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26 April 2024

» arxiv » 1308.4403

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Far-infrared spectroscopy of a lensed starburst: a blind redshift from Herschel
R. D. George ; R. J. Ivison ; R. Hopwood ; D. A. Riechers ; R. S. Bussmann ; P. Cox ; S. Dye ; M. Krips ; M. Negrello ; R. Neri ; S. Serjeant ; I. Valtchanov ; M. Baes ; N. Bourne ; D. L. Clements ; G. De Zotti ; L. Dunne ; S. A. Eales ; E. Ibar ; S. Maddox ; M. W. L. Smith ; E. Valiante ; P. van der Werf ;
Date:	20 Aug 2013
Abstract:	We report the redshift of HATLAS J132427.0+284452 (hereafter HATLAS J132427), a gravitationally lensed starburst galaxy, the first determined ’blind’ by the Herschel Space Observatory. This is achieved via the detection of [C II] consistent with z = 1.68 in a far-infrared spectrum taken with the SPIRE Fourier Transform Spectrometer. We demonstrate that the [C II] redshift is secure via detections of CO J = 2 - 1 and 3 - 2 using the Combined Array for Research in Millimeter-wave Astronomy and the Institut de Radioastronomie Millimetrique’s Plateau de Bure Interferometer. The intrinsic properties appear typical of high-redshift starbursts despite the high lensing-amplified fluxes, proving the ability of the FTS to probe this population with the aid of lensing. The blind detection of [C II] demonstrates the potential of the SAFARI imaging spectrometer, proposed for the much more sensitive SPICA mission, to determine redshifts of multiple dusty galaxies simultaneously without the benefit of lensing.
Source:	arXiv, 1308.4403
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