Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 519/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30337 MIPS Imaging of the Hot Spots in Pictor A Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Dean Hines, Space Science Institute Co−Investigators: Dean Hines, Space Science Institute Science Category: AGN/quasars/radio galaxies Observing Modes: MipsPhot Hours Approved: 0.3 Abstract: We propose to obtain 24 and 70 micron images of the western hot spot in the classical double−lobed radio galaxy, Pictor A. We will also obtain a 70 micron image of the eastern hot spot to accompany our existing 24 micron image. When supersonic jets launched by an active galactic nucleus encounter the intergalactic medium, they form bow shocks. Relativistic electrons within this region are re−accelerated by compressed magnetic fields, which produces strong synchrotron emission. These hot spots represent important laboratories for high−energy physics, and considerable effort has been made to understand their structures and energy distributions. Changes in slope of the hot spot spectral energy distribution (SED) are directly related to the particle energy distribution and the magnetic field strength, and typically a hot spot SED appears to have a single break in slope. Based on extrapolations from the radio and optical wavelengths, the break appears to occur in the mid−infrared, but to date there are no mid−to−far infrared measurements of hot spots in radio lobes. We seek to remedy this situation by observing one of the rare radio galaxies where the angular extent of the lobes allows the hot spots to be imaged at both 24 and 70 microns. The MIPS observations will enable the tightest constraints yet available to be placed upon the electron energy distributions within the hot spots of Pictor A. Our results will also help inform studies of other hot spots that cannot be measured at 70 microns. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 520/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30419 IRS Observations of IR−Selected Obscured QSOs in Deep X−ray Fields Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Jennifer Donley, University of Arizona Co−Investigators: Jennifer Donley, University of Arizona Dave Alexander, University of Cambridge Jane Rigby, University of Arizona Dean Hines, Space Science Institute Yong Shi, University of Arizona Pablo Perez−Gonzalez, University of Arizona Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 26.2 Abstract: Because of their optically−faint nature, obscured AGN have historically been difficult to detect. The dust that obscures the optical, UV, and soft X−ray emission, however, re−radiates in the mid−infrared, making Spitzer the ideal tool for studying these elusive objects. We propose low−resolution Spitzer IRS spectroscopy of 10 optically faint, mid−infrared bright sources identified in the Extended−Chandra Deep Field−South (E−CDF−S) and Extended Groth Strip (EGS). The IRS spectra of the majority of such sources observed thus far (~75%) are dominated by silicate absorption features or are featureless, and as such, are best−fit by obscured AGN templates. Infrared spectra by themselves, however, do not provide an unambiguous distinction between obscured AGN and obscured starburst activity. The most direct way to distinguish between these two scenarios is with deep X−ray observations, observations not available in the fields in which these sources have previously been selected. Deep (>200 ks) Chandra X−ray observations are available in both the E−CDF−S and EGS. In combination with the X−ray data, we will use the IRS spectral properties (redshifts, silicate/PAH strengths) to characterize the quasar/AGN content of these sources. In addition, this study will allow us to compare properties of infrared and X−ray selected obscured AGN, and place stringent constraints on the space density of obscured quasar activity. Thursday March 25, 2010 xgal_covers.txt 260/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 521/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30443 How do Buried "Compton−thick" AGN Reprocess Their Energy? Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Jane Rigby, University of Arizona Co−Investigators: Jane Rigby, University of Arizona Jenn Donley, University of Arizona Dean Hines, Space Science Institute Yong Shi, University of Arizona Michael Werner, JPL Varoujan Gorjian, JPL Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap IrsStare MipsPhot MipsSed Hours Approved: 7.9 Abstract: Forty percent of local AGN are obscured by such thick columns of gas and dust that essentially no UV, optical, or
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Extragalactic abstracts - IRSA - California Institute of Technology

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