A Redshift Survey of Herschel Far-Infrared Selected Starbursts and   Implications for Obscured Star Formation

C.M. Casey (1); S. Berta (2); M. B\'ethermin (3,4); J. Bock (5,6); C.; Bridge (5); J. Budynkiewicz (1,7); D. Burgarella (8); E. Chapin (9,10); S.C.; Chapman (11,12); D.L. Clements (13); A. Conley (14); C.J. Conselice (15); A.; Cooray (16,5); D. Farrah (17); E. Hatziminaoglou (18); R.J. Ivison (19,20),; E. Le Floc'h (3); D. Lutz (2); G. Magdis (3,21); B. Magnelli (2); S.J. Oliver; (22); M.J. Page (23); F. Pozzi (24); D. Rigopoulou (21,25); L. Riguccini; (3,26); I.G. Roseboom (22,20); D.B. Sanders (1); D. Scott (9); N. Seymour; (23,27); I. Valtchanov (10); J.D. Vieira (5); M. Viero (5); J. Wardlow (16); ((1) Hawaii; (2) MPE; (3) Saclay; (4) IAS; (5) Caltech; (6) JPL; (7) UMass,; (8) Marseille; (9) UBC; (10) ESAC; (11) Cambridge; (12) Dalhousie; (13); Imperial; (14) Colorado; (15) Nottingham; (16) UCI; (17) Virginia Tech; (18); ESO; (19) UKATC; (20) Edinburgh; (21) Oxford; (22) Sussex; (23) MSSL; (24); Bologna; (25) RAL; (26) NASA Ames; (27) CSIRO)

arXiv:1210.4928·astro-ph.CO·June 11, 2015

A Redshift Survey of Herschel Far-Infrared Selected Starbursts and Implications for Obscured Star Formation

C.M. Casey (1), S. Berta (2), M. B\'ethermin (3,4), J. Bock (5,6), C., Bridge (5), J. Budynkiewicz (1,7), D. Burgarella (8), E. Chapin (9,10), S.C., Chapman (11,12), D.L. Clements (13), A. Conley (14), C.J. Conselice (15), A., Cooray (16,5), D. Farrah (17)

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TL;DR

This study provides spectroscopic redshifts for Herschel-selected starburst galaxies, revealing their distribution, properties, and significance for understanding obscured star formation and galaxy evolution over cosmic time.

Contribution

It offers the first large spectroscopic sample of Herschel-selected starbursts, improving redshift accuracy and insights into their role in cosmic star formation history.

Findings

01

Most Herschel-selected galaxies are at z<2.

02

Significant discrepancy between photometric and spectroscopic redshifts.

03

Herschel galaxies contribute substantially to star formation at z<1.6.

Abstract

We present Keck spectroscopic observations and redshifts for a sample of 767 Herschel-SPIRE selected galaxies (HSGs) at 250, 350, and 500um, taken with the Keck I Low Resolution Imaging Spectrometer (LRIS) and the Keck II DEep Imaging Multi-Object Spectrograph (DEIMOS). The redshift distribution of these SPIRE sources from the Herschel Multitiered Extragalactic Survey (HerMES) peaks at z=0.85, with 731 sources at z<2 and a tail of sources out to z~5. We measure more significant disagreement between photometric and spectroscopic redshifts (<delta_z>/(1+z)>=0.29) than is seen in non-infrared selected samples, likely due to enhanced star formation rates and dust obscuration in infrared-selected galaxies. We estimate that the vast majority (72-83%) of z<2 Herschel-selected galaxies would drop out of traditional submillimeter surveys at 0.85-1mm. We estimate the luminosity function and…

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