Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 463/742 Spitzer Space Telescope − General Observer Proposal #3231 Establishing the mid−infrared selection of AGN Principal Investigator: Martin Haas Institution: Astronomisches Institut, Ruhr−Universitaet Bochum Technical Contact: Martin Haas, Astronomisches Institut, Bochum Co−Investigators: Ralf Siebenmorgen, ESO,Garching, Germany Stephan Ott, ESTEC, ESA, The Netherlands Belinda Wilkes, Harvard−Smithsonian CfA, Cambridge, USA John P. Huchra, Harvard−Smithsonian CfA, Cambridge, USA Rolf Chini, Ruhr−Universitaet Bochum, Germany Sven A.H. Mueller, Ruhr−Universitaet Bochum, Germany Christian Leipski, Ruhr−Universitaet Bochum, Germany Norbert Schartel, XMM−Newton SOC, VILSPA, ESA, Spain Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 10.1 Abstract: Since a large fraction of AGN is missed in common UV−excess surveys, and even in radio, near−IR and X−ray surveys, we have searched for AGN via mid−IR emission from their nuclear dust at T>300 K. This is a new AGN selection technique, and one not affected by extinction. Among 3000 high galactic latitude sources randomly detected by ISO at 6.7 microns we have discovered a population of extremly infra−red, mostly unknown objects. This population is not detected on IRAS−ADDSCANs and very few of these sources show up in the NVSS and FIRST radio surveys. Various colour criteria from 2MASS and optical wavebands and the comparison with known object types show that the sources have a higher MIR excess than those seen in the ELAIS survey. Our analysis suggests that we have, in fact, found AGN with a pronounced MIR emission. We estimate that, if this is true, the number counts of AGN will have to be revised dramatically upwards. In order to verify our hypothesis on the AGN nature of the sources, we have selected MIR−excess AGN candidates with unknown classification from our ISO survey. First results from optical spectrocopy show some to be AGN, but also that many of the sources are extremely reddened. Therefore, we here apply for 5−40 micron IRS spectroscopy of 30 of the remaining unidentified sources to establish their nature as AGN, to determine the fraction of type 1 and 2 AGN among this MIR selected sample, and to constrain their additional starburst contribution. While new IR surveys from Spitzer are expected to find more such interesting objects, we have already identified a promising sample. The requested observations will make a significant contribution to the debate on the entire AGN population. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 464/742 Spitzer Space Telescope − General Observer Proposal #40314 IRS 19−38 micron spectra of 3CRR radio galaxies and quasars at z>1: Testing AGN unification at the peak of cosmic activity Principal Investigator: Martin Haas Institution: Astronomisches Institut, Bochum, Germany Technical Contact: Martin Haas, Astronomisches Institut, Bochum Co−Investigators: Giovanni Fazio, Harvard−Smithsonian CfA Belinda Wilkes, Harvard−Smithsonian CfA Steven Willner, Harvard−Smithsonian CfA Robert Antonucci, Univ. California Santa Barbara Christian Leipski, Univ. California Santa Barbara Pat Ogle, Caltech Rolf Chini, Astron. Inst. Bochum, Germany Ralf Siebenmorgen, ESO, Garching Peter Barthel, Kapteyn Inst. Groningen, NL Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 19.3 Abstract: Pure orientation−dependent AGN unification predicts for unobscured isotropic observables that powerful FRII radio galaxies and steep−spectrum quasars show the same distribution of high−excitation lines to radio power and of high− to low− excitation lines. By means of IRS spectra we were able to provide a successful test of this prediction for radio sources at intermediate redshift up to z1 submillimetre observations of quasars and radio galaxies found intriguing differences between the two AGN classes. The differences could be due to the higher intrinsic luminosity at z>1, to co−eval starbursts or to other evolutionary effects which are related to the higher activity at the earlier cosmic epoch. In order to test AGN unification at high redshift and luminosity, we propose to obtain IRS low−resolution spectra of a complete 3CRR sample at 1
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 465/742 Spitzer Space Telescope − General Observer Proposal #20741 The mid−IR spectroscopy of the SDSS AGN Principal Investigator: Lei Hao Institution: Cornell University Technical Contact: Lei Hao, Cornell University Co−Investigators: Michael Strauss, Princeton University Vassilis Charmandaris, University of Crete Lee Armus, Spitzer Science Center Henrik Spoon, Cornell University Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 31.7 Abstract: We propose to observe the IRS low−resolution spectroscopy for a well defined sample of 74 AGN. The targets are drawn from the AGN catalogue spectroscopically selected from the Sloan Digital Sky Survey. We carefully sample both broad−line and narrow−line AGN over the entire [OIII]$\\lambda5007$ luminosity range, so that we can investigate the AGN dust properties as measured by the IRS low−res spectra as a function of luminosity. In the mean time, by comparing the dust properties of narrow−line and broad−line AGN of similar nuclear luminosities, we will be in a much better position to justify and improve our understandings of the unification scheme. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 466/742 Spitzer Space Telescope − General Observer Proposal #40330 Are Starbursts the Progenitors of Supermassive Black Holes? Principal Investigator: Tim Heckman Institution: Johns Hopkins University Technical Contact: Tim Heckman, Johns Hopkins University Co−Investigators: Vivienne Wild, Max−Planck Institut fuer Astrophysik Paule Sonnentrucker, Johns Hopkins University Brent Groves, Leiden Observatory Lee Armus, Spitzer Science Center Guinevere Kauffmann, Max−Planck Institut fuer Astrophysik Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 8.0 Abstract: A popular model for the coevolution of bulges and supermassive black holes is one in which a galaxy merger leads to the inflow of gas which fuels a strong burst of star formation, followed by an AGN phase in which the black hole grows significantly. In this proposal we describe how mid−IR spectroscopy with Spitzer can directly test this model. Using the Sloan Digital Sky Survey to undertake a census of the growth of black holes in the local universe, we have found that a significant fraction of this growth seems to take place in a rare class of highly dust−obscured AGN hosted by morphologically disturbed galaxies whose optical spectra imply that they are in the post−starburst phase. Because of the high extinction in the optical, IRS data are required to: 1) Verify the presence of powerful AGN through measurements of the luminosity of the mid−IR [NeV] emission−lines, and 2) Verify that these are truly post−starbursts rather than dusty starbursts whose massive stars are invisible in the optical spectra. In this case, the discrimination will be primarily made using the equivalent widths of the PAH features. The combination of the robust statistics from the SDSS sample and the diagnostic power of the IRS will make this the best test to date of the significance of a starburst−to−AGN evolutionary pathway. Thursday March 25, 2010 xgal_covers.txt 233/371
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