Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 295/742 Spitzer Space Telescope − General Observer Proposal #20303 Exploring with far−infrared observations the most Luminous Mid−Infrared galaxies of the high redshift Universe Principal Investigator: Emeric Le Floc’h Institution: University of Arizona Technical Contact: Emeric Le Floc’h, U. Arizona Co−Investigators: Lee Armus, Caltech/SSC Matthew Ashby, CfA−Harvard Kate Brand, NOAO Vassilis Charmandaris, Cornell University Vandana Desai, Caltech/SSC Arjun Dey, NOAO Herve Dole, IAS−Orsay (France) Peter Eisenhardt, JPL Sarah Higdon, Cornell University Jim Higdon, Cornell University Buell Jannuzi, NOAO Casey Papovich, University of Arizona Dan Weedman, Cornell University Science Category: high−z galaxies (z>0.5) Observing Modes: MipsPhot Hours Approved: 14.0 Abstract: We propose to observe at 70 and 160microns a recently−discovered population of 20.5) Observing Modes: IrsStare Hours Approved: 18.5 Abstract: In the very recent years, deep cosmological surveys at infrared and submillimeter wavelengths have revealed the existence of a strongly evolving population of dust−enshrouded and luminous objects at high redshift. The activity of these sources mainly originates from star formation and can also be powered by accretion of matter around super massive black holes. Thus far, a critical step in understanding their role in the cosmic history has been the adoption of local spectral templates of luminous infrared galaxies as a foundation to infer the amount of their evolution. Yet, recent mid−infrared spectral results at redshifts z < 0.6 show a more complex interplay among star formation, AGN, and photo−dissociation regions that seriously challenge the use of local templates and correlations. This proposal aims to extend such spectral studies to higher redshifts (z ~ 0.6 to 1) and thus earlier lookback times, to assess the level and role of each of the processes. The unique capabilities of the recently−commissioned Spitzer Space Telescope provide unprecedented access to the nature of such objects. We therefore propose to perform IRS spectroscopy for a sample of luminous infrared galaxies at 0.6
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 297/742 Spitzer Space Telescope − General Observer Proposal #20706 Lyman Break Galaxies at z>5: Young Galaxies in a Young Universe? Principal Investigator: Matthew Lehnert Institution: Max Planck Institut fuer extraterrestrische Physik Technical Contact: Matthew Lehnert, MPE Co−Investigators: Malcolm Bremer, Bristol University Natascha Forster Schreiber, MPE Aprajita Verma, MPE Greg Rudnick, NOAO Alfonso Aragon−Salamanca, Nottingham, UK Guinevere Kauffmann, MPA Douglas Clowe, Steward Observatory Laura Douglas, Bristol Bo Milvang−Jensen, MPE Stephane Charlot, IAP/MPA Pascale Jablonka, Paris Observatory Meudon Claire Halliday, MPA Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 39.5 Abstract: Using SST Legacy IRAC data in the CDFS from GOODS and our own GO−1 IRAC data, we have found that z>5 Lyman Break Galaxies (LBGs) appear typically to have formed most of their stars over approximately a crossing time (5 galaxies in the 3.6, 4.5, 5.8 and 8.0 micron bands with IRAC. When combined with our existing deep optical data on these fields, we can determine the complete observed SEDs of the sources to 4.5 microns, and possibly to 8 microns (as we have done for the other fields). Using these SEDs we can determine approximate star formation histories, extinctions, photometric masses, and photometric redshifts for those sources for which we fail to get redshifts. This will allow us to determine: (1) if the galaxies contributed significantly to reionization which looks unlikely if reionization occurred at z~17 or we fail to begin to find significant numbers of galaxies older than 100 Myrs at these redshifts, (2) are likely to be driving winds and thus contribute significantly to the early metal−enrichment of the IGM, (3) the actual star−formation rate density at z~5.5, (4) how strongly the sources are correlated, refining their estimated duty cycle and bias, and many other issues of fundamental importance to cosmology. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 298/742 Spitzer Space Telescope − General Observer Proposal #50562 The nature of dark gamma−ray burst host galaxies Principal Investigator: Andrew Levan Institution: University of Warwick Technical Contact: Andrew Levan, University of Warwick Co−Investigators: Nial Tanvir, University of Leicester Jens Hjorth, Dark Cosmology Centre, Copenhagen Karl Svensson, University of Warwick Jose Maria Castro Ceron, Dark Cosmology Centre, Copenhagen Michal Michalowski, Dark Cosmology Centre, Copenhagen Pall Jakobsson, University of Hertfordshire Johan Fynbo, Dark Cosmology Centre, Copenhagen Daniele Malesani, Dark Cosmology Centre, Copenhagen Evert Rol, University of Leicester Darach Watson, Dark Cosmology Centre, Copenhagen Klaas Wiersema, University of Leicester Robert Priddey, University of Hertfordshire Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 13.3 Abstract: A fraction of gamma−ray bursts are dark in the optical and even in the nIR. These bursts, localised only via their X−ray afterglows probably include bursts in highly obscured, extreme star forming regions, and may originate from decidely different environments from optically bright gamma−ray bursts. We have an intensive programmeaimed at understanding these environments via studies of host galaxies. This includes approved time on Chandra, HST and the VLT. These facilities provide precise positions and characterize the optical magnitudes and morphologies of the host galaxies. However, strong discriminators between different host galaxy types lie in the mid−IR, where dust emission can be more directly probed. Here we propose to use Spitzer to study the host galaxies of bursts which show clear optical suppression. This will allow the construction of complete spectral energy distributions of these dark burst host galaxies, enable photometric redshifts to be determined for a fraction of the GRB host population not previously open to detailed study, and provide measures of dust content, stellar mass and star formation rates in these hosts. These observations will allow us to understand the environments of dark GRBs, how they relate to the bright bursts, and how the bulk GRB population traces starformation. Thursday March 25, 2010 xgal_covers.txt 149/371
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