NOAO > Observing Info > Approved Programs > 2010B-0193
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NOAO > Observing Info > Approved Programs > 2010B-0193 |
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PI: Dara Norman, NOAO, dnorman@noao.edu
Address: PO Box 26732, 950 North Cherry Avenue, Tucson, AZ 85726-6732, USA
CoI: Georgina Coldwell, nstituto de Ciencias Astron?micas, de la Tierra y del Espacio (ICATE)- CONICET, San Juan, Argentina
CoI: Ilona Soechting, Oxford University
Title: X-ray selected AGN in a Merging Cluster Environment
Abstract:
Although a general understanding of the overall AGN population is being
addressed by optical large area surveys, a complete picture of cluster AGN is
hampered by survey biases and a lack of information about AGN environments
where we can trace cluster interactions. Optically selected AGN are
under-represented in cluster environments due to color selection criteria
insensitive to red and dusty sources. X-ray selection of AGN can overcome
this bias.
Hierarchical simulations suggest the gravitational processes which govern the
evolution of clusters also have a role in AGN triggering, and AGN feedback is
critically important to galaxy evolution. Confirmation of models requires
comparisons not just of the cluster galaxy population, but also of the
distributions of AGN in clusters especially forming clusters, which are not
fully identified in surveys. Weak lensing cluster selection can overcome this
bias.
We propose to obtain GMOS-S spectra for a sample of 23 X-ray selected ,
optically faint (20 with R>20.3) AGN cluster candidates in an X-ray cluster
discovered by its weak lensing shear signal. This cluster is unique in the
large number of 1) X-ray AGN candidates identified in its environment and 2)
X-ray sub-clusters identified. We require redshift data to identify AGN
cluster members.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360
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NOAO > Observing Info > Approved Programs > 2010B-0193 |
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