Star Formation Rates in Lyman Break Galaxies: Radio Stacking of LBGs in the COSMOS Field and the Sub-μJy Radio Source Population (original) (raw)

2008, The Astrophysical …

We present an analysis of the radio properties of large samples of Lyman Break Galaxies (LBGs) at z ∼ 3, 4, and 5 from the COSMOS field. The median stacking analysis yields a statistical detection of the z ∼ 3 LBGs (U-band dropouts), with a 1.4 GHz flux density of 0.90 ± 0.21µJy. The stacked emission is unresolved, with a size < 1", or a physical size < 8kpc. The total star formation rate implied by this radio luminosity is 31 ± 7 M ⊙ year −1 , based on the radio-FIR correlation in low redshift star forming galaxies. The star formation rate derived from a similar analysis of the UV luminosities is 17 M ⊙ year −1 , without any correction for UV dust attenuation. The simplest conclusion is that the dust attenuation factor is 1.8 at UV wavelengths. However, this factor is considerably ⋆ Based on observations in the COSMOS Legacy Survey including those taken on the HST, Keck, NRAO-VLA, Subaru, KPNO 4m, CTIO 4m, and CFHT 3.6m.

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