Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 335/742 Spitzer Space Telescope − General Observer Proposal #50419 The First Investigation of the 3.3 Micron PAH Feature at High Redshift: Preparation for the Warm Mission, WISE, and JWST Principal Investigator: Brian Siana Institution: Spitzer Science Center Technical Contact: Brian Siana, Spitzer Science Center Co−Investigators: Harry Teplitz, Spitzer Science Center Ranga Chary, Spitzer Science Center Lee Armus, Spitzer Science Center Mark Dickinson, NOAO Minh Huynh, Spitzer Science Center James Colbert, Spitzer Science Center David Frayer, NASA Herschel Science Center Carrie Bridge, Spitzer Science Center Andreea Petric, Spitzer Science Center Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap Hours Approved: 22.0 Abstract: The Polycyclic Aromatic Hydrocarbon (PAH) emission features in the mid−IR allow us to study the properties of dust in star−forming galaxies. The 3.3 micron feature is unique amongst these, as it probes the smaller dust grains and is very sensitive to the ionization level of the PAHs. Its importance is increased at high redshift (z > 2), as other PAH features begin to redshift out of the wavelength range of Spitzer IRS or JWST and it is the only dust emission feature accessible at z > 3 with Spitzer. At high redshift, where star−formation rates are higher and stellar masses are lower, the 3.3 micron feature may have markedly higher equivalent widths than observed in local starbursts. In fact, there is evidence that the 3.3 micron feature significantly affects the IRAC (as well as Akari, WISE and JWST) fluxes in star−forming galaxies at z < 2, which may influence stellar mass and photometric redshift estimations. Despite its importance for future high−redshift studies of dust in starburst galaxies, there have been no reported detections of the 3.3 micron feature with Spitzer. We propose IRS Short−Low spectroscopy of nine star−forming galaxies at z ~ 0.75 in the GOODS fields, to detect the 3.3 micron feature and determine how it correlates with the 6.2 & 7.7 features, warm dust measured at 16/24/70 microns, and the total infrared luminosity as inferred from the radio−IR correlation. With these data, we can predict the effects of the 3.3 micron feature on existing (Spitzer, Akari) and future (WISE, Spitzer Warm Mission) photometric surveys, and determine how to best use JWST spectra to quantify dust properties at the highest redshifts. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 336/742 Spitzer Space Telescope − General Observer Proposal #3143 A Panoramic 24−um/HST Survey for Obscured Activity in Clusters at z~0.5 Principal Investigator: Ian Smail Institution: Insitute for Computational Cosmology Technical Contact: Ian Smail, Insitute for Computational Cosmology Co−Investigators: Richard Ellis, Astronomy Department, Caltech Alastair Edge, ICC, Durham Tommaso Treu, UCLA Graham Smith, Astronomy Department, Caltech Jean−Paul Kneib, Caltech/Toulouse Science Category: high−z galaxies (z>0.5) Observing Modes: MipsPhot Hours Approved: 16.3 Abstract: We propose to use MIPS to obtain high quality panoramic 24um mid−IR imaging of galaxies within two rich clusters at z~0.5 which are the subject of an extremely wide−field imaging with HST and massive spectroscopic coverage with ground−based telescopes. We aim to test recent claims for a previously unidentified obscured−starburst population in distant clusters. These galaxies show radio synchotron and mid−IR emission indicative of current strong star formation, but have classical ‘‘Post−starburst’’ optical spectra. The proposed mid−IR imaging will trace the photometric signatures of dust−obscured activity in morphologically− and spectrally−classified samples of galaxies from the high−density cores of the clusters out to their turn−around radii, ~5 Mpc, where they merge into the surrounding field. This will allow us to construct the evolutionary cycle for galaxies as they are accreted onto a cluster, by tracing the variation in their activity as a function of their environment parameterised in terms of their local galaxy, gas and dark matter density. Using these data we will distinguish between the environmental variations characteristic of the different proposed triggering mechanisms. The results of our analysis will provide a clearer view of the physical processes responsible for driving this behaviour as well as the prevelence of dust and obscured starbursts in distant cluster and field galaxies. Thursday March 25, 2010 xgal_covers.txt 168/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 337/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #26 First Look Survey −− Extragalactic Component Principal Investigator: Tom Soifer Institution: Spitzer Science Center Technical Contact: Lisa Storrie−Lombardi, Caltech Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsScan Hours Approved: 62.5 Abstract: The SIRTF First Look Survey extragalactic component is designed to: 1. detect enough extragalactic sources at unexplored sensitivity levels to generate a representative sample and reduce the uncertainties in the source counts, 2. characterize the dominant source populations with both MIPS and IRAC data from SIRTF plus ancillary surveys at optical, near−infrared, and radio wavelengths, and, 3. explore the cirrus foreground at moderately high abs(b), and its effect on point−source detectability. This component is comprised of MIPS and IRAC surveys of four square degrees in the SIRTF northern continuous viewing zone (CVZ) and 1 square degree in the Elais N1 field. A verification survey covering a small region of the CVZ and Elais fields is also included. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 338/742 Spitzer Space Telescope − General Observer Proposal #20593 A MIPS Study of Star Formation in a Protocluster at z=2.1 Principal Investigator: Spencer Stanford Institution: University of California, Davis Technical Contact: Spencer Stanford, University of California, Davis Co−Investigators: George Miley, Leiden University Wil van Breugel, UC−Merced Ranga−ram Chary, SSC/Caltech Huub Rottgering, Leiden University Peter Eisenhardt, JPL Bram Venemans, Leiden University Jaron Kurk, Arcreti Rogier Overzier, Leiden University Andrew Zirm, Leiden University Science Category: high−z galaxies (z>0.5) Observing Modes: MipsPhot Hours Approved: 8.7 Abstract: Spitzer is uniquely able to provide the data we need to make an unbiased estimate of the total amount of current star formation in galaxies in protoclusters. Such information is crucial to understanding the relative formation timescales of the stellar populations, their galaxies, and even the intracluster medium of the host protoclusters. We propose to obtain deep MIPS 24 micron observations of the protocluster MRC~1138−262 at z=2.1. The rest frame wavelengths sampled by the MIPS bandpass will contain the strong PAH feature at 7.7 microns, so the data will be sensitive to current star formation. The proposed depth would detect an L^* luminous IR galaxy with L(IR) = 10^{11} L_sun at the 5 sigma level. Thursday March 25, 2010 xgal_covers.txt 169/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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