Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 555/742 Spitzer Space Telescope − General Observer Proposal #50558 The importance of starbursts in powerful radio galaxies Principal Investigator: Clive Tadhunter Institution: University of Sheffield Technical Contact: Clive Tadhunter, University of Sheffield Co−Investigators: Dan Dicken, University of Sheffield Raffaella Morganti, ASTRON David Axon, RIT Jo Holt, University of Leiden Ilse van Bemmel, University of Leiden Peter Barthel, University of Groningen Katherine Inskip, University of Sheffield Bjorn Emonts, Columbia University Rosa Gonzalez Delgado, IAA, Granada Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 32.0 Abstract: The heating mechanism for the warm/cool dust in active galaxies has long been a source of uncertainty that limits our ability to understand the links between the evolution of AGN and their host galaxies. In order to address this issue we have used deep Spitzer/MIPS observations for a complete sample of 2Jy radio galaxies to investigate the links between the mid− to far−IR (MFIR) continuum luminosities and the level of both the AGN and the optical starburst activity. In a major breakthrough we find strong correlations between the [OIII] emission line luminosities and both the 24 and 70 micron continuum luminosities, however, the objects in our sample with evidence for optical star formation activity show significantly enhanced 70 micron luminosities compared with the main correlation. On the basis of these results, we hypothesise that AGN illumination is the primary heating mechanism for the dust emitting at both 24 and 70 microns, but the 70 micron luminosity is substantially boosted by starburst heating in the 20 − 30% of objects with independent evidence for starburst activity. We now propose to test this hypothesis by using deep IRS spectroscopy to measure the strengths of the mid−IR PAH features in the 2Jy sample, which is unique in terms of its completness and availability of deep optical spectroscopy and MFIR photometry. If our hypothesis is correct we expect the objects with enhanced 70 micron luminosities to have PAH bands that are strong relative to their MFIR continuum and high ionization emission lines, whereas the objects falling on the main correlation will have weak or absent PAH emission. Combined with the existing MIPS and optical spectroscopic data, the IRS observations will for the first time enable us to definitively establish the significance of circum−nuclear starbursts in powerful radio galaxies. They will also allow a crucial comparison of the various methods used to quantify the starbursts associated with AGN at both low and high redshifts. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 556/742 Spitzer Space Telescope − General Observer Proposal #20199 Radio Galaxies at Very High Redshift Principal Investigator: David Thompson Institution: California Institute of Technology Technical Contact: David Thompson, California Institute of Technology Co−Investigators: Dan Stern, SSC/JPL Carlos De Breuck, ESO Wendy Lane Peters, Naval Research Laboratory Aaron Cohen, Naval Research Laboratory Tracy Clarke, Naval Research Laboratory George Djorgovski, California Institute of Technology Ashish Mahabal, California Institute of Technology Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap Hours Approved: 10.0 Abstract: We have identified four faint (K>22 mag) and one exceptionally faint (K~23.5 mag) near−infrared counterparts to high−latitude, steep−spectrum, compact radio sources. They are likely to be radio galaxies at very high (z>5) redshift, placing them amongst the most powerful radio sources at any redshift. Deep IRAC imaging will be used to confirm the identifications and constrain the redshifts through their spectral energy distributions. Thursday March 25, 2010 xgal_covers.txt 278/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 557/742 Spitzer Space Telescope − General Observer Proposal #30854 IRAC Survey of Large−scale Quasar Jets Principal Investigator: Yasunobu Uchiyama Institution: ISAS/JAXA Technical Contact: Yasunobu Uchiyama, ISAS/JAXA Co−Investigators: Teddy Cheung, Stanford University Meg Urry, Yale University Paolo Coppi, Yale University Jeffrey Van Duyne, Yale University Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap Hours Approved: 20.8 Abstract: Motivated by the success of our pilot Cycle−1 observations, we here propose a systematic IRAC imaging program of powerful quasar jets. Specifically, we propose to perform: (a) moderately deep [1 hr each] IRAC imaging of 10 powerful jets to make a complete set of infrared data for quasar jets detected by Chandra, and (b) very deep [7 hr] IRAC imaging of the 3C 273 jet as a follow−up to our Cycle−1 program. By exploring the mid−infrared properties of the extended jet emission from powerful quasars, this IRAC program will shed new light on the riddle of the Chandra−detected jets. Our scientific goals are: (1) determining the peak position of the synchrotron radiation component, which is connected directly with the maximum energy of the ultrarelativistic electrons in the jets and reflects from nature of the acceleration process, (2) measuring the spectral shape in the IRAC band to test whether the optical emission is belonging to the radio−infrared synchrotron component, and (3) searching for an infrared bump due to ‘‘bulk Comptonization’’, which if detected, gives strong confirmation of the beamed IC model. Together with extensive surveys with both HST and Chandra, our Spitzer survey will aid in the understanding of the physics of the extragalactic jets. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 558/742 Spitzer Space Telescope − General Observer Proposal #20733 IRS Spectroscopy of Intermediate Redshift AGN in the GOODS Field: A study in AGN dust structure and evolution Principal Investigator: Megan Urry Institution: Yale University Technical Contact: Jeffrey Van Duyne, Yale University Co−Investigators: Jeffrey Van Duyne, Yale University Anton Koekemoer, STScI Franz Bauer, Columbia University Haojing Yan, CalTech/IPAC Glenn Morrison, NOAO Eleni Chatzichristou, U. of Athens Science Category: AGN/quasars/radio galaxies Observing Modes: IrsStare Hours Approved: 59.1 Abstract: We propose Spitzer IRS low resolution spectroscopy of infrared−bright AGN from the GOODS North field. Using the broad wavelength coverage afforded by GOODS, we will examine the continuum emission of obscured AGN whose emission is dominated by dust re−radiation. Hard X−rays are excellent at detecting both obscured and unobscured AGN, as dust does not appreciably absorb such high energy radiation except when Compton−thick. Both hard X−ray and infrared emission is required to investigate the evolution of the surrounding dust torus geometry during the peak AGN epoch. These sources have been selected to be moderate luminosity AGN at redshifts 0.48
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