ar X iv : a st ro - p h / 05 12 35 7 v 1 14 D ec 2 00 5 An investigation of the submillimeter background radiation using SCUBA and Spitzer
نویسندگان
چکیده
We investigate the redshift dependence of the contribution to the extragalactic farinfrared/sub-millimeter background from galaxies detected by the Spitzer Space Telescope at 8μm and 24μm. Using seven-band optical to mid-infrared photometry, we estimate photometric redshifts for the Spitzer sources which appear to be mostly L∗ galaxies at a median redshift of z = 1.0. These sources, extracted from deep 8μm and 24μm mosaics of the CUDSS 14-hour field with 5σ limits of 5.8μJy and 70μJy respectively, exhibit significant 850μm and 450μm emission as observed by SCUBA. At 850μm, after removing ≥ 4σ sources and those securely identified in our previous cross-matching paper, we measure stacked flux at the significance level of 4.4σ and 2.9σ from the full 8μm and 24μm galaxy catalogue respectively. At 450μm, flux is detected from all 8μm galaxies at the level of 3.5σ, while there is no significant emission from the 24μm galaxies. We find that the 850μm flux is emitted almost exclusively at z & 1.3 from the Spitzer sources with 0.44mJy (4.7σ) per 8μm source and 0.51mJy (2.8σ) per 24μm source. This corresponds to a contribution of (16± 3)% toward the 850μm extra-galactic background from the 8μm sources and (5.0 ± 1.8)% from the 24μm sources. At 450μm, only the 8μm sources within the redshift interval 1 < z < 2 exhibit significant emission with an average flux per source of 3.35mJy (3.0σ). This is a contribution of (37± 12)% to the 450μm background. Subject headings: infrared: galaxies
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