Extragalactic abstracts - IRSA - California Institute of Technology
Extragalactic abstracts - IRSA - California Institute of Technology
Extragalactic abstracts - IRSA - California Institute of Technology
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Spitzer_Approved_<strong>Extragalactic</strong><br />
Mar 25, 10 16:24 Page 591/742<br />
Spitzer Space Telescope − Guaranteed Time Observer Proposal #17<br />
Distant X−ray Galaxy Clusters<br />
Principal Investigator: Giovanni Fazio<br />
Institution: Harvard−Smithsonian Astrophysical Observatory<br />
Technical Contact: Peter Eisenhardt, JPL<br />
Science Category: galaxy clusters and groups<br />
Observing Modes: IracMap<br />
Hours Approved: 31.4<br />
Abstract:<br />
We will measure the rest−frame 1.6um luminosity function <strong>of</strong> galaxies in x−ray<br />
selected clusters with z > 0.6. We expect to reach a depth <strong>of</strong> L*+4 at z=1. The<br />
sample consists <strong>of</strong> about 40 clusters with redshifts <strong>of</strong> up to 2.2, primarily<br />
selected from the Rosat Deep Cluster Survey, augmented by other clusters with z<br />
> 0.6 and known to have x−ray emission, and a few z > 1 clusters around radio<br />
galaxies for which the velocity dispersion or Faraday rotation implies a massive<br />
cluster is present. Locally, rest 1.6um emission correlates linearly with a<br />
galaxy’s dynamical mass. X−ray emission arises from the intracluster medium,<br />
which dominates the baryonic mass in local galaxy clusters. Hence the 1.6um<br />
luminosity function in x−ray selected clusters as a function <strong>of</strong> redshift can be<br />
usefully compared to models for the growth <strong>of</strong> structure.<br />
Spitzer_Approved_<strong>Extragalactic</strong><br />
Printed_by_SSC<br />
Mar 25, 10 16:24 Page 592/742<br />
Spitzer Space Telescope − General Observer Proposal #50456<br />
Probing Gas Stripping in Low−Redshift Groups and Clusters using Wide−Area<br />
24−micron Imaging<br />
Principal Investigator: Rose Finn<br />
Institution: Siena College<br />
Technical Contact: Rose Finn, Siena College<br />
Co−Investigators:<br />
Michael Balogh, University <strong>of</strong> Waterloo<br />
Vandana Desai, Caltech<br />
Rebecca Koopmann, Union College<br />
Kenneth Rines, Harvard−Smithsonian Center for Astrophysics<br />
Gregory Rudnick, NOAO<br />
Dennis Zaritsky, University <strong>of</strong> Arizona<br />
Joannah Hinz, University <strong>of</strong> Arizona<br />
Bianca Poggianti, Padua Observatory<br />
Science Category: galaxy clusters and groups(low−z)<br />
Observing Modes: MipsScan<br />
Hours Approved: 35.5<br />
Abstract:<br />
We propose to image a 1.42 degree by 2 degree (3.06Mpc x 4.33Mpc) region around<br />
6 low−redshift galaxy groups and clusters using MIPS in scan mode. The primary<br />
goal <strong>of</strong> this proposal is to map the spatial distribution <strong>of</strong> star−formation<br />
within star−forming cluster galaxies as a function <strong>of</strong> the X−ray luminosity <strong>of</strong><br />
their environments. By combining these new Spitzer observations with existing<br />
Spitzer archive observations <strong>of</strong> more massive local clusters, we will probe<br />
star−formation in environments that span the full range <strong>of</strong> X−ray luminosities.<br />
These observations will help determine the relative importance <strong>of</strong> galaxy−galaxy<br />
interactions, starvation, and ram−pressure stripping in driving the evolution <strong>of</strong><br />
galaxies from blue to red. All clusters have extensive ancillary data including:<br />
multi−band photometry for all members and spectroscopy for 90% <strong>of</strong> cluster<br />
members from the Sloan Digital Sky Survey; HI observations covering the entire<br />
extent <strong>of</strong> the MIPS scan maps, giving a more detailed picture <strong>of</strong> the gas; and<br />
Chandra observations, which will help characterize the hot intra−cluster gas.<br />
Secondary science goals <strong>of</strong> these observations include: measuring the IR<br />
luminosity function for local clusters; providing a low−redshift baseline for<br />
the Spitzer observations <strong>of</strong> 0.4 < z < 1 clusters; and determining the bias in<br />
star−formation studies based on SDSS and 2dF spectroscopy.<br />
Thursday March 25, 2010 xgal_covers.txt<br />
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