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HerMES: The contribution to the cosmic infrared background from galaxies selected by mass and redshift

  • Author(s): Viero, MP
  • Moncelsi, L
  • Quadri, RF
  • Arumugam, V
  • Assef, RJ
  • Béthermin, M
  • Bock, J
  • Bridge, C
  • Casey, CM
  • Conley, A
  • Cooray, A
  • Farrah, D
  • Glenn, J
  • Heinis, S
  • Ibar, E
  • Ikarashi, S
  • Ivison, RJ
  • Kohno, K
  • Marsden, G
  • Oliver, SJ
  • Roseboom, IG
  • Schulz, B
  • Scott, D
  • Serra, P
  • Vaccari, M
  • Vieira, JD
  • Wang, L
  • Wardlow, J
  • Wilson, GW
  • Yun, MS
  • Zemcov, M
  • et al.
Abstract

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 versus V-J colors into 72,216 star-forming and 9034 quiescent galaxies, on maps from Spitzer/MIPS (24 μm), Herschel/PACS (100, 160 μm), Herschel/SPIRE (250, 350, 500 μm), and AzTEC (1100 μm). The fraction of the CIB resolved by our catalog is (69% ± 15%) at 24 μm, (78% ± 17%) at 70 μm, (58% ± 13%) at 100 μm, (78% ± 18%) at 160 μm, (80% ± 17%) at 250 μm, (69% ± 14%) at 350 μm, (65% ± 12%) at 500 μm, and (45% ± 8%) at 1100 μm. Of that total, about 95% originates from star-forming galaxies, while the remaining 5% is from apparently quiescent galaxies. The CIB at λ ≲ 200 μm appears to be sourced predominantly from galaxies at z ≲ 1, while at λ ≳ 200 μm the bulk originates from 1 ≲ z ≲ 2. Galaxies with stellar masses log(M/M ) = 9.5-11 are responsible for the majority of the CIB, with those in the log(M/M ) = 9.5-10 bin contributing mostly at λ < 250 μm, and those in the log(M/M ) = 10-11 bin dominating at λ > 350 μm. The contribution from galaxies in the log(M/M ) = 9.0-9.5 (lowest) and log(M/M ) = 11.0-12.0 (highest) 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 combinations of "normal" and luminous infrared galaxies (LIRGs) at λ ≲ 160 μm, to LIRGs at 160 ≲ λ ≲ 500 μm, to finally LIRGs and ultra-luminous infrared galaxies at λ ≳ 500 μm. Stacking analyses were performed using SIMSTACK, a novel algorithm designed to account for possible biases in the stacked flux density due to clustering. It is made available to the public at www.astro.caltech.edu/∼viero/viero-homepage/ toolbox.html. © 2013. The American Astronomical Society. All rights reserved..

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