Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 347/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #293 The nature of JD0910+46: a candidate z~10 galaxy Principal Investigator: Nial Tanvir Institution: U. Leicester Technical Contact: Nial Tanvir, U. Leicester Co−Investigators: Andrew Levan, University of Warwick James Rhoads, Arizona State University Andrew Fruchter, Space Telescope Science Institute Malcolm Bremer, University of Bristol Robert Priddey, University of Hertfordshire Jens Hjorth, University of Copenhagen Evert Rol, University of Leicester Pall Jakobsson, University of Hertfordshire Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 2.2 Abstract: The earliest galaxies in the Universe should have formed at very high redshifts, z>10, based both on models of hierarchical structure formation, and on observations of the microwave background polarization by WMAP that require significant ionization of the intergalactic medium before z=10. However, direct observation of sources at z>7 remains highly challenging due to their scarcity and faintness. We recently identified a bright, spatially extended J−band dropout, JD0910+46, that is an promising candidate for a z>10 galaxy. Its spectral energy distribution is more extreme than any previously reported: It is undetected in J, with a very red J−H color, yet is quite blue in H−K. It appears to be the best candidate to date for a z>10 galaxy: These colors are natural for a Lyman break, but model SEDs of either "old" or dusty galaxies at more moderate redshifts (z~3) cannot easily reproduce the observed combination of red J−H and blue H−K color. Yet we do not feel the case for z>10 can be adequately resolved with existing optical and NIR data alone. Spitzer/IRAC photometry will convincingly distinguish between different models and so elucidate the nature of this remarkable source. Should it turn out to be at a lower redshift it will provide an important example of the kinds of interloper which may contaminate samples of high−z candidates based on the dropout technique. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 348/742 Spitzer Space Telescope − General Observer Proposal #20599 16 micron Imaging of GOODS North Principal Investigator: Harry Teplitz Institution: Spitzer Science Center Technical Contact: Harry Teplitz, Spitzer Science Center Co−Investigators: Mark Dickinson, NOAO Ranga Chary, SSC David Elbaz, CEA Saclay James Colbert, SSC Brian Siana, UCSD Delphine Marcillac, CEA Saclay Casey Papovich, UA Emeric Le Floc’h, UA David Koo, UCSC Andrew Phillips, UCO/Lick Science Category: high−z galaxies (z>0.5) Observing Modes: IrsPeakupImage Hours Approved: 38.1 Abstract: We propose to obtain 16 micron imaging of the entire Northern GOODS field (150 square arcmin) to a depth of 33 microJy (3sigma) using the IRS Blue Peak Up imaging capability. These data will fill in the gap in wavelength coverage between the IRAC 8 micron and the MIPS 24 micron imaging of the field. Deep 16 micron data is needed in order to disentangle the combined influences of the 9.7 micron silicate absorption feature and warm dust continuum which fall in the 24 micron filter at 1
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 349/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #252 Ultradeep IRS Spectroscopy in GOODS South Principal Investigator: Harry Teplitz Institution: Spitzer Science Center Technical Contact: Lee Armus, Spitzer Science Center Co−Investigators: Lee Armus, SSC Ranga−Ram Chary, SSC David Frayer, SSC Andrew Blain, Caltech Henrik Spoon, Cornell University Vassilis Charmandaris, Univ. of Crete Alexandra Pope, University of British Columbia Douglas Scott, University of British Columbia Ski Antonucci, UCSB Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap IrsStare Hours Approved: 31.6 Abstract: Currently approved (GO−2) spectroscopic Spitzer surveys of sub−mm sources are limited to flux densities brighter than f_24~0.3 mJy. To study the dominant population of IR−luminous galaxies (10^11 − 10^12 Lsun at 11 sources in GOODS and other deep surveys as well. We will measure the global density of dust enshrouded star formation at its apparent peak near z=1. The dataset will also be applicable to a broad range of other topics including the correlation of SFR with merger activity and the search for highly extincted AGN. Some effort by the team will be required to reduce the non−standard 16 micron data. We will release fully calibrated mosaics through the GOODS multi−observatory data archive. Thursday March 25, 2010 xgal_covers.txt 175/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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