Two bright submillimeter galaxies in a z=4.05 proto-cluster in GOODS-North, and accurate radio-infrared photometric redshifts - AstrophysicsReport as inadecuate




Two bright submillimeter galaxies in a z=4.05 proto-cluster in GOODS-North, and accurate radio-infrared photometric redshifts - Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We present the serendipitous discovery of z=4.05 molecular gas CO emissionlines with the IRAM Plateau de Bure interferometer coincident with GN20 andGN20.2, two luminous submillimeter galaxies SMGs in the Great ObservatoriesOrigins Deep Survey North field GOODS-N. These are among the most distantsubmillimeter-selected galaxies reliably identified through CO emission andalso some of the most luminous known. In terms of CO to bolometricluminosities, stellar mass and star formation rates SFRs, these newlydiscovered z>4 SMGs are similar to z~1.5-3 SMGs studied to date. These z~4 SMGshave much higher specific SFRs than typical B-band dropout Lyman break galaxiesat the same redshift. The stellar mass-SFR correlation for normal galaxies doesnot seem to evolve much further, between z~2 and z~4. A significant z=4.05spectroscopic redshift spike is observed in GOODS-N, and a strong spatialoverdensity of B-band dropouts and IRAC selected z>3.5 galaxies appears to becentered on the GN20 and GN20.2 galaxies. This suggests a proto-clusterstructure with total mass ~10^14 Msun. Using photometry at mid-IR, submm andradio wavelengths, we show that reliable photometric redshifts Dz-1+z~0.1can be derived for SMGs over 13.5 starbursts, regardless of theirsubmm-mm emission abridged.



Author: E. Daddi, H. Dannerbauer, D. Stern, M. Dickinson, G. Morrison, D. Elbaz, M. Giavalisco, C. Mancini, A. Pope, H. Spinrad

Source: https://arxiv.org/



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