Extragalactic abstracts - IRSA - California Institute of Technology

Spitzer_Approved_Extragalactic
Mar 25, 10 16:24 Page 247/742
Spitzer Space Telescope − Directors Discretionary Time Proposal #473
The Physics of High Redshift Galaxies: Star Formation, Chemistry and Gas Flows
Principal Investigator: Dawn Erb
Institution: Harvard−SAO
Technical Contact: Dawn Erb, Harvard−SAO
Science Category: high−z galaxies (z>0.5)
Observing Modes: IracMap
Hours Approved: 11.0
Abstract:
I will use rest−frame UV and optical spectra, models of chemical evolution and
star formation, and stellar mass and age determinations from ground−based and
Spitzer photometry to constrain the properties of galaxies at z~2−3, the peak
era of star formation and black hole accretion in the universe. I will focus on
understanding the youngest and lowest mass galaxies, and on refining
measurements of chemical abundances and using them to constrain the magnitudes
of galactic inflows and outflows.
Spitzer_Approved_Extragalactic
Printed_by_SSC
Mar 25, 10 16:24 Page 248/742
Spitzer Space Telescope − Archive Research Proposal #50640
Study of Galaxy Counts and Stellar Excesses in IRS Peak−Up Archival Observations
Principal Investigator: Sergio Fajardo−Acosta
Institution: Spitzer Science Center
Technical Contact: Sergio Fajardo−Acosta, Spitzer Science Center
Co−Investigators:
Harry Teplitz, Spitzer Science Center
James Colbert, Spitzer Science Center
Lee Armus, Spitzer Science Center
Vassilis Charmandaris, University of Crete
Science Category: high−z galaxies (z>0.5)
Dollars Approved: 75000.0
Abstract:
The IRS Peak−Up arrays are read out in parallel to every Short−Low spectrum
taken during the Spitzer mission. We propose to mine this extensive set of more
than 170,000 Peak−Up images, which are amply distributed across the sky. We
propose to use these images for two main programs: (i) to study galaxy counts in
moderately deep 16 micron images over a wide area; and (ii) to search for
infrared excesses from stars. The 16 micron Peak−Up images include almost a
square degree of low−background data at exposure times of at least 100 sec. Of
these, about 300 square arcmin have exposure times greater than 15 minutes.
These data will include 5,000−−10,000 galaxies with 16−micron flux densities >
120 micro−Jy. This deep survey is unique because such coverage cannot be
achieved in dedicated pointed observations, due to the small Peak−Up field of
view. The IRS Peak−Up blue and red filters sample the SEDs of stellar sources at
16 and 22 microns. The stellar systems we will study are main−sequence and
evolved stars. We expect to detect at least several hundred stars in the Peak−Up
images, and expect to find excesses in about 10% of main−sequence stars, plus a
higher percentage of dust shells around evolved stars. The intended goal of this
study is the detection of new and unique phenomenology in main−sequence and
evolved stars. We propose to release catalogs of point sources, as added−value
products for the community. Through this program we will expand the impact of
Spitzer observations for ancillary discoveries.
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