Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 339/742 Spitzer Space Telescope − General Observer Proposal #50189 A Close Look at z>5 Galaxy Analogues in the Local Universe Principal Investigator: Elizabeth Stanway Institution: University of Bristol Technical Contact: Elizabeth Stanway, University of Bristol Co−Investigators: Luke Davies, University of Bristol Matthew Lehnert, GEPI, Observatoire de Paris, France Laura Douglas, Gepi, Observatoire de Paris, France Malcolm Bremer, University of Bristol Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap IrsStare Hours Approved: 16.5 Abstract: Lyman break galaxies (LBGs) at high redshifts (z>5) probe the earliest stages of massive galaxy formation, exploring a low−metallicity/low−mass regime seldom seen in today’s universe. In order to overcome the difficulty of studying the most distant objects, we have identified a rare set of local galaxies with rest−frame ultraviolet−optical properties similar to those of z>5 LBGs from the joint GALEX−SDSS databases. We propose to extend our study of these galaxies into the infrared, studying their stellar, dust and gas content, and for the first time obtaining a true estimate of the specific star formation density in this mode of star formation. In particular, these observations should help answer several key unknowns about the highest redshift LBGs. With IRS spectroscopy we will determine whether the molecular gas is too heated to continue star formation for an extended period, explaining the short−lived and stochastic star formations seen at z=5. Photoionization analysis of ratios of high ionization potential forbidden lines available in combination with the strong, narrow optical emission lines will determine the hardness of the ionising spectrum. Finally, a full UV−Far−IR SED employing data from GALEX, SDSS, IRAC and MIPS will allow us to relate these intense starbursts to other known starbursts, in particular the amount of dust emission per unit mass and quantity of obscured star formation in these systems. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 340/742 Spitzer Space Telescope − General Observer Proposal #20190 Bolometric Star Formation Rates as a Function of Large−Scale Environment at Z~2 Principal Investigator: Charles Steidel Institution: California Institute of Technology Technical Contact: Charles Steidel, California Institute of Technology Co−Investigators: Naveen Reddy, California Institute of Technology Alice Shapley, University of California at Berkeley Dawn Erb, California Institute of Technology Max Pettini, Institute of Astronomy, University of Cambridge Kurt Adelberger, Carnegie Institution of Washington Jiasheng Huang, Harvard−Smithsonian Center for Astrophysics Pauline Barmby, Harvard−Smithsonian Center for Astrophysics Science Category: high−z galaxies (z>0.5) Observing Modes: MipsPhot Hours Approved: 22.8 Abstract: We propose Spitzer/MIPS 24 micron observations in the HS1700+643 field to study the bolometric energy production from galaxies within and surrounding the most significant cluster−scale over−density at z>1.5, at a time when massive galaxies were forming most of their stars. This over−density is at z=2.300, placing the strong 7.7 micron feature observed in star−forming galaxies in the MIPS 24 micron filter, and therefore makes MIPS observations ideally suited for studying the star formation rates and energetics of galaxies as a function of environment. Stellar population modeling of broad−band UV to Spitzer/IRAC SEDs indicates significant differences in the ages and masses of galaxies within and outside of the proto−cluster. The proposed MIPS observations will allow us to determine if these differences extend to the bolometric energy output of galaxies in the proto−cluster and surrounding environment in a manner that is completely independent of the degeneracies of SED modeling and uncertainties in extinction. The extensive multi−wavelength data in the field containing the proto−cluster will allow for the unprecedented opportunity to compare MIPS−inferred bolometric SFRs with UV and Halpha estimates on a galaxy−by−galaxy basis to establish star formation relations for galaxies with a wide range in ages, stellar masses, and luminosities at z~2. Spitzer/MIPS observations of the HS1700+643 proto−cluster therefore offer the opportunity to understand star−formation and its environmental dependencies in a unique and well−studied laboratory at high redshift. Thursday March 25, 2010 xgal_covers.txt 170/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 341/742 Spitzer Space Telescope − General Observer Proposal #30416 Galaxies, AGN, and Environment: A High Dynamic Range Study at z=1.5−3 Principal Investigator: Charles Steidel Institution: California Institute of Technology Technical Contact: Charles Steidel, California Institute of Technology Co−Investigators: Naveen Reddy, California Institute of Technology Alice Shapley, Princeton University Dawn Erb, Harvard−Smithsonian Center for Astrophysics Max Pettini, Cambridge University David Law, California Institute of Technology Thiago Goncalves, California Institute of Technology Milan Bogosavljevic, California Institute of Technology Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 33.8 Abstract: We propose Spitzer IRAC (3.6/5.8 micron) and MIPS (24 micron) observations in the fields of two very bright QSOs, HS1549+1933 (z=2.844) and Q2343+1225 (z=2.574), in which we have been conducting intensive spectroscopic surveys of galaxies and AGN in the redshift range 1.5
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Extragalactic abstracts - IRSA - California Institute of Technology

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