Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 563/742 Spitzer Space Telescope − General Observer Proposal #30785 Coordinated Spitzer/Chandra Observations of Gamma Ray Blazars Principal Investigator: Ann Wehrle Institution: Space Science Institute Technical Contact: Ann Wehrle, Space Science Institute Co−Investigators: Patrick Ogle, Spitzer Science Center Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap IrsStare MipsPhot Hours Approved: 6.3 Abstract: We propose for coordinated Spitzer and Chandra observations of fourteen gamma−ray blazars. The blazars have two−peaked spectral energy distributions, where the infrared peak is synchtrotron emission produced by relativistic electrons, and the x−ray−gamma−ray peak is inverse−Compton scattered emission. The observations will map out the shape of the infrared synchrotron peak and its changes with two sets of independent observations about six months apart. All three Spitzer instruments will be used in normal, successive instrument campaigns, as we did during our 2005 observations of flaring blazar 3C454.3. The Chandra observations are used to obtain x−ray fluxes and spectral indices which will indicate relative contributions of synchrotron and inverse−Compton emission in the Chandra x−ray band. The Spitzer MIPS and Chandra observations need to be scheduled within a day of each other because the sources are highly variable. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 564/742 Spitzer Space Telescope − General Observer Proposal #50231 Blazar Archetypes as Probes of Jet Physics Principal Investigator: Ann Wehrle Institution: Space Science Institute Technical Contact: Ann Wehrle, Space Science Institute Co−Investigators: Benoit Lott, CENBG, France Patrick Ogle, SSC/IPAC Anita Reimer, Stanford University Dayton Jones, JPL Markus Boettcher, Ohio University Gino Tosti, INFN, Perugia, Italy Stefano Ciprini, INFN, Perugia, Italy Andrea Tramacere, Stanford University and ASI−INAF Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap IrsStare MipsPhot Hours Approved: 15.2 Abstract: We propose to observe three archetypal blazars daily during intense 21−day global multiwavelength campaigns. The blazars 3C279, 3C454.3, and PKS 0528+134 are the brightest and most active observed with the EGRET instrument on the gamma ray telescope CGRO; we expect them to be detected at high SNR with GLAST. The Spitzer observations will be coordinated with daily Swift x−ray, ultraviolet and optical observations, with continuous GLAST sky−scanning observations., and with extensive groundbased observations. The resulting time−resolved spectral energy distributions, light curves and time lags between wavebands provide information on important aspects of the jet and its environment. These include breaking the degeneracy between the Doppler factor, the magnetic field, and the Lorentz factor at the break in the electron distribution. We will also model the composition of the jet (leptons or leptons and hadrons). Ultimately, the composition of the jets affects how much power is transmitted to the radio lobes, and thus how much power is dumped into the galaxy and environment. All three instruments will be used in standard instrument campaigns. The observations can be spaced flexibly every 24−48 hours depending on the length of the actual instrument cycles. GLAST will be launched in mid−2008 and will scan the full sky every three hours. We have identified optimal and backup windows which depend on the actual launch date. The coordinated observations are loosely constrained because Swift scheduling is very flexible: Swift can follow the Spitzer schedule. This is the second highest priority proposal of the GLAST LAT AGN Collaboration and is submitted on the Collaboration’s behalf. Thursday March 25, 2010 xgal_covers.txt 282/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 565/742 Spitzer Space Telescope − General Observer Proposal #50753 Infrared Search for Hidden Active Galactic Nuclei Principal Investigator: Michael Werner Institution: JPL Technical Contact: Varoujan Gorjian, JPL Co−Investigators: Daniel Stern, JPL Kieran Cleary, JPL Stephen Murray, Harvard Smithsonian Center for Astrophysics Christine Jones, Harvard Smithsonian Center for Astrophysics William Forman, Harvard Smithsonian Center for Astrophsyics Ryan Hickox, Harvard Smithsonian Center for Astrophysics Varoujan Gorjian, JPL Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 19.7 Abstract: In 1982 Elvis et al called attention to a pair of galaxies with AGN−like x−ray emission but no AGN features in their visible spectra [referred to here as XBONGS]. Since then, deep x−ray surveys [Moran et al 2002] have revealed large numbers of galaxies with these characteristics: luminous in the x−ray but without the high excitation lines, specific line ratios, or broad emission lines which characterize Type I and/or Type II AGN. Thus understanding XBONGS is an important step towards defining the accretion history of the Universe. For brevity, we continue to refer to these objects as XBONGS, while recognizing that they are not a homogeneous group, and in fact a variety of explanations have been proposed. It has been suggested that XBONGs are powered by AGN which are hidden at visible wavelengths by (i) dilution by the bright emission from the galaxy, by (ii) extinction, or by (iii) the absence of visible and ultraviolet radiation due to modifications in the character of the accretion disk which surrounds the central black hole. These suggestions can be tested by infrared observations, so we propose here a program of IRS spectroscopy of 8 XBONGs carefully selected from 26 XBONGs identified in the XBootes survey of the NOAO Deep Wide−Field Survey. We will observe the [NeV] 14.3um and the [NeIII] 15.6um lines to identify and characterize the hidden AGN in these galaxies, drawing on our published Spitzer observations of these lines in AGN with known x−ray emission. We hope to distinguish among the competing models for the XBONG phenomenon and to make an assessment of this problem as part of the legacy of the cryogenic Spitzer mission. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 566/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #86 Imaging and Spectroscopy of X−ray Selected Seyfert Galaxies Principal Investigator: Michael Werner Institution: JPL Technical Contact: Varoujan Gorjian, JPL Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare MipsPhot Hours Approved: 23.5 Abstract: In present unified schemes, dust plays a major role in determining Seyfert types, with Seyfert 1’s being less obscured and Seyfert 2’s being more obscured, but both with the same underlying energy generation mechanism, an accretion disk around a supermassive black hole. We have chosen to study a group of Seyferts at two wavelengths that are least affected by dust obscuration: x−rays and infrared. Our sample is a mix of Seyfert 1’s and Seyfert 2’s which have been observed in the x−rays, for which we will obtain IR spectra with all IRS modules, and photometry at 25 and 70 microns with MIPS. By comparing the characteristics of these two penetrating data sets we will be able to constrain better the role of dust in the nuclei of these active galaxies, especially the large column densities (>10^25 Hydrogen atoms per cm^2) derived from x−ray observations. Thursday March 25, 2010 xgal_covers.txt 283/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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