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26 April 2024 |
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The K-band Hubble diagram of sub-mm galaxies and hyperluminous galaxies | | Stephen Serjeant
; Duncan Farrah
; James Geach
; Toshinobu Takagi
; Aprajita Verma
; Ali Kaviani Matt Fox
; | | Date: |
22 Oct 2003 | | Journal: | Mon.Not.Roy.Astron.Soc. 346 (2003) L51 | | Subject: | astro-ph | | Affiliation: | Kent), Duncan Farrah (IPAC), James Geach (Imperial), Toshinobu Takagi (Kent), Aprajita Verma (MPI), Ali Kaviani (Imperial) Matt Fox (Imperial | | Abstract: | 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. | | Source: | arXiv, astro-ph/0310661 | | Services: | Forum | Review | PDF | Favorites | |
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