Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-22
Mon.Not.Roy.Astron.Soc. 346 (2003) L51
Astronomy and Astrophysics
Astrophysics
Accepted for MNRAS letters. 6 pages, 3 figures. Uses BoxedEPS (included)
Scientific paper
10.1111/j.1365-2966.2003.07305.x
We present the K-band Hubble diagrams (K-z relations) of sub-mm-selected galaxies and hyperluminous galaxies (HLIRGs). We report the discovery of a remarkably tight K-z relation of HLIRGs, indistinguishable from that of the most luminous radiogalaxies. Like radiogalaxies, the HLIRG K-z relation at z<~3 is consistent with a passively evolving ~3L* instantaneous starburst starting from a redshift of z~10. In contrast, many sub-mm selected galaxies are >~2 magnitudes 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 sub-mm-selected galaxies due to the 60 micron selection of some, so the location on the K-z relation may be related to the presence of the most massive AGN. Alternatively, a particular host galaxy mass range may be responsible for both extreme star formation and the most massive active nuclei.
Farrah Duncan
Fox Matt
Geach James
Kaviani Ali
Serjeant Stephen
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