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The Local Galaxy 8 micron Luminosity Function | J.-S. Huang
; M. L. N. Ashby
; P. Barmby
; M. Brodwin
; M. J. I. Brown
; N. Caldwell
; R. J. Cool
; P. Eisenhardt
; D. Eisenstein
; G. G. Fazio
; E. Le Floc'h
; P. Green
; C. S. Kochanek
; N. Y. Lu
; M. A. Pahre
; D. Rigopoulou
; J. L. Rosenberg
; H. A. Smith
; Z. Wang
; C. N. A. Willmer
; S. P. Willner
; | Date: |
26 Apr 2007 | Subject: | Astrophysics (astro-ph) | Abstract: | A SST survey in the NOAO Deep-Wide Field in Bo"otes provides a complete,
8-micron-selected sample of galaxies to a limiting (Vega) magnitude of 13.5. In
the 6.88 deg$^2$ field sampled, 79% of the 4867 galaxies have spectroscopic
redshifts, allowing an accurate determination of the local (z<0.3) galaxy
luminosity function. Stellar and dust emission can be separated on the basis of
observed galaxy colors. Dust emission (mostly PAH) accounts for 80% of the 8
micron luminosity, stellar photospheres account for 19%, and AGN emission
accounts for roughly 1 %. A sub-sample of the 8 micron-selected galaxies have
blue, early-type colors, but even most of these have significant PAH emission.
The luminosity functions for the total 8 micron luminosity and for the dust
emission alone are both well fit by Schechter functions. For the 8 micron
luminosity function, the characteristic luminosity is
u L_{
u}^*(8.0
micron) = 1.8 imes 10^{10}$ Lsun while for the dust emission alone it is
1.6 x 10^{10}$ Lsun
ull. The average 8 micron luminosity density at z<0.3 is
3.1 x 10^7 Lsun Mpc^{-3}, and the average luminosity density from dust alone
is 2.5 x 10^7 Lsun Mpc^{-3}. This luminos ity arises predominantly from
galaxies with 8 micron luminosities ($
u L_{
u}$) between $2 imes 10^9$ and
$2 x 10^{10}$ Lsun, i.e., normal galaxies, not LIRGs or ULIRGs. | Source: | arXiv, arxiv.0704.3609 | Services: | Forum | Review | PDF | Favorites |
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