Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 267/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #262 An Ultra−Deep Spitzer Spectral Survey Principal Investigator: George Helou Institution: Caltech Technical Contact: George Helou, Caltech Co−Investigators: M. Harwitt, J.−L. Puget, Institut d’Astrophysique Spatiale, France H. Roussel, MPIA P. Appleton, SSC K. Sheth, SSC J.D. Smith, U. Arizona D. Dale, U. Wyoming Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap Hours Approved: 46.3 Abstract: We propose to undertake an ultra−deep unbiased extragalactic spectral survey with the IRS in low−resolution mode, to probe the high−end tail of the line−to−continuum ratio in galaxies, and to look for galaxies with unusually high infrared line emission that might escape detection or escape notice in continuum surveys. Such a search is in large part motivated by the potential for novel types of objects, either detected primarily in the lines, or having abnormally high line−to−continuum ratios, either way enabling new insights and new approaches in the study of galaxies. In addition to the potential scientific yield of this experiment, the immediate tangible benefit will be to ascertain how well the noise in IRS data converges for very long integration times, enabling comparably deep integrations in other contexts, e.g., targeted searches for weak line emission. Additional benefits will result from new techniques for flat fielding and background subtraction within the data set. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 268/742 Spitzer Space Telescope − General Observer Proposal #50726 Looking for the End of Star Formation and the Transformation of Future Cluster Galaxies Principal Investigator: Bradford Holden Institution: University of California Observatories/Lick Obs Technical Contact: Bradford Holden, UCO/Lick Obs Co−Investigators: Shannon Patel, UCO/Lick Observatory Arjen van der Wel, Johns Hopkins University Daniel Kelson, OCIW Garth Illingworth, UCO/Lick Observatory Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 19.7 Abstract: Star forming galaxies comprise 90% complete for massive galaxies in one of the clusters − a total 2245 redshifts in the cluster and its outskirts − and the survey of the second cluster is ongoing. From the current catalogs, we have selected 10 groups of galaxies in the outskirts that will become part of the cluster by the present epoch. Our proposed MIPS and IRAC observations, when combined with the data we have in hand, will help determine the star−formation and stellar mass content of galaxies in these groups. We expect to see a distinct reduction in the fraction of massive star−forming galaxies and/or in the average star−formation rate for galaxies in these groups. If this is correct, the processes that transform galaxies into the passively evolving, red−sequence cluster members occurs in the infalling groups, and not necessarily in the cluster core. Thursday March 25, 2010 xgal_covers.txt 134/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 269/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #117 IRS Exploration program Principal Investigator: James R. Houck Institution: Cornell University Technical Contact: James R. Houck, Cornell University Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap IrsStare Hours Approved: 10.8 Abstract: This short program includes a variety of objects which will be observed in a combination of lo−res and hi−res IRS modes. This project has multiple scientific goals. The proposed experiments are considered fairly challenging for the IRS capabilities, but have potential for new unexpected discoveries. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 270/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #11 Dust at High Redshift Principal Investigator: James R. Houck Institution: Cornell University Technical Contact: Tom Soifer, Spitzer Science Center Science Category: high−z galaxies (z>0.5) Observing Modes: IrsStare Hours Approved: 3.5 Abstract: The goal is to probe the properties of dust at high redshifts by obtaining the spectra of sources where the infrared emission is believed to be thermal dust emission. The presence/absence of PAH/Silicate emission/absorption in these systems will address the evolution of the dust content in systems at significant lookback times. The targets chosen are all z>0.9 in which a strong dust continuum has been detected. Thursday March 25, 2010 xgal_covers.txt 135/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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