Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 475/742 Spitzer Space Telescope − General Observer Proposal #2306 Buried AGNs in ultraluminous infrared galaxies − A search for a strong dust temperature gradient − Principal Investigator: Masatoshi Imanishi Institution: National Astronomical Observatory of Japan Technical Contact: Masatoshi Imanishi, NAOJ Co−Investigators: Philip R. Maloney, University of Colorado Charles C. Dudley, Naval Research Labolatory Roberto Maiolino, INAF−Osservatorio di Arcetri Guido Risaliti, INAF−Osservatorio di Arcetri Takao Nakagawa, ISAS, JAXA Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 15.5 Abstract: Ultraluminous infrared galaxies (ULIRGs) have been used extensively to trace the history of star formation in the early universe. However, the major issue of whether ULIRGs are powered primarily by starbursts or buried AGNs is poorly understood. We propose Spitzer IRS low−resolution spectroscopy of a complete sample of nearby non−Seyfert ULIRGs. By combining these data with ancillary ground−based 2.8−4.1 micron spectra, we will search for the signature of a strong dust temperature gradient, an excellent method to distinguish a buried AGN from a starburst, and quantitatively estimate the energetic importance of buried AGNs in ULIRGs. The wide wavelength coverage of Spitzer IRS is crucial for the success of this experiment. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 476/742 Spitzer Space Telescope − General Observer Proposal #3377 To what extent does star formation precede the onset of AGN activity? Principal Investigator: Katherine Inskip Institution: Cavendish Astrophysics Group Technical Contact: Katherine Inskip, University of Sheffield Co−Investigators: Paul Alexander, Cavendish Astrophysics Garret Cotter, Oxford Astrophysics, University of Oxford Malcolm Longair, Cavendish Astrophysics Bojan Nikolic, Cavendish Astrophysics Timothy Pearson, Caltech Astronomy Anthony Readhead, Caltech Astronomy Richard Savage, Sussex Astronomy Centre, University of Sussex Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 5.9 Abstract: There is increasing evidence that the onset of radio−loud AGN activity now appears to be closely related to starbursts, possibly triggered by mergers. A commonly proposed evolutionary scenario has emerged in which an interaction/merger leads to infall of gas to the nuclear region, triggering a starburst. This is followed by a large increase in the amount of material being fed to the central black hole, thereby triggering the production of strong radio emission (e.g. Heckman et al. 1986). Here we propose observations of a small sample of radio loud AGN which are known to be young, i.e. their active phase has been triggered well within the last million years. Our aim is to search, using mid−IR spectroscopy, for signatures of ongoing star formation. Since we can date, with some confidence, the onset of significant AGN activity in these systems (i.e. the radio jet) such a detection would offer strong support to an evolutionary scenario in which significant star formation precedes the onset of AGN activity. Thursday March 25, 2010 xgal_covers.txt 238/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 477/742 Spitzer Space Telescope − General Observer Proposal #30344 Decoupling luminosity, evolution and orientation effects in AGN Principal Investigator: Matt Jarvis Institution: University of Oxford Technical Contact: Mark Lacy, Spitzer Science Center Co−Investigators: Mark Lacy, IPAC Mat Page, MSSL, UCL Gordon Richards, Johns Hopkins Bernhard Schulz, IPAC Jason Stevens, Univ. of Hertfordshire Stephen Serjeant, Open University Alain Omont, IAP Dave Clements, Imperial College London James Dunlop, IfA, Edinburgh Ross McLure, IfA, Edinburgh Alejo Martinez−Sansigre, Oxford Dimitra Rigopoulou, Oxford Chris Simpson, Durham Duncan Farrah, Cornell Paul O’Brien, Leicester Chris Willott, Herzberg Institute Maarten Baes, Ghent Gianfranco de Zotti, Padova Alastair Edge, Durham Eva Schinnerer, MPIA Evanthia Hatziminaoglou, IAC, Tenerife Paola Andreani, INAF Ismael Perez Fournon, IAC, Tenerife Rob Ivison, UKATC, Edinburgh Luigi Spinoglio, IFSI Roberto Maiolino, Arcetri Ian Robson, UKATC, Edinburgh Steve Rawlings, Oxford Manfred Stickel, MPIA Charmandaris Vassilis, UOC Paul ven der Werf, Leiden Ian Waddington, Sussex Aprajita Verma, MPE Tim Waskett, Cardiff Richard McMahon, IoA, Cambridge Robert Priddey, Univ. of Hertfordshire Colin Borys, Caltech Eduardo Gonzalez−Solares, CASU, Cambridge Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap MipsPhot Hours Approved: 42.7 Abstract: With this proposal we will decouple luminosity effects from evolutionary effects in matched samples of radio−loud and radio−quiet quasars, and determine the amount of radiation that is absorbed and reprocessed by the torus, and how this depends on luminosity and orientation. We have constructed a well−defined sample of radio−quiet quasars from the SDSS, spanning two decades in optical luminosity at a single cosmic epoch, to constrain luminosity dependent effects on the hot dust emission from the obscuring torus, without caveats of luminosity − redshift degeneracies, a fundamental problem in flux−density limited sample. Crucially, we have also defined a sample of radio−loud quasars selected in exactly the same way as the radio−quiet quasars, allowing us to address what effect radio emission may have on the dust properties of quasars. Finally, by selecting a sample of radio galaxies matched to have the same distribution in radio luminosity as the radio−loud quasars we will determine how orientation influences the near− and mid−IR SEDs, and in particular obtain a firm hold on Printed_by_SSC Mar 25, 10 16:24 Spitzer_Approved_Extragalactic Page 478/742 the geometry of the obscuring torus. Thus, this data will allow us to directly address all facets of AGN unification. Our sample will also be proposed for Herschel as an Open Time Key Project. Crucially, combining the data from Spitzer with far−infrared data from Herschel and SCUBA2 will allow us, for the first time, to measure the complete dust−sensitive SED for a statistically complete sample of AGN at a single cosmic epoch. Obtaining Spitzer observations of this sample is vital if we are to continue using large area surveys in a variety of wavebands to study AGN over the history of the Universe. It is both timely, and only recently possible to undertake this investigation. Thus, this proposal is the crucial first step in obtaining a benchmark sample with which to use in analysing future survey data across the wavebands to constrain the evolution in accretion and star−formation activity over the history of the Universe. Thursday March 25, 2010 xgal_covers.txt 239/371
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