Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 599/742 Spitzer Space Telescope − General Observer Proposal #20626 Search for Infrared Emission from the Leo Extragalactic HI Cloud Principal Investigator: George Helou Institution: Caltech Technical Contact: George Helou, Caltech Co−Investigators: Yervant Terzian, Cornell University William Latter, SSC/Caltech Stephen Schneider, University of Massachussets Science Category: galaxy clusters and groups Observing Modes: IracMap MipsScan Hours Approved: 24.2 Abstract: We propose to map at 8, 24, 70 and 160um the one intergalactic HI cloud that has remained undetected at any wavelength other than the 21−cm HI line. The Leo Cloud was discovered serendipitously, and mapped subsequently in detail at both Arecibo and the VLA. The radio data reveal kinematic and spatial structure that rules out an origin as a recent tidal tail, leaving most likely the scenario that this is primordial, relatively pristine material. A detection of the dust emission from the Cloud would provide the only radiative manifestation other than HI, and would allow us to estimate the dust content of the Cloud, and therefore its metallicity. Even an upper limit would help constrain its origin and history. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 600/742 Spitzer Space Telescope − General Observer Proposal #20740 Life on the Edges: Morphological Transformation of Galaxies in Clusters of Galaxies at z=1 Principal Investigator: Bradford Holden Institution: University of California Observatories/Lick Observ Technical Contact: Bradford Holden, UCO/Lick Co−Investigators: Daniel Kelson, Observatories of the Carnegie Institution of Washi John Blakeslee, The Johns Hopkins University Marijn Franx, Leiden Observatory Garth Illingworth, University of California, Santa Cruz Marc Postman, Space Telescope Science Institute Kim−Vy Tran, ETH Science Category: galaxy clusters and groups Observing Modes: IracMap MipsPhot Hours Approved: 29.3 Abstract: Between a redshift of one and today, the mix of morphologies inside clusters of galaxies has changed. Both galaxy−galaxy mergers and passive processes have been proposed to explain this evolution. However, there is ample evidence that at z=1, clusters are still being formed out of infalling groups of galaxies. Therefore, these infalling groups are a likely location for the processes that drive morphological evolution. We propose for 15 by 15 arcminute mosaics using IRAC and MIPS in the vicinity of three z=0.8−0.9 clusters of galaxies. For each cluster, we have some or all of the HST ACS imaging required to measure the distribution of galaxy types and identify merger candidates. Our ongoing program of spectra and ground based imaging will determine the rest−frame optical properties and cluster membership. Spitzer’s unique window into the rest−frame near and mid−infrared will allow us to determine accurate stellar mass estimates and star formation rates, even for red galaxies with little optical evidence of any activity. With these data, we will answer the questions: (1) do the infalling galaxies have a sufficient stellar mass to become a typical z=0 cluster galaxy, (2) are the mergers we observe among the infalling galaxies "dry" or are they undergoing massive amounts of star formation, and (3) are the star formation histories of these infalling galaxies consistent with them becoming the massive systems dominated by old stellar populations that we see in clusters of galaxies today? Thursday March 25, 2010 xgal_covers.txt 300/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 601/742 Spitzer Space Telescope − General Observer Proposal #3521 Uncovering Galaxies and Star Formation in the Outskirts of Coma Principal Investigator: Ann Hornschemeier Institution: Johns Hopkins University Technical Contact: Ann Hornschemeier, Johns Hopkins University Co−Investigators: Bahram Mobasher, Space Telescope Science Institute David Alexander, Institute of Astronomy, Cambridge Timothy Heckman, Johns Hopkins University Science Category: galaxy clusters and groups Observing Modes: IracMap Hours Approved: 6.9 Abstract: Clusters of galaxies provide ideal environments for studies of galaxies due to the overdensities of all types of galaxies in a variety of environments. At a redshift of z=0.0228, Coma is the nearest rich cluster, a unique laboratory for studying evolution of galaxies. We select a 30 arcminute by 50 arcminute field located approximately one degree from the the center of Coma for moderate−depth IRAC imaging; the total requested AOR time is 6.9 hours. The Spitzer observations, combined with the available optical photometric and spectroscopic data as well as Chandra X−ray data will be used to uncover the galaxies missed in optical surveys, constructing a MIR luminosity function down to very low mass dwarf galaxies. We will also explore the infall regime and the effect of dust in forming different types of galaxies, and compare the star−formation rates estimated from X−ray and infrared data for a well calibrated sample. The IRAC exposure time is 108~seconds per field of view; we will detect very low luminosity dwarf galaxies. This dataset complements the Guaranteed Time programs of the Spitzer instrument teams, which focus on the center of Coma. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 602/742 Spitzer Space Telescope − General Observer Proposal #20253 Dusty Starbursts or Old, Red Galaxies in a Proto−Cluster at z ~ 2.4? Principal Investigator: Myungshin Im Institution: Seoul National University Technical Contact: Myungshin Im, Seoul National University Co−Investigators: Philip Choi, Spitzer Science Center James Colbert, Spitzer Science Center Dario Fadda, Spitzer Science Center Francine Marleau, Spitzer Science Center Matt Malkan, University of California, Los Angeles Giovanni Fazio, SAO/Center for Astrophysics Howard Smith, SAO/Center for Astrophysics Steve Willner, SAO/Center for Astrophysics Michael Pahre, SAO/Center for Astrophysics Science Category: galaxy clusters and groups Observing Modes: MipsPhot Hours Approved: 6.0 Abstract: We propose deep MIPS 24 micron imaging of galaxies near the z=2.39 radio galaxy 53W002. Recently, we have uncovered an unusually large number of very red galaxies with J−K > 2.7 mag in this field. This is the expected color for old, passively evolving galaxies near the same redshift as the radio galaxy. Our Keck spectroscopic data identify several galaxies near this redshift, including one of red ones. Evidently we are seeing a proto−cluster of galaxies formed at high redshift in an overdense region. Our Spitzer IRAC observations of the red galaxies show that their spectral energy distributions can be fit by old (>1 Gyr), early−type galaxies. According to hierarchical galaxy formation models, the formation of massive cluster galaxies occurs around z ~ 2 − 3, preceding the formation epoch of early−types in low density environment. Finding massive galaxies in an already evolved stage would challenge the hierarchical galaxy formation scenario. However, there is an alternate explanation for the observed SEDs: very dusty young galaxies, where the dust entirely hides the young stars. This scenario would support the hierarchical model. In order to answer the critical question of whether these red galaxies are old (zf > 4) or are dusty, we will obtain a deep 24 micron image of the field. If dust is not seen, it will rule out hidden star formation and pose a severe challenge to the hierarchical model. Our observation will also provide limits or measurements of the IR flux of other z ~ 2.4 galaxies in the field, such as submm galaxies and Lyman−alpha emitters, offering us a more complete view of the star formation history in an overdense region. Thursday March 25, 2010 xgal_covers.txt 301/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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