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Astrophysics Luncheon Seminar

Clusters Around Radio-Loud AGN as Seen by Spitzer
Presented by Dominika Wylezalek
Jet Propulsion Laboratory, California Institute of Technology

Monday, February 4, 2013
12:00 noon in 169-336

Powerful high redshift radio-loud AGN, are known to preferentially lie in overdense fields and are therefore promising beacons for identifiying large-scale structure at high redshift. A dozen of (proto)-clusters has been confirmed to date at z>1.2 in the fields of radio-loud AGN - in particular radio galaxies. However, due to the relatively small number of confirmed clusters, it is still challenging to draw a clear picture of formation and evolution in high redshift clusters. It is still also under debate whether the cluster environment depends on the type of targeted radio-loud AGN. I will present first results of our large Spitzer snapshot program, CARLA (Clusters Around Radio-Loud AGN; P.I.: D. Stern), that is currently targeting over 400 radio-loud AGN (~200 radio galaxies and ~200 radio-loud quasars) at 1.31.4 have already been standing out of the sample and scheduled for follow-up. Having at least 150 very overdense fields at hand that are likely to host protoclusters we can constrain the near-IR luminosity funtion for galaxy clusters at z > 1.3 and measure the evolution of the faint end slope and m*.

SVCP Astrophysics

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