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Session 10 - AGN - Host Galaxies & Environment.
Display session, Monday, January 13
Metropolitan Ballroom,
We report results of an r and K band imaging survey of radio-loud quasars (RLQs) at z=0.6--2.0.
It is known that the environments of luminous RLQs evolve rapidly with
redshift: at z=0.6 such RLQs are often found in Abell richness 0--1 clusters,
but at z<0.5 they are never found in such rich environments.
This indicates that the evolution of quasars is tied to their environments.
The outstanding feature of quasar evolution is the huge decline in space density
from z=2 to z=0, but almost nothing is known of quasar environments at z>0.7.
To investigate RLQ environments to high redshift and to assemble and study a
sample of high-redshift galaxies, we have searched for galaxies and clusters
around a carefully selected sample of RLQs with 0.6 These candidate z\sim1.5 clusters are being studied in detail with
ongoing multicolor imaging, upcoming optical and IR spectroscopy,
and proposed HST observations.
These data will provide photometric and spectroscopic redshifts
and will measure the color, color-magnitude slope, and
scatter in the `red envelope' of early-type galaxies in the color-magnitude
diagram and thus constrain the formation epoch, differential evolution, and
coevality of such galaxies, respectively,
within a cluster and between different clusters at z\sim1.5.
These z\sim1.5 cluster candidates provide excellent tests of the coevality
of early-type cluster galaxies, since such tests are more sensitive the closer
to the formation epoch they are performed.
The author(s) of this abstract have provided an email address for comments about the abstract: pathall@as.arizona.edu
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