Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 211/742 Spitzer Space Telescope − General Observer Proposal #30000 Gotcha! Using Swift GRBs to Pinpoint the Highest Redshift Galaxies Principal Investigator: Edo Berger Institution: Carnegie Observatories Technical Contact: Edo Berger, Carnegie Observatories Co−Investigators: Lennox Cowie, U. Hawaii Ranga−Ram Chary, Spitzer Science Center Shirnivas Kulkarni, Caltech Derek Fox, Pennsylvania State U. Paul Price, U. Hawaii Patrick McCarthy, Carnegie Institution of Washington Brian Schmidt, Australian National University Alicia Soderberg, Caltech Bradley Cenko, Caltech Michael Rauch, Carnegie Institution of Washington Michael Gladders, Carnegie Institution of Washington Amy Barger, U. Wisconson, Madison Bruce Peterson, Australian National University George Djorgovski, Caltech Eran Ofek, Caltech Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 20.4 Abstract: While there is convincing evidence that the Universe was reionized between redshifts of 6.5 and 15, the role of galaxies in this process is still not understood. Several star−forming galaxies at z~6 have been identified in recent deep, narrow−field surveys, but the expensive observations along with cosmic variance and contamination make it difficult to assess their contribution to reionization, or to significantly increase the sample. It has now been demonstrated that gamma−ray bursts (GRBs) exist at z>6, and we have already obtained HST and Spitzer observations of the host galaxy of GRB050904 at z=6.295 using our Cycle 14 program. GRBs have the advantage of being an uncontaminated signpost for star−formation, and their afterglows are sufficiently bright even at z>6 to allow photometric selection (via the Ly−alpha drop out technique) with 2−5 meter telescopes. Spectroscopic confirmation, including detailed information on the host ISM, is also likely (as demonstrated in the case of GRB050904). Using our approved TOO programs at an extensive range of facilities (2−5m telescopes up to Keck/Magellan/Gemini), we can rapidly find afterglows at z>6 and easily distinguish them from dusty low redshift bursts. This approach is highly efficient compared to current techniques, especially at z>7. Our large allocation on Keck/Magellan/Gemini will also be used to obtain spectroscopy of the afterglows and host galaxies. Here we request to continue our program of imaging GRB−selected z>6 galaxies with NICMOS (z>6), and Spitzer/IRAC to characterize their properties (SFR, age, morphology, extinction), and begin to address their role in reionization. These observations are requested as >2 month TOOs, allowing flexibility of scheduling and at the same time taking a unique and timely advantage of the exquisite performance of three of NASA’s premier missions. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 212/742 Spitzer Space Telescope − General Observer Proposal #3621 Galaxy mass functions and star formation rates in redshift 1.5 clusters Principal Investigator: Philip Best Institution: Institute for Astronomy Technical Contact: Philip Best, Institute for Astronomy Co−Investigators: Matt Lehnert, MPE−Garching George Miley, Sterrewacht Leiden Huub Rottgering, Sterrewacht Leiden Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 3.2 Abstract: We propose to obtain deep 4.5, 8 and 24 micron images of the central regions of two galaxy clusters at redshifts 1.5 for which we already possess a wealth of complementary optical, near−IR and HST data. These are amongst the highest redshift clusters known, and so offer a unique opportunity to address some of the key issues relating to the formation and evolution of the most massive galaxies. The goals of our proposed observations are to: 1. Accurately determine the stellar masses of the cluster galaxies, and hence the galaxy mass function of the cluster. In this way we will investigate the mass assembly epoch of massive cluster galaxies, which in turn places tight constraints upon models of galaxy formation. 2. Provide improved estimates of the stellar population ages of the passive cluster galaxies, and hence investigate the epoch at which their stars were formed. 3. Investigate the current star formation activity of the clusters. Is star formation suppressed in dense environments even at these high redshifts? When did the morphology−density relation set in? Are the star formation rates enhanced in the infalling regions? 