Morphology of the most massive galaxies in the early universe

Details Morphology of the most massive galaxies in the early universe Morphology of the most massive galaxies in the early universe

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8183m&link_type=abstract

HST Proposal ID #8183

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Hst Proposal Id #8183 Agn Hosts And Environment

Scientific paper

High redshift radio galaxies {HzRGs} are fundamentally important probes of galaxy and cluster formation. They are amongst the most massive galaxies in the early Universe and located in dense cluster environments. Our previous WFPC2 data have revealed that HzRGs are remarkably clumpy on a sub-kiloparsec scale, reminiscent of simulations of forming massive ellipticals. Surprisingly our NICMOS images often show clumpy aligned morphologies unlike those expected from an old elliptical population. There is a wide diversity in HST morphologies and colour distributions for the 9 objects for which we have both WFPC and NICMOS images. We propose to observe obtain WFPC2 images of 10 additional z 2 radio galaxies for which we have NICMOS but no WFPC2 images. The new data will be used to {i} determine the range of clumps colour distributions, thereby constraining the formation history and the nature of the radio/optical alignment effect {ii} compare them with the colours of Lyman-bre ak galaxies {iii} compare them with dust properties and the surmised axis of the jet orientation {iv} confirm relationships between clumpiness and other HzRG properties indicated by our present small sample. These observations will comprise part of a multiwavelength study of HzRGs, involving SCUBA on the JCMT as well as Keck and the VLT.

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