Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 207/742 Spitzer Space Telescope − General Observer Proposal #20683 Life Before the Fall: Star Formation of Galaxies in Groups Prior to Cluster Assembly at z~0.37 Principal Investigator: Kim−Vy Tran Institution: ETH Zurich Technical Contact: Kim−Vy Tran, Leiden Observatory Co−Investigators: Anthony Gonzalez, University of Florida John Moustakas, University of Arizona Dennis Zaritsky, University of Arizona Science Category: intermediate−z galaxies 0.05
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 209/742 Spitzer Space Telescope − General Observer Proposal #40430 Spitzer Observations of the Brightest Lensed LBGs Principal Investigator: Sahar Allam Institution: University of Wyoming Technical Contact: Sahar Allam, University of Wyoming Co−Investigators: Andrew Baker, Rutgers University Huan Lin, Fermilab Dieter Lutz, MPE−Garching Alice Shapley, Princeton University J. Allyn Smith, APSU/Wyoming Michael Strauss, Princeton University Douglas Tucker, Fermilab Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap IrsMap MipsPhot Hours Approved: 15.8 Abstract: On rare occasions, the otherwise very faint Lyman break galaxies (LBGs) are magnified by gravitational lensing to provide exceptional targets for detailed spectroscopic and imaging studies. The primary objective of this proposal is to constrain the star formation histories and stellar masses of the two brightest such objects, estimate their bolometric dust luminosities, distinguish between starburst and AGN bolometric energetics, and compare the detailed rest−frame mid−IR spectra of dust emission and absorption with known low−redshift templates. In particular, the magnification of our targets enables a unique probe of the nature of dust and star formation at high redshift using IRS, which is simply not possible for typical unlensed UV−selected galaxies at similar redshifts. We propose Spitzer IRAC and MIP images and IRS low−resolution spectra of the two newly discovered brightest, lensed LBGs with, using only a modest amount of Spitzer time (24.6 hours). Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 210/742 Spitzer Space Telescope − General Observer Proposal #50086 Doubling the Sample of Bright Lensed LBGs Observed by Spitzer Principal Investigator: Sahar Allam Institution: University of Wyoming Technical Contact: Sahar Allam, University of Wyoming Co−Investigators: Douglas Tucker, Fermilab Huan Lin, Fermilab Min−Su Shin, Princeton University Michael Strauss, Princeton University Andrew Baker, Rutgers University Dieter Lutz, MPE J. Allyn Smith, APSU Alice Shapley, Princeton University Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap IrsMap MipsPhot Hours Approved: 114.5 Abstract: Observations of galaxies at z=2−3 probe the epoch when star formation in galaxies peaked and the morphologies of galaxies were being set. UV−selected populations like the Lyman break galaxies (LBGs) have been extensively studied at short wavelengths, but in most cases are too faint to permit observations (particularly spectroscopy) in the mid−infrared. We propose new Spitzer observations of five recently discovered LBG−like objects whose apparent fluxes have been strongly boosted by gravitational lensing. By combining IRAC, MIPS, and (irreplaceable) IRS data with our extensive ancillary datasets, we will constrain our targets’ star formation histories and stellar masses, bolometric dust luminosities, starburst/AGN bolometric energetics, and degree of similarity with various low−redshift templates. The proposed observations would more than double the number of lensed UV−selected galaxies at high redshift that Spitzer will have observed by the end of its cryogenic mission. Thursday March 25, 2010 xgal_covers.txt 105/371
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