Properties of Candidate Cluster Galaxies at z=1--2

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dc.creatorHall, Patrick B.
dc.date1998-12-10
dc.date.accessioned2026-07-07T02:29:34Z
dc.date.available2026-07-07T02:29:34Z
dc.descriptionI discuss the properties of a population of candidate cluster galaxies recently identified in the fields of radio-loud quasars at z=1--2. The magnitude, spatial, and color distributions of the excess galaxies in these fields are consistent with the quasars residing in moderately rich galaxy overdensities dominated by early-type galaxies. The broadband SEDs of very red galaxies in several fields suggest that there is considerable dispersion in the properties of early-type galaxies in these clusters at z~1.5. Most excess galaxies are best fit as 2--3 Gyr old ellipticals, but some are either 4--5 Gyr old or considerably more metal-rich, and others must be extremely dusty. The latter are part of a ``J-band dropout'' population which includes a number of galaxies in one field which are probably at z~2.5, background to the quasar. Finally, I discuss narrowband redshifted H-alpha imaging in two fields which has yielded at least one detection. At z>1.3 cluster galaxy star formation rates can be measured from H-alpha in the near-IR, rest-frame 1500-Angstrom light in the optical, and eventually rest-frame far-IR emission using SCUBA, to help determine the star formation histories of cluster galaxies as function of redshift.
dc.description10 pages, 9 figures. Talk given in October 1998 at the 13th Kingston Meeting on Theoretical Astrophysics: Galaxy Formation and Cosmic Star Formation History. Also available from http://www.astro.utoronto.ca/~hall/kingston.ps.gz
dc.identifierhttps://arxiv.org/abs/astro-ph/9812195
dc.identifierhttp://arxiv.org/abs/astro-ph/9812195
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13525
dc.subjectAstrophysics
dc.titleProperties of Candidate Cluster Galaxies at z=1--2
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