4. Compare all of these results to both samples of field galaxies (from the legacy surveys) at the same redshift, in order to determine the effect of the cluster environment. Also, compare the results with lower redshift cluster samples in order to track the evolution over cosmic epoch. The proposed observations offer the only route to obtaining a complete census of the galaxy content and galaxy properties of these distant clusters, and hence to answering some of the fundamental questions concerning the formation and evolution of massive galaxies in clusters. Thursday March 25, 2010 xgal_covers.txt 106/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 213/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #268 Star Formation in High Redshift Clusters with Spitzer Principal Investigator: John Blackwell Institution: Grainer Observatory, Phillips Exeter Academy Technical Contact: Gregory Rudnick, NOAO Co−Investigators: Velvet Dowdy, Graves County High School Rosa Hemphill, Oregon Espiscopal School Ardis Herrold, Grosse Pointe North High School Thomas Loughran, Saint Joseph’s High School Dwight Taylor, South Anchorage High School Gregory Rudnick, NOAO Rose Finn, Siena College Vandana Desai, Caltech Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 2.5 Abstract: We propose to study the evolution of star formation in galaxy cluster environments by making measurements at epochs between 0.54 < z < 0.63. We will measure the integrated SFRs for three optically selected galaxy clusters from the ESO Distant Cluster Survey (EDisCS) using MIPS 24micron photometry. We will measure total past SFRs, i.e. stellar masses, from rest−frame near−infrared (near−IR) photometry obtained with IRAC. Two of the three galaxy clusters already have IRAC data. We propose taking new IRAC data for CL1232.5−1250 to complete the set. We have found that H_alpha−derived star−formation rates depend on both cluster mass and redshift (Finn et al. 2004, 2005a), demonstrating the necessity of sampling a large range in mass to disentangle evolutionary trends from trends in mass. Our three targeted clusters span the range in mass from near−group environment to the most massive cluster in the EDisCS sample. This mass range fills the gaps in existing studies, which are dominated by studies of field environments or of very massive clusters. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 214/742 Spitzer Space Telescope − General Observer Proposal #20081 Mid−IR spectroscopy of high−redshift ultraluminous dusty galaxies Principal Investigator: Andrew Blain Institution: Caltech Technical Contact: Andrew Blain, Caltech Co−Investigators: Scott Chapman, Caltech Ian Smail, University of Durham Lee Armus, Caltech/SSC David Frayer, Caltech/SSC David Alexander, University of Cambridge Rob Ivison, UKATC Harry Teplitz, Caltech/SSC Science Category: high−z galaxies (z>0.5) Observing Modes: IrsPeakupImage IrsStare Hours Approved: 90.0 Abstract: We propose deep IRS spectroscopy of a unique sample of 64 ultraluminous submillimeter−detected galaxies (SMGs) with known spectroscopic redshifts from 0.5 to 3.6. The median of their redshift distribution is z=2.4, spanning the peak epoch of massive galaxy formation activity and AGN fuelling. The SMG population certainly includes some of the most massive galaxies in the Universe. Much less common low−redshift galaxies with similar IR luminosities show a rich variety of mid−infrared(IR) gas and solid−phase spectroscopic features, revealing the physical conditions in the most active regions of these highly obscured systems, and especially the importance of AGN for powering their far−IR luminosity. The known redshifts and confirmed high luminosities will allow both the unambiguous interpretation of individual spectra, and a stacking analysis to reveal population−wide spectral features, as a function of color, magnitude and evolutionary state, as revealed by extensive multiwavelength data, including optical and near−IR imaging at HST resolution, and all a handful have archived or scheduled IRAC and MIPS imaging. IRS spectroscopy will contrast their mid−IR spectra with local analogs immune to the effects of dust extinction. For the subset of 21 targets with ultradeep X−ray data, we will be able to compare the relative power of X−ray and mid−IR diagnostics to reveal buried AGN activity. This ambitious IRS project will provide our first insight into the astrophysics of a large sample of ultraluminous galaxies spanning 80% of the lifetime of the Universe. Thursday March 25, 2010 xgal_covers.txt 107/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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