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Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_<strong>Extragalactic</strong><br />

Mar 25, 10 16:24 Page 443/742<br />

Spitzer Space Telescope − Guaranteed Time Observer Proposal #30447<br />

IRS spectroscopy <strong>of</strong> "type−3" quasars<br />

Principal Investigator: Giovanni Fazio<br />

Institution: Harvard−Smithsonian Astrophysical Observatory<br />

Technical Contact: Mark Lacy, Spitzer Science Center<br />

Co−Investigators:<br />

Mark Lacy, Spitzer Science Center<br />

Pauline Barmby, CfA<br />

Science Category: AGN/quasars/radio galaxies<br />

Observing Modes: IrsStare<br />

Hours Approved: 4.5<br />

Abstract:<br />

We wish to obtain IRS spectra <strong>of</strong> a sample <strong>of</strong> objects which have the mid−infrared<br />

colors <strong>of</strong> AGN and mid−infared luminosities <strong>of</strong> quasars, but which lack AGN<br />

indicators in their optical spectra. Three <strong>of</strong> these objects have low−ionization<br />

optical spectra, and two lack emission lines but are most likely at z~1−2. We<br />

wish to investigate the possibility that these ‘‘type−3’’ quasars are an early<br />

phase in the development <strong>of</strong> AGN, perhaps hidden by a starburst triggered by the<br />

same merger event which triggered their AGN activity. Other possibilities<br />

include unusual starbursts with large amounts <strong>of</strong> warm dust, or otherwise normal<br />

AGN which lack a narrow line region. IRS spectra will allow us to distinguish<br />

between these different scenarios.<br />

Spitzer_Approved_<strong>Extragalactic</strong><br />

Printed_by_SSC<br />

Mar 25, 10 16:24 Page 444/742<br />

Spitzer Space Telescope − Guaranteed Time Observer Proposal #40072<br />

Spectral Energy Distributions <strong>of</strong> the High−Redshift 3CR Sources: Testing<br />

Unification<br />

Principal Investigator: Giovanni Fazio<br />

Institution: Smithsonian Astrophysical Observatory<br />

Technical Contact: Steven Willner, Smithsonian Astrophysical Observatory<br />

Co−Investigators:<br />

Martin Haas, Astronomisches Institut Universitat, Bochum, Germa<br />

Belinda Wilkes, Harvard−Smithsonian Center for Astrophysics<br />

Jiasheng Huang, Harvard−Smithsonian Center for Astrophysics<br />

Mark Lacy, Spitzer Science Center<br />

Daniel Stern, Jet Propulsion Lab<br />

Gillian Wilson, Spitzer Science Center<br />

Science Category: AGN/quasars/radio galaxies<br />

Observing Modes: IracMap IrsPeakupImage MipsPhot<br />

Hours Approved: 19.9<br />

Abstract:<br />

We propose IRAC, IRS peakup, and MIPS photometry <strong>of</strong> a complete sample <strong>of</strong><br />

high−redshift (z>1) radio galaxies and quasars. The sample contains 63 massive<br />

and powerful radio galaxies and quasars from the 3CR catalog, selected strictly<br />

on the basis <strong>of</strong> flux density <strong>of</strong> the radio lobes. It should therefore be an<br />

orientation−independent sample, suitable for testing AGN unification models.<br />

The observations will consist <strong>of</strong> photometry <strong>of</strong> the radio source counterpart<br />

galaxies from 3.6 to 24 microns. In addition, we will map an approximately 4<br />

arcmin region around the radio galaxy with IRAC to look for possible clusters<br />

around the radio sources. The galaxy spectral energy distributions will enable<br />

us to determine the stellar luminosity and mass <strong>of</strong> the host galaxies and the<br />

mid−infrared luminosity <strong>of</strong> AGN−related power law emission. In addition, the IRAC<br />

images will allow us to study the environment <strong>of</strong> these most massive 3CR sources.<br />

The maps will be large enough to cover the presumed galaxy clusters and deep<br />

enough to detect galaxiesat least ten times fainter than the 3CR sources.<br />

Thursday March 25, 2010 xgal_covers.txt<br />

222/371

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