Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 631/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30889 Detecting extended intracluster dust emission in Abell 2029 Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: George Rieke, The University of Arizona Co−Investigators: Lei Bai, University of Arizona Science Category: galaxy clusters and groups Observing Modes: MipsScan Hours Approved: 11.6 Abstract: Detecting dust in the hot intracluster gas has been a goal for a number of infrared missions. There are a number of tentative detections, but they are generally not confirmed with further observation. If interpreted as upper limits, the non−detection or the weak detection of this dust component by IRAS and ISO in many clusters suggests a strongly dust−depleted intracluster plasma, which is believed arises due to sputtering. Using MIPS 24 micron data for Abell 2029, we have detected a weak signal of this extended emission in the cluster core, coincident with the X−ray peak. Unlike previous studies, the resolution of MIPS allows us to remove the contributions of the cluster galaxies. Also, the instrument stability and the long baseline observation mode we used minimize the systematic error of the signal. Nonetheless, the detection is not solidly established. Therefore, we are asking for three times longer exposure time to achieve a secure detection of this extended dust emission. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 632/742 Spitzer Space Telescope − General Observer Proposal #40058 Evolution of Star Formation in the 400 Square Degree Galaxy Cluster Survey Principal Investigator: Kenneth Rines Institution: Smithsonian Astrophysical Observatory Technical Contact: Kenneth Rines, Smithsonian Astrophysical Observatory Co−Investigators: Rose Finn, Siena College Alexey Vikhlinin, Harvard−Smithsonian CfA Rodion Burenin, Space Research Institute (IKI), Moscow, Russia Thomas Reiprich, Institute for Astrophysics, Bonn University, Germa Allan Hornstrup, Danish National Space Center, Copenhagen, Denmark Harald Ebeling, Institute for Astronomy, Hawaii Hernan Quintana, P.U.C., Chile Science Category: galaxy clusters and groups(high−z) Observing Modes: IracMap MipsPhot Hours Approved: 25.1 Abstract: We propose to study the evolution of star formation in cluster galaxies using a sample that will be arguably the largest and best−studied representative sample of moderate−redshift X−ray clusters for the next decade. The star formation properties of cluster galaxies differ dramatically from field galaxies, but the reasons why remain unclear. Observations of individual clusters suggest that total cluster star formation rates depend on both redshift and cluster mass, but cluster−to−cluster variations are large. To overcome these variations, we propose a survey of clusters from one of the largest area deep X−ray cluster surveys, the 400 square degree survey. We will observe a mass−selected sample of moderate redshift clusters which are being observed in a large (1.8 Msec) Chandra project to probe dark energy. Spitzer observations are critical for measuring optically−obscured star formation, which can be a factor of 10−100 larger than total [OII] SFRs in moderate redshift cluster galaxies. Because clusters are effective gravitational lenses, the IRAC observations can also be used to probe high−redshift galaxies. These Spitzer observations will (1) provide a complete census of SFR in a large X−ray cluster sample, (2) determine the dependence of SFR on both redshift and cluster mass, (3) measure the size of cluster−to−cluster variations in SFR, (4) test the correlations between different tracers of SFR and their evolution, (5) provide important clues to the environmental dependence of star formation in galaxies, and (6) determine the potential impact of cluster galaxy evolution in using clusters as probes of dark energy. Part of this sample was approved in GO2; we propose to complete the sample. Thursday March 25, 2010 xgal_covers.txt 316/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 633/742 Spitzer Space Telescope − General Observer Proposal #20225 Evolution of Star Formation in the 400 Square Degree Galaxy Cluster Survey Principal Investigator: Kenneth Rines Institution: Yale University Technical Contact: Kenneth Rines, Harvard University Co−Investigators: Rose Finn, Siena College Alexy Vikhlinin, Harvard−CfA Rodion Burenin, Space Research Institute, Russia Thomas Reiprich, IfA, Bonn U. Allan Hornstrup, Danish National Space Center, Copenhagen Harald Ebeling, IfA, Hawaii Hernan Quintana, P.U.C. Chile Science Category: galaxy