Journal Article

The <i>K</i>-band Hubble diagram of submillimetre galaxies and hyperluminous galaxies

Stephen Serjeant, Duncan Farrah, James Geach, Toshinobu Takagi, Aprajita Verma, Ali Kaviani and Matt Fox

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 346, issue 4, pages L51-L56
Published in print December 2003 | ISSN: 0035-8711
Published online December 2003 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2003.07305.x
The K-band Hubble diagram of submillimetre galaxies and hyperluminous galaxies

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Abstract

We present the K-band Hubble diagrams (Kz relations) of submillimetre-selected galaxies and hyperluminous galaxies (HLIRGs). We report the discovery of a remarkably tight Kz relation of HLIRGs, indistinguishable from that of the most luminous radio galaxies. Like radio galaxies, the HLIRG Kz relation at z≲ 3 is consistent with a passively evolving ∼3L* instantaneous starburst starting from a redshift of z∼ 10. In contrast, many submillimetre-selected galaxies are ≳2 mag fainter, and the population has a much larger dispersion. We argue that dust obscuration and/or a larger mass range may be responsible for this scatter. The galaxies so far proved to be hyperluminous may have been biased towards higher AGN bolometric contributions than submillimetre-selected galaxies due to the 60-μm selection of some, so the location on the Kz relation may be related to the presence of the most massive active galactic nucleus. Alternatively, a particular host galaxy mass range may be responsible for both extreme star formation and the most massive active nuclei.

Keywords: galaxies: evolution; galaxies: formation; galaxies: starburst; cosmology: observations; infrared: galaxies; submillimetre

Journal Article.  4168 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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