Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 435/742 Spitzer Space Telescope − General Observer Proposal #40356 Evolution of Hot Dust Emission in z>6 Quasars Principal Investigator: Xiaohui Fan Institution: University of Arizona Technical Contact: Xiaohui Fan, University of Arizona Co−Investigators: Linhua Jiang, University of Arizona Niel Brandt, Penn State Chris Carilli, NRAO Dean Hines, Space Science Institute Klaus Meisenheimer, MPIA Gordon Richards, Drexel University Michael Strauss, Princeton Fabian Walter, MPIA Ran Wang, NRAO Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap IrsPeakupImage MipsPhot Hours Approved: 14.9 Abstract: Strong hot dust emission from dust torus surrounding the central engine is an ubiquitous feature among Type−1 quasars at low redshift. In our previous GTO and GO−1 Spitzer programs, we observed a sample of quasars at 46. All objects have excellent multiwavelength data, with BH mass estimates based on broad emission line width, and are GTO targets for Herschel at far−IR. With the combined Cycle 1/4 sample, we will (a) measure the fraction of quasars without hot dust emission at early epoch; (b) test the relation between hot dust properties and emission line properties, BH masses and accretion rates in quasars; (c) improve quasar IR SED measurements at z>6, and (d) probe the relation between hot and warm/cool dust traced by Herschel and sub/mm observations. In particular, three quasars in our new sample have similar emission line and BH properties to the two IR−weak quasars we found previously. We predict that they are likely candidates of new dust−deficient quasars at z>6. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 436/742 Spitzer Space Telescope − General Observer Proposal #50681 Are Narrow−line Type−1 Quasars Deficient of Hot Dust? Principal Investigator: Xiaohui Fan Institution: The University of Arizona Technical Contact: Linhua Jiang, University of Arizona Co−Investigators: Yue Shen, Princeton University Michael Strauss, Princeton University Marianne Vestergaard, University of Arizona Linhua Jiang, University of Arizona Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap MipsPhot IrsPeakupImage Hours Approved: 14.2 Abstract: One of the most surprising results from our previous Spitzer observations is the discovery of a class of quasars at z ~ 6 without detectable hot dust emission in the mid−IR. These objects have the narrowest emission lines at z ~ 6 with FWHM ~ 1600 km/s, but share all other characteristics of normal type−1 quasars in their broad−band SEDs from X−ray to radio. Based on virial mass estimates, they have relatively small black hole (BH) masses and high Eddington luminosity ratios. The existence of such objects may indicate strong evolution in dust properties at early epochs; alternatively, it could be an orientation effect and challenge the standard AGN unification model. No such narrow−line type−1 quasars without hot dust emission have been found at low redshift. However, these objects are very rare, counting for only one percent of the quasar population at z < 5, and none of them have been observed at the Spitzer sensitivity. Therefore, we propose to carry out four band Spitzer photometry of a sample of 15 luminous narrow−line type−1 quasars at z = 1 − 5 selected from the SDSS quasar catalog. All objects have excellent optical spectroscopy and BH mass measurements. The Spitzer photometry will be used to directly measure the mid−IR hot dust emission in these objects. Combined with Spitzer observations of broad−line quasars and low−redshift Narrow−line Seyfert 1 galaxis, the new Spitzer data will allow us to answer the following questions: (1) How does the fraction of hot−dust−free quasars evolve with redshift; do hot−dust−free quasars only exist at the earliest epochs, or are they common among mature quasars as well? (2) How is the hot dust emission in narrow−line type−1 quasars related to BH mass, accretion rate, luminosity, line of sight obscuration, and emission line wind? The proposed observations will provide crucial probes to the evolution of dust structures in quasars and its relation to BH growth in the early universe. Thursday March 25, 2010 xgal_covers.txt 218/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 437/742 Spitzer Space Telescope − General Observer Proposal #30299 An intensive Spitzer survey of FeLoBAL QSOs Principal Investigator: Duncan Farrah Institution: Cornell University Technical Contact: Duncan Farrah, Cornell University Co−Investigators: Colin Borys, University of Toronto Robert Priddey, University of Hertfordshire Jose Afonso, University of Lisbon Mark Lacy, Spitzer Science Center Science Category: AGN/quasars/radio galaxies Observing Modes: MipsPhot Hours Approved: 9.9 Abstract: We propose MIPS and IRS observations of eight ’FeLoBAL’ quasars. These quasars are characterised by absorption from metastable excited states of iron in their UV spectra, and are currently thought to be extremely rare, with only 40 examples known over the whole sky. Very recent observations have however suggested that FeLoBALs are potentially quite common, and that they may represent a critical point in the lifetime of an IR−luminous galaxy when an obscured starburst is approaching its end, and a youthful quasar is starting to emerge from its dust cocoon. In this proposal, we aim to use Spitzer to test this hypothesis. We will use the MIPS data to see if FeLoBALs as a class are preferentially associated with heavily obscured starbursts, and use the IRS spectra to see if the mid−IR emission from FeLoBALs is consistent with an evolutionary sequence from ULIRG to FeLoBAL, through to optical QSO. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 438/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40374 Do FeLoBALs mark the transition between a ULIRG and a QSO? Principal Investigator: Duncan Farrah Institution: Cornell University Technical Contact: Duncan Farrah, Cornell University Co−Investigators: Colin Borys, University of Toronto Robert Priddey, University of Hertfordshire Jose Afonso, University of Lisbon Mark Lacy, Spitzer Science Center James Houck, Cornell University Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 14.0 Abstract: We propose deep IRS observations of six Spitzer/MIPS detected ’FeLoBAL’ quasars. These quasars are characterised by iron absorption in their UV spectra. Once thought to be extremely rare, recent observations have however suggested that FeLoBALs may be common, and might represent a critical point in the lifetime of an IR−luminous galaxy when an obscured starburst is approaching its end, and a youthful quasar is starting to emerge from its dust cocoon. We have used Spitzer to observe seven FeLoBAL QSOs, and found that all seven are bright in the IR, and likely contain both luminous, dusty AGN and intense, obscured star formation. We here seek to use IRS to observe six of these QSOs, to determine whether or not FeLoBALs are a transition type object via direct comparison between their mid−IR spectra and those of ULIRGs and QSOs. Thursday March 25, 2010 xgal_covers.txt 219/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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