clusters and groups Observing Modes: IracMap MipsPhot Hours Approved: 25.3 Abstract: We propose to study the evolution of star formation in cluster galaxies using a sample that will be arguably the largest and best−studied sample of moderate−redshift X−ray clusters for the next decade. The star formation properties of cluster galaxies differ dramatically from field galaxies, but the reasons why are still unclear. Observations of individual clusters suggest that total cluster star formation rates depend on both redshift and cluster mass, but the cluster−to−cluster variations are large. To overcome these variations, we propose a survey of clusters from one of the largest area deep X−ray cluster surveys, the 400 square degree survey. We will observe a mass−selected sample of moderate redshift clusters which are being observed in a large (1 Msec) Chandra project to probe dark energy. Spitzer observations are critical for measuring optically−obscured star formation, which can be a factor of 10−100 larger than total [OII] SFRs in moderate redshift cluster galaxies. Because clusters are effective gravitational lenses, the IRAC observations can also be used to probe high−redshift galaxies. These Spitzer observations will (1) provide a complete census of SFR in a large X−ray cluster sample, (2) determine the dependence of SFR on both redshift and cluster mass, (3) test the correlations between different tracers of SFR and their evolution, (4) provide important clues to the environmental dependence of star formation in galaxies, and (5) determine the impact of cluster galaxy evolution in using clusters as probes of dark energy. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 634/742 Spitzer Space Telescope − General Observer Proposal #50733 Star formation in the Infall Regions of Intermediate Redshift Clusters Principal Investigator: Gregory Rudnick Institution: NOAO Technical Contact: Gregory Rudnick, NOAO Co−Investigators: Rose Finn, Siena College, USA Vandana Desai, Spitzer Science Center, USA Alfonso Aragon−Salamanca, Nottingham University, UK Bianca Poggianti, Padova Observatory, Italy Gabriella De Lucia, Max−Planck−Institute for Astrophysics, Germany Claire Halliday, Osservatorio Astrofisico di Arcetri, Italy Bo Milvang−Jensen, Niels Bohr Institute, Denmark Dennis Zaritsky, University of Arizona,USA Douglas Clowe, Ohio University, USA Pascale Jablonka, Geneva Observatory, Switzerland Steven Bamford, University of Portsmouth, UK Science Category: galaxy clusters and groups(high−z) Observing Modes: MipsScan Hours Approved: 28.3 Abstract: There are well known correlations between star formation and environment such that clusters have a much lower fraction of star forming galaxies than groups or the field. Clusters may therefore play an important role in supressing star formation in galaxies. Local studies have supported this scenario but have not been able to isolate the mechanisms that suppress star formation since the majority of galaxies in clusters have already ceased forming stars. To determine how clusters transform galaxies en masse it is necessary to catch the transformation "in the act". We propose panoramic MIPS 24 micron imaging of 7 well studied galaxy clusters at 0.55 < z < 0.8 drawn from the ESO Distant Cluster Survey (EDisCS). We will measure how the fraction of star forming galaxies depends on local galaxy density and on clustercentric distance, probing with one data set from the cluster cores, through the infall regions, and into the field. The requirements of this survey are influenced by our experience from EDisCS. It must have 1) observations at large lookback times when the galaxy population in clusters was rapidly evolving, 2) a large sample of clusters with a large range in velocity dispersion to determine the dependence of star forming galaxy fraction on cluster mass, 3) measurements to large clustercentric radii to probe local densities comparable to groups but in the vicinity of clusters, and 4) data at MIR wavelengths to measure SFR unbiased by dust obscuration. Our EDisCS clusters are the best studied systems at these redshifts, with optical and near infrared ground−based imaging, HST imaging, extensive deep VLT spectropscopy, XMM−Newton data, and deep IRAC and MIPS data, all on the central ~2.5 x 2.5 Mpc of each cluster. Most importantly, they are part of an extensive wide−−field spectroscopy program covering ~12Mpc x 12Mpc, which will yield unambiguous cluster membership and determinations of the local environment. Thursday March 25, 2010 xgal_covers.txt 317/371
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