near-infrared color selection methods have identified galaxies
at z = 1-3. Since each method suffers from selection biases, we have applied
three leading techniques (Lyman break, BX/BM, and BzK selection) simultaneously
in the Subaru Deep Field. This field has reliable ({Delta}z/(1 + z) =
0.02-0.09) photometric redshifts for ~53,000 galaxies from 20 bands (1500{AA}
- 2.2{mu}m). The BzK, LBG, and BX/BM samples suffer contamination from z<1
interlopers of 6%, 8%, and 20%, respectively. Around the redshifts where it is
most sensitive (z~1.9 for star-forming BzK, z~1.8 for z~2 LBGs, z~1.6 for BM,
and z~2.3 for BX), each technique finds 60-80% of the census of the three
methods. In addition, each of the color techniques shares 75-96% of its
galaxies with another method, which is consistent with previous studies that
adopt identical criteria on magnitudes and colors. Combining the three samples
gives a comprehensive census that includes ~90% of z-phot = 1-3 galaxies, using
standard magnitude limits similar to previous studies. In fact, we find that
among z = 1-2.5 galaxies in the color selection census, 81-90% of them can be
selected by just combining the BzK selection with one of the UV techniques (z~2
LBG or BX and BM). The average galaxy stellar mass, reddening and SFRs all
decrease systematically from the sBzK population to the LBGs, and to the
BX/BMs. The combined color selections yield a total cosmic SFR density of 0.18
$pm$ 0.03 M_sun yr^{-1} Mpc^{-3} for K_AB <= 24. We find that 65% of the star
formation is in galaxies with E(B-V) > 0.25 mag, even though they are only
one-fourth of the census by number. | | Source: | arXiv, 1104.5019 | | Services: | Forum | Review | PDF | Favorites | |
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