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Far-infrared spectroscopy of a lensed starburst: a blind redshift from Herschel

George, R. D., Ivison, R. J., Hopwood, R., Riechers, D. A., Bussmann, R. S., Cox, P., Dye, S., Krips, M., Negrello, M., Neri, R., Serjeant, S., Valtchanov, I., Baes, M., Bourne, N., Clements, D. L., De Zotti, G., Dunne, Loretta, Eales, Stephen Anthony, Ibar, E., Maddox, Steve, Smith, Matthew William L., Valiante, Elisabetta and van der Werf, P. 2013. Far-infrared spectroscopy of a lensed starburst: a blind redshift from Herschel. Monthly Notices of the Royal Astronomical Society: Letters 436 (1) , L99-L103. 10.1093/mnrasl/slt122

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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 (FTS). 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 Millimétrique'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 SPICA Far-infrared Instrument imaging spectrometer, proposed for the much more sensitive Space Infrared Telescope for Cosmology and Astrophysics mission, to determine redshifts of multiple dusty galaxies simultaneously without the benefit of lensing.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: galaxies: high-redshift; galaxies: starburst; infrared: galaxies; radio continuum: galaxies; radio lines: galaxies; submillimetre: galaxies
Publisher: Oxford University Press
ISSN: 1745-3925
Last Modified: 04 Jun 2017 05:50
URI: http://orca.cf.ac.uk/id/eprint/54032

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