Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 415/742 Spitzer Space Telescope − General Observer Proposal #50644 Constraints on Accretion Disk Physics in Low Luminosity Radio Galaxies Principal Investigator: Stefi Baum Institution: Rochester Institute of Technology Technical Contact: Stefi Baum, Rochester Institute of Technology Co−Investigators: Jacob Noel−Storr, Rochester Institute of Technology Christopher O’Dea, Rochester Institute of Technology Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap MipsPhot Hours Approved: 1.7 Abstract: It is currently believed that essentially all galaxies harbor a massive black hole in their nuclei. If this is true, then it becomes hard to understand why we do not see the luminosity released by the inevitable accretion of the galaxy ISM onto the black hole in all galaxies. The differences in AGN output between the two classes of narrow−line radio galaxies (FRI and FRII) may hold the vital clue. High radio luminosity FRIIs generally show strong high−excitation narrow lines and are believed to be the obscured counterparts of radio loud quasars. Low radio luminosity FRIs by contrast have weaker, low−ionization lines and low ratios of optical to radio luminosities. A large difference in accretion rate and radiative efficiency between FRI and FRIIs would explain the difference in the optical properties and also provide a new unification between different classes of active galaxies in which the dominant parameter is accretion rate. Spitzer IRAC and MIPS observations already exist for most of a well defined sample of FRIs. However, the previously observed objects are the "famous" ones, e.g., M87, M84, NGC315, 3C264, 3C31. Thus, the existing datasets are highly selected. Here we propose a very small request to complete the sample. We propose IRAC observations in all 4 bands, and MIPS photometry at 24 and 70 microns of 8, and 7 sources, respectively, for a total request of 1.7 hrs. These observations will complete the sample at very little cost in observing time. The large amount of existing complmentary data at multiple wavebands will greatly enhance the legacy value of the proposed observations. By completing the sample, the proposed IRAC and MIPS observations will produce a well defined and very well studied sample of nearby low luminosity radio galaxies. We will use the completed sample to investigate the properties of the accretion disk radiation, and the circumnuclear obscuring material. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 416/742 Spitzer Space Telescope − General Observer Proposal #20651 The low−redshift 3CRR sources: missing data Principal Investigator: Mark Birkinshaw Institution: University of Bristol Technical Contact: Mark Birkinshaw, University of Bristol Co−Investigators: Peter Barthel, University of Groningen Paul Green, Smithsonian Institution Astrophysical Observatory Dean Hines, University of Arizona Eric Hooper, University of Texas Charles Lawrence, Jet Propulsion Laboratory Howard Smith, Smithsonian Institution Astrophysical Observatory Ilse van Bemmel, Space Telescope Science Institute Belinda Wilkes, Smithsonian Institution Astrophysical Observatory Steve Willner, Smithsonian Institution Astrophysical Observatory Diana Worrall, Smithsonian Institution Astrophysical Observatory Science Category: AGN/quasars/radio galaxies Observing Modes: MipsPhot Hours Approved: 1.2 Abstract: We propose MIPS observations of 3C 338 to conclude the program of IRAC and MIPS imaging photometry of the complete sample of z < 0.1 3CRR radio galaxies that was awarded time in AO1. These MIPS observations were expected from a GTO program, but are no longer in the ROC. The overall aims of the study are (1) to measure the energy outputs of the active nuclei and test the relationship between radio power and nuclear properties expected under unified schemes; (2) to study orientation effects in the IR emission of the nuclei by comparing their IR properties with radio−derived indications of orientation; (3) to confirm the unusual IR colors of the host galaxies, which we interpret in terms of dusty debris from a recent encounter; and (4) to construct wide−band spectra for the radio jets, and so test our prediction of spectral breaks in the mid−IR arising from the existence of a maximum electron energy. The data received so far confirm the feasibility of this program, and we wish to obtain the 3C 338 MIPS images since this is one of the few cD galaxies in the sample at the core of an X−ray bright cluster, and to avoid compromising the legacy value of the overall dataset. Thursday March 25, 2010 xgal_covers.txt 208/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 417/742 Spitzer Space Telescope − General Observer Proposal #3418 The low−redshift 3CRR sources Principal Investigator: Mark Birkinshaw Institution: University of Bristol Technical Contact: Mark Birkinshaw, University of Bristol Co−Investigators: Peter Barthel, University of Groningen Paul Green, Smithsonian Institution Astrophysical Observatory Dean Hines, University of Arizona Eric Hooper, University of Texas Charles Lawrence, Jet Propulsion Laboratory Howard Smith, Smithsonian Institution Astrophysical Observatory Ilse van Bemmel, Space Telescope Science Institute Belinda Wilkes, Smithsonian Institution Astrophysical Observatory Steve Willner, Smithsonian Institution Astrophysical Observatory Diana Worrall, Smithsonian Institution Astrophysical Observatory Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap MipsPhot Hours Approved: 33.5 Abstract: We propose a program of IRAC and MIPS imaging photometry of the complete sample of z < 0.1 3CRR radio galaxies. These images will provide excellent information on the IR colors of the galaxies and active nuclei, and detect IR emission from several of the radio jets. We will use the data (1) to confirm the unusual IR colors of the host galaxies, which we interpret in terms of dusty debris from a recent encounter, which may have provided the fuel for the current radio activity of the nuclei; (2) to measure the energy outputs of the nuclei, and test the relationship between radio power and nuclear properties expected under unified schemes (and barely hinted at in the ISO database); (3) to study orientation effects in the IR emission of the nuclei, by comparing their IR properties with radio−derived indications of orientation; and (4) to construct wide−band spectra for the radio jets, and so test the universality of the maximum electron energy that appears from our radio to X−ray spectra, which we expect to result in a spectral break in the mid−IR at flux density levels accessible only to the Spitzer Space Telescope. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 418/742 Spitzer Space Telescope − General Observer Proposal #3327 Catching the bulk of non−thermal radiation from hot−spots: proving particle acceleration in extragalactic radio sources Principal Investigator: Marco Bondi Institution: Istituto di Radioastronomia Technical Contact: Marco Bondi, Istituto di Radioastronomia Co−Investigators: Gianfranco Brunetti, Istituto di Radioastronomia Giancarlo Setti, Dipartimento di Astronomia, Univ. di Bologna Karl−Heinz Mack, Istituto di Radioastronomia Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap MipsPhot Hours Approved: 3.1 Abstract: We request 3.1 hours of IRAC (3.6 through 8.0 $mu$m) and MIPS (24 $mu$m only) observations of a small sample of extragalactic hot−spots (HSs) with published sensitive radio and optical data. HSs are compact regions in the radio lobes of powerful extragalactic radio sources emitting synchrotron radiation. In these regions electrons are re−accelerated through shocks. In the last years, arcsecond resolution radio, optical and X−ray observations of hot−spots have allowed to understand and model the physics of acceleration in these regions. Infrared observations are particularly relevant since the emitting properties of the HSs in this band are almost unknown and it is in this domain that the selected hot−spots are expected to release the bulk of their synchrotron emission. The proposed observations represent a unique possibility to test the existent models of shock emission and clearly discriminate between different interpretations, in particular whether a single or multiple electron population is responsible for the broad−band synchrotron emission. Thursday March 25, 2010 xgal_covers.txt 209/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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