An investigation of the submillimeter background radiation using SCUBA and Spitzer

S. Dye, S. A. Eales, M. L.N. Ashby, J. S. Huang, T. M.A. Webb, P. Barmby, S. Lilly, M. Brodwin, H. McCracken, E. Egami, G. G. Fazio

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We investigate the redshift dependence of the contribution to the extragalactic far-infrared/submillimeter background from galaxies detected by the Spitzer Space Telescope at 8 and 24 μm. Using seven-band optical to midinfrared photometry, we estimate photometric redshifts for the Spitzer sources that appear to be mostly L* galaxies at a median redshift of z = 1.0. These sources, extracted from deep 8 and 24 μm mosaics of the CUDSS 14 hour field with 5 σ limits of 5.8 and 70 μJy, respectively, exhibit significant 850 and 450 μm emission as observed by SCUBA. At 850 μm, after removing >4 σ sources and those securely identified in our companion cross-matching paper, we measure stacked flux at the significance level of 4.4 and 2.9 σ from the full 8 and 24 μm galaxy catalog, respectively. At 450 μm, flux is detected from all 8 μm galaxies at the level of 3.5 σ, while there is no significant emission from the 24 μm galaxies. We find that the 850 μm flux is emitted almost exclusively at z ≳ 1.3 from the Spitzer sources with 0.44 mJy (4.7 σ) per 8 μm source, and 0.51 mJy (2.8 σ) per 24 μm source. This corresponds to a contribution of (16 ± 3)% toward the 850 μm extragalactic background from the 8 μm sources, and (5.0 ± 1.8)% from the 24 μm sources. At 450 μm, only the 8 μm sources within the redshift interval 1 < z < 2 exhibit significant emission with an average flux per source of 3.35 mJy (3.0 σ). This is a contribution of (37 ± 12)% to the 450 μ.m background.

Original languageEnglish (US)
Pages (from-to)769-777
Number of pages9
JournalAstrophysical Journal
Issue number2 II
StatePublished - Jun 10 2006


  • Diffuse radiation
  • Infrared: galaxies
  • Submillimeter

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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