Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 223/742 Spitzer Space Telescope − General Observer Proposal #40599 Unveiling the Galaxy Counterparts of Damped Lyman−alpha Absorbers using GRB−DLAs Principal Investigator: Ranga−Ram Chary Institution: California Institute of Technology Technical Contact: Ranga−Ram Chary, California Institute of Technology Co−Investigators: Edo Berger, Carnegie Institute of Washington Andrew Blain, Caltech George Djorgovski, Caltech Shrinivas Kulkarni, Caltech Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 77.4 Abstract: Damped Lyman−alpha systems (DLAs) have primarily been detected along the line of sight to bright quasars (QSOs) through absorption line spectroscopy. They harbor the bulk of the neutral gas in the Universe between redshifts of 05 redshift solutions which indicate that they are extremely massive galaxies with stellar masses exceeding 1E11 Msun. If true, these galaxies contribute the bulk of the stellar mass density at z~6 and the past star−formation in these galaxies is responsible for reionizing the intergalactic medium at z>>6. The majority of these galaxies have however found to be faint 24 micron sources which would instead suggest that they are luminous infrared galaxies (LIRGs) with L(IR)~3E11 Lsun at z~2. We propose ultradeep Spitzer/IRS LL spectroscopy which will measure the redshifts of two representative, optically invisible (i>27 mag) sources in this class and distinguish between these two widely disparate hypotheses. The detection of polycyclic aromatic hydrocarbons (PAH) in the spectra of these sources would imply that photometric redshifts of dusty infrared luminous galaxies are unreliable − a fundamental obstacle in estimating the comoving luminosity density of the Universe as a function of redshift. It would allow the shape of the dust extinction curve to be constrained and rule out the Balmer−"break" color selection as a reliable tracer of redshift. By virtue of being the deepest IRS/LL observations, it would yield the first measures of PAH line strengths in high redshift LIRGs. This will help refine the mid−infrared PAH templates that are used to estimate bolometric luminosities of galaxies detected in various mid−infrared surveys, including those which will be undertaken by WISE. The absence of PAH in the proposed spectra would imply the presence of Compton−thick AGN and/or confirm that we have identified the galaxies responsible for reionization without the need for changing the stellar initial mass function at high redshift. Spitzer offers the only opportunity to resolve this important conundrum until the James Webb Space Telescope. Thursday March 25, 2010 xgal_covers.txt 112/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 225/742 Spitzer Space Telescope − General Observer Proposal #30600 Solving the Mystery of the Lyman Alpha Blobs Principal Investigator: James Colbert Institution: Spitzer Science Center Technical Contact: James Colbert, Spitzer Science Center Co−Investigators: Harry Teplitz, Spitzer Science Center Brian Siana, Spitzer Science Center Paul Francis, Australian National University Bruce Woodgate, Goddard Space Flight Center Povilas Palunas, University of Texas at Austin Gerard Williger, University of Louisville Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap MipsPhot Hours Approved: 30.4 Abstract: We propose IRS Long Low and MIPS 24 micron imaging of all the Ultraluminous Infrared Galaxies (ULIRGs) associated with high−redshift, Lyman alpha blobs (LABs). The physical origin of the LABs is still unknown, with the two most likely models shocks from supernova−driven winds and escaping AGN illumination. Only with mid−infrared spectroscopy can we definitively measure the PAH strengths and PAH−to−continuum ratios of these UV−bright ULIRGS, quantifying the relative contributions of AGN versus starburst. We will also be sensitive to the broad 9.7 micron silicate feature, which can be used to estimate extinction to the embedded mid−IR sources. Half of all known LAB ULIRGs lie at z=3.09, moving the majority of strong PAH features out the 24 micron filter. None of these z=3.09 LABs have been detected at 24 micron, despite SCUBA 850 micron detections, so for this half of the sample we propose deep MIPS 24 micron imaging in order to either detect the sources or provide strongly constraining upper limits on 24 micron flux. The 850/24 micron ratio measures the relative contribution of hot and cold dust emission, which places strong constraints on AGN energy contributions. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 226/742 Spitzer Space Telescope − General Observer Proposal #3699 Measuring the Mass, SFR, and Ages of Galaxies Within the z=2.38 Filament Principal Investigator: James Colbert Institution: Spitzer Science Center Technical Contact: James Colbert, Spitzer Science Center Co−Investigators: Harry Teplitz, Spitzer Science Center Povilas Palunas, University of Texas, Austin Gerard Williger, John Hopkins University Bruce Woodgate, Goddard Space Flight Center Paul Francis, Australian National University Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 20.6 Abstract: We propose to obtain Spitzer images of the central 25x15 arcminutes of a z=2.38 filament of Lya−emitters. As the largest structure known above z=2, it represents a strong opportunity to test the predictions of hierarchical CDM models at high density. By combining IRAC and MIPS 24 micron observations, we will obtain ages, dust content, star formation rates, and masses for the Lya−emitters. We will also search the filament for the reddened star−forming galaxies which are predicted to cluster in higher density regions, such as the ultraluminous infrared galaxies (ULIGs). This field is also home to four (of 8 known) members of a recently discovered new class of object, the high−redshift extended Lya "blob’’. These Lya blobs may directly show the formation of galaxies via the infall of intracluster gas or the outflow of enriched gas into the ICM, depending on their origin. Our IRAC and MIPS 24 micron observations can distinguish between the various models for the energy source that powers these objects. Thursday March 25, 2010 xgal_covers.txt 113/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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