HerMES: The Contribution to the Cosmic Infrared Background from Galaxies
  Selected by Mass and Redshift
  We quantify the fraction of the cosmic infrared background (CIB) that
originates from galaxies identified in the UV/optical/near-infrared by stacking
81,250 (~35.7 arcmin^2) K-selected sources (K_AB < 24.0), split according to
their rest-frame U - V vs. V - J colors into 72,216 star-forming and 9,034
quiescent galaxies, on maps from Spitzer/MIPS (24um), Herschel/SPIRE (250, 350,
500um), Herschel/PACS (100, 160um), and AzTEC (1100um). The fraction of the CIB
resolved by our catalog is (69 $\pm$ 15)% at 24um, (78 $\pm$ 17)% at 70um, (58
$\pm$ 13)% at 100um, (78 $\pm$ 18)% at 160um, (80 $\pm$ 17)% at 250um, (69
$\pm$ 14)% at 350um, (65 $\pm$ 12)% at 500um, and (45 $\pm$ 8)% at 1100um. Of
that total, about 95% originates from star-forming galaxies, while the
remaining 5% is from apparently quiescent galaxies. The CIB at $\lambda$ <
200um is sourced predominantly from galaxies at z < 1, while at $\lambda$ >
200um the bulk originates from 1 < z < 2. Galaxies with stellar masses log(M/
M_sun)=9.5-11 are responsible for the majority of the CIB, with those in the
log(M/ M_sun)=9.5-10 contributing mostly at $\lambda$ < 250um, and those in the
log(M/ M_sun)=10.5-11 bin dominating at $\lambda$ > 350um. The contribution
from galaxies in the log(M/ M_sun)=9.0-9.5 and log(M/ M_sun)=11.0-12.0 stellar
mass bins contribute the least, both of order 5%, although the highest
stellar-mass bin is a significant contributor to the luminosity density at z >
2. The luminosities of the galaxies responsible for the CIB shifts from a
combination of "normal" and luminous infrared galaxies (LIRGs) at $\lambda$ <
160um, to LIRGs at 160um < $\lambda$ < 500um, to finally LIRGs and
ultra-luminous infrared galaxies (ULIRGs) at $\lambda$ > 500um. Stacking
analyses were performed with SIMSTACK (available at
http://www.astro.caltech.edu/~viero/viero_homepage/toolbox.html) which accounts
for possible biases due to clustering.
