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26 April 2024 |
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Far-IR Emission From Dust-Obscured Galaxies | | J.A. Calanog
; J. Wardlow
; Hai Fu
; A. Cooray
; R.J. Assef
; J. Bock
; C.M. Casey
; A. Conley
; D. Farrah
; E. Ibar
; J. Kartaltepe
; G. Magdis
; L. Marchetti
; S.J. Oliver
; I. Perez-Fournon
; D. Riechers
; D. Rigopoulou
; I.G. Roseboom
; B. Schulz
; Douglas Scott
; M. Symeonidis
; M. Vaccari
; M. Viero
; M. Zemcov
; | | Date: |
16 Apr 2013 | | Abstract: | Dust-obscured galaxies (DOGs) are a UV-faint, IR-bright galaxy population
that reside at z~2 and are believed to be in a phase of dusty star-forming and
AGN activity. We present far-IR observations of a complete sample of DOGs in
the 2 deg^2 of COSMOS. The 3077 DOGs have <z>=1.9+/-0.3 and are selected from
24 um and r+ observations using a color cut of r+ - [24] >= 7.5 (AB mag) and
S24 >= 100 uJy. Based on the mid-IR SEDs, 47% are star-formation dominated and
10% are AGN-dominated. We use SPIRE far-IR photometry from HerMES to calculate
the IR luminosity and characteristic dust temperature for the 1572 (51%) DOGs
that are detected at 250 um (>=3sigma). For the remaining 1505 (49%) that are
undetected, we perform a median stacking analysis to probe fainter
luminosities. Detected and undetected DOGs have average IR luminosities of
(2.8+/-0.4) x 10^12 L_Sun and (0.77+/-0.08) x 10^12L_Sun, and dust temperatures
of 34+/-7 K and 31+/-3 K, respectively. Using far-IR observations, DOGs
contribute 30% to the 24 um-selected galaxies’ IR luminosity. If the IR
luminosity is extrapolated using the 24 um flux density alone, it is
overestimated by a factor of 2 on average. DOGs contribute 10-30% to the total
star formation rate density of the Universe at z=1.5-2.5, dominated by
250{mu}m detected and bump DOGs, compared to around 40% for all 24 um galaxies
above our flux limit. DOGs have a large scatter about the star-formation main
sequence and their specific star-formation rates show that the observed phase
of star-formation could be responsible for their observed stellar mass at z~2. | | Source: | arXiv, 1304.4593 | | Services: | Forum | Review | PDF | Favorites | |
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