Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 507/742 Spitzer Space Telescope − General Observer Proposal #50309 Investigating the Physics of ISM in Type 2 QSOs Principal Investigator: Andreea Petric Institution: Spitzer Science Center Technical Contact: Andreea Petric, Spitzer Science Center Co−Investigators: Mark Lacy, Spitzer Science Center Nick Seymour, Spitzer Science Center Anna Sajina, Haveford College Lisa Storrie−Lombardi, Spitzer Science Center Lee Armus, Spitzer Science Center Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 45.5 Abstract: One of Spitzer’s major contributions to the study of galaxy formation and evolution has been the detection of large numbers of obscured AGN. Spitzer found a large number of bigger and bolometrically brighter versions of Seyfert 2’s, known as type 2 QSOs, whose existence had, until recently, only been theorized. Here, we propose to use IRS high resolution capabilities to perform a detailed analysis of the emission lines in a sample of six 0.3
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 509/742 Spitzer Space Telescope − General Observer Proposal #50388 Obscuration in luminous AGNs Principal Investigator: Mari Polletta Institution: Institut d’Astrophysique de Paris Technical Contact: Mari Polletta, Institut d’Astrophysique de Paris Co−Investigators: Sebastian Hoenig, Max Planck Institute for Radioastronomy Frazer Owen, NRAO Dan Weedman, Cornell Science Category: AGN/quasars/radio galaxies Observing Modes: IrsMap Hours Approved: 37.5 Abstract: Spitzer has unveiled a population of obscured QSOs whose fraction among all mid−infrared selected AGNs is higher than the fraction of obscured AGNs found at optical and X−ray wavelengths. Multi−wavelength observations of these mid−infrared selected obscured QSOs indicate that a sizable fraction of them are not obscured by the putative torus, but by cold dust outside the torus, and that the torus opening angle increases at higher luminosities, supporting the receding torus scenario. We propose to study the MIR spectra of a complete sample of obscured QSOs at 1.3
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