Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 567/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #242 IRS spectroscopy of type II quasars Principal Investigator: Nadia Zakamska Institution: Princeton University Technical Contact: Nadia Zakamska, Princeton University Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 8.0 Abstract: The success of unification models for Seyfert galaxies raises the question of whether these models can be extended to high luminosity AGNs. We recently published a sample of 150 type II (obscured) quasar candidates at redshifts z
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 569/742 Spitzer Space Telescope − General Observer Proposal #50420 The AGN−starburst connection: How prominent is star formation in galaxies with very young AGN? Principal Investigator: Nathan de Vries Institution: Leiden University Technical Contact: Nathan de Vries, Leiden University Co−Investigators: Ignas Snellen, Leiden University Bernhard Brandl, Leiden University Huub Rottgering, Leiden University Richard Schilizzi, International SKA project office Jacco Vink, Utrecht University Karl−Heinz Mack, Istituto di Radioastronomia − INAF, Bologna Daniele Dallacasa, Bologna University Carla Fanti, Istituto di Radioastronomia − INAF, Bologna Roberto Fanti, Istituto di Radioastronomia − INAF, Bologna Carlo Stanghellini, Istituto di Radioastronomia − INAF, Bologna Peter Barthel, Groningen University Science Category: AGN/quasars/radio galaxies Observing Modes: MipsPhot Hours Approved: 5.5 Abstract: Recently, Spitzer has been investigating the infrared properties of classical, powerful radio galaxies, and those of intermediate size radio sources. In this proposal we wish to extend these studies, and determine the infrared properties of the host galaxies of GPS sources, an enigmatic class of compact radio source that represents the youngest stage of radio source evolution. The AGN activity in GPS galaxies is still so recent (radio sources of typically 100−1000 years − as shown by VLBI monitoring), that there has been very little time for the AGN to influence the host galaxies, and they should be in the suggested transition phase between dominating starburst and AGN activity in major merger events. We will establish the dominant heating mechanisms for these unique objects, and determine the evolution of the dust properties as function of AGN life cycle. We propose to observe a sample of 15 young radio galaxies, matching in radio power and redshift with the extended radio galaxies, at 24 and 70 micron using MIPS. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 570/742 Spitzer Space Telescope − General Observer Proposal #20727 High redshift, low luminosity radio galaxies in the NDWFS Bootes and Spitzer FLS fields Principal Investigator: Wil van Breugel Institution: UC Merced Technical Contact: Wil van Breugel, UC Merced Co−Investigators: Steve Croft, LLNL−IGPP Arjun Dey, NOAO Wim de Vries, UCD−LLNL Peter Eisenhardt, JPL Adam Stanford, UCD−IGPP Daniel Stern, JPL Steve Willner, Harvard−CFA Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap Hours Approved: 22.6 Abstract: The identification fraction of IRAC sources in the ‘Shallow’ surveys of the Bootes NDWFS and the First Look Survey field of moderately bright, 1 − 10 mJy level, radio sources drops significantly for 92 cm − 21 cm steep spectrum sources. Keck K−band observations of a handful of such sources show that 2/3 have K ~ 21 − 22, ‘classic’, fuzzy high redshift radio galaxy (HzRG) morphologies. We propose to obain deep IRAC identifications of a sample of such steep spectrum selected HzRG candidates which are marginally or un−detected at 3.6 micron. We expect that perhaps as many as half of these will be HzRGs at z > 3, with luminosities 10 − 100 lower and co−moving volume densities more than 1000 larger than the extremely luminous HzRGs known to date. This will make it possible, for the first time, to get a complete census of the radio source population (galaxies, starbursts, and quasars) in well studied fields that also includes high redshift radio galaxies. This will not only help us better understand the formation and evoution of these galaxies and their AGN, but also may allow us to search for proto−cluster overdensities, and study their galaxy populations, selected at less extreme radio luminosities than has been possible before. Thursday March 25, 2010 xgal_covers.txt 285/371
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