Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 591/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #17 Distant X−ray Galaxy Clusters Principal Investigator: Giovanni Fazio Institution: Harvard−Smithsonian Astrophysical Observatory Technical Contact: Peter Eisenhardt, JPL Science Category: galaxy clusters and groups Observing Modes: IracMap Hours Approved: 31.4 Abstract: We will measure the rest−frame 1.6um luminosity function of galaxies in x−ray selected clusters with z > 0.6. We expect to reach a depth of L*+4 at z=1. The sample consists of about 40 clusters with redshifts of up to 2.2, primarily selected from the Rosat Deep Cluster Survey, augmented by other clusters with z > 0.6 and known to have x−ray emission, and a few z > 1 clusters around radio galaxies for which the velocity dispersion or Faraday rotation implies a massive cluster is present. Locally, rest 1.6um emission correlates linearly with a galaxy’s dynamical mass. X−ray emission arises from the intracluster medium, which dominates the baryonic mass in local galaxy clusters. Hence the 1.6um luminosity function in x−ray selected clusters as a function of redshift can be usefully compared to models for the growth of structure. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 592/742 Spitzer Space Telescope − General Observer Proposal #50456 Probing Gas Stripping in Low−Redshift Groups and Clusters using Wide−Area 24−micron Imaging Principal Investigator: Rose Finn Institution: Siena College Technical Contact: Rose Finn, Siena College Co−Investigators: Michael Balogh, University of Waterloo Vandana Desai, Caltech Rebecca Koopmann, Union College Kenneth Rines, Harvard−Smithsonian Center for Astrophysics Gregory Rudnick, NOAO Dennis Zaritsky, University of Arizona Joannah Hinz, University of Arizona Bianca Poggianti, Padua Observatory Science Category: galaxy clusters and groups(low−z) Observing Modes: MipsScan Hours Approved: 35.5 Abstract: We propose to image a 1.42 degree by 2 degree (3.06Mpc x 4.33Mpc) region around 6 low−redshift galaxy groups and clusters using MIPS in scan mode. The primary goal of this proposal is to map the spatial distribution of star−formation within star−forming cluster galaxies as a function of the X−ray luminosity of their environments. By combining these new Spitzer observations with existing Spitzer archive observations of more massive local clusters, we will probe star−formation in environments that span the full range of X−ray luminosities. These observations will help determine the relative importance of galaxy−galaxy interactions, starvation, and ram−pressure stripping in driving the evolution of galaxies from blue to red. All clusters have extensive ancillary data including: multi−band photometry for all members and spectroscopy for 90% of cluster members from the Sloan Digital Sky Survey; HI observations covering the entire extent of the MIPS scan maps, giving a more detailed picture of the gas; and Chandra observations, which will help characterize the hot intra−cluster gas. Secondary science goals of these observations include: measuring the IR luminosity function for local clusters; providing a low−redshift baseline for the Spitzer observations of 0.4 < z < 1 clusters; and determining the bias in star−formation studies based on SDSS and 2dF spectroscopy. Thursday March 25, 2010 xgal_covers.txt 296/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 593/742 Spitzer Space Telescope − General Observer Proposal #20009 Integrated H−alpha and Far Infrared Star Formation Rates of High Redshift Galaxy Clusters Principal Investigator: Rose Finn Institution: Siena College Technical Contact: Rose Finn, Siena College Co−Investigators: Joannah Hinz, University of Arizona Dennis Zaritsky, University of Arizona Vandana Desai, IPAC Bianca Poggianti, University of Padova, Italy Claire Halliday, Max Planck Nicole Homeier, Johns Hopkins University Marc Postman, Space Telescope Science Institute Ken Rines, Yale University Science Category: galaxy clusters and groups Observing Modes: IracMap MipsPhot Hours Approved: 14.6 Abstract: We propose to study the evolution of star formation in galaxy cluster environments by pushing back measurements to the earliest epoch at which large samples of confirmed clusters exist, $z \\simeq 0.8$. We will measure the integrated star−formation rates (SFRs) for 12 $z \\simeq 0.8$ galaxy clusters using (1) MIPS 24 and 70 um photometry and (2) ground−based H−alpha imaging. Most importantly, the 12 $z \\simeq 0.8$ clusters span the full range in mass, from near−group environment to the most massive cluster. The 6 highest mass clusters in the sample are targets of Spitzer GTO cluster programs (PIs: Rieke, Fazio). We request 18.6 hours to complete matching MIPS and IRAC imaging of 6 optically−selected, lower−mass clusters to provide an essential complement to the ongoing Spitzer GTO observations of massive clusters at this redshift. We have found that H−alpha−derived star−formation rates depend on both cluster mass and redshift. Therefore, one must sample the full range of cluster masses to reach robust conclusions regarding evolution. By observing 6 lower mass clusters, we will provide the key systematic test of any results obtained using the GTO targets. Our H−alpha imaging has better spatial resolution and is 3 times more sensitive in terms of SFRs than our proposed MIPS observations, which will detect galaxies with SFRs of 1 M$_odot$/yr. However, H−alpha imaging alone will miss heavily obscured star−forming galaxies that are commonly associated with interactions, and the interaction rate in clusters is expected to increase with redshift. The IRAC imaging will assist in source identification in the MIPS data and will provide robust stellar masses to quantify the total past star formation. All the lower mass clusters have extensive ancillary data, including HST imaging and ground−based imaging and spectroscopy. These data will allow us to study the morphology−density−SFR relation as well as compare [OII]/H−alpha/far−IR SFRs for several hundred cluster galaxies. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 594/742 Spitzer Space Telescope − General Observer Proposal #30102 Star−Formation Rates of 9 Intermediate−Redshift Galaxy Clusters Principal Investigator: Rose Finn Institution: Siena College Technical Contact: Rose Finn, Siena College Co−Investigators: Gregory Rudnick, NOAO Dennis Zaritsky, University of Arizona Bianca Poggianti, University of Padova Bo Milvang−Jensen, Max−Planck Institut fur Extraterrestrische Physik Kenneth Rines, Yale University Science Category: galaxy clusters and groups Observing Modes: IracMap MipsPhot Hours Approved: 20.6 Abstract: In dense environments in the local universe, very few galaxies are currently forming stars, while galaxies in less dense environments are undergoing significant star formation. We are studying the star−formation properties of local and distant galaxy clusters in order to understand what causes the environmental variations in galaxy star−formation properties. This proposal targets 9 low−mass clusters at z = 0.5 in order to fill two significant gaps in current Spitzer studies of galaxy clusters. First, we will double the sample of clusters at z = 0.5. Second, our sample contains optically−selected, low−mass clusters, and current Spitzer programs target only the most massive, X−ray selected clusters at this redshift. Cluster star formation properties depend on both cluster mass and redshift. Therefore, one must sample the full range of cluster masses to reach robust conclusions regarding evolution. We request 20.6 hours to complete MIPS and IRAC imaging of the 9 clusters. We will measure star−formation rates of one solar mass per year from MIPS 24 and 70 um photometry. We will measure stellar mass and identify AGN using the IRAC data. All 9 clusters have extensive ground−based imaging and spectroscopy, and these additional data will maximize the scientific return of the Spitzer observations. Thursday March 25, 2010 xgal_covers.txt 297/371
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