Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 667/742 Spitzer Space Telescope − General Observer Proposal #50119 IRS observations of a new population of massive high−z galaxies discovered by SWIRE and MAMBO Principal Investigator: Guilaine Lagache Institution: Institut d’Astrophysique Spatiale Technical Contact: Guilaine Lagache, Institut d’Astrophysique Spatiale Co−Investigators: Nicolas Fiolet, IAP, France Maria Polletta, IAP, France Alain Omont, IAP, France Francois Boulanger, IAS, France Andrew Baker, Rutgers, US Stefano Berta, MPE, Germany Benjamin Bertincourt, IAS, France Duncan Farrah, Cornell, US Carol Lonsdale, University of Virginia Frazer Owen, NRAO, Socorro, US David Shupe, IPAC, US Lin Yan, SSC, US Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsMap Hours Approved: 54.3 Abstract: We propose to obtain low resolution mid−IR spectra of a sample of 16 SWIRE−selected massive star−forming ULIRGs at z~2, deeply observed at 1.2 mm with IRAM−MAMBO. This sample is complete, with a selection of all sources in 0.5 square degree whose IRAC photometry peaks at 5.8 microns, S(24)>500 microJy and r>23. More than 80% of the sources have S(1.2mm)>~ 1.5 mJy, and are thus submillimeter galaxies (SMGs) with far−IR luminosities greater than a few 10^12 Lo. The sample is thus representative of a rich, Spitzer−selected special subclass of SMGs (~2000 in all SWIRE fields). Compared to sub−mm selected SMGs, these sources are brighter at 24 microns (larger PAH/FIR ratio), and have larger stellar masses. They represent thus an important stage of the assembly of elliptical galaxies already massive at z~2, with a strong, close to ’maximal’, starburst probably triggered by one of the last major gaseous mergers. The sample benefits from exceptionally rich complementary data, with one of the deepest VLA observations and deep 70−160 micron data. We expect that, in most of these objects, the emission is dominated by the starburst in mid−IR (PAHs) and far−IR (thermal dust), but the parallel growth of black holes is also known to be at work in such objects and the lack of AGN signatures in our sample is somehow surprising. The proposed IRS spectra will provide essential information about this important, but poorly studied, sub−class of high z starbursts by: 1) disentangling the mid−IR PAH and AGN contribution; 2) analyzing the detailed properties of their PAH spectrum, in relation with mm, radio and far−IR properties, and comparing with classical SMGs; 3) checking any evidence of silicate absorption; 4) inferring physical and spatial properties of the starburst from this spectral information together with complete multi−wavelength data. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 668/742 Spitzer Space Telescope − General Observer Proposal #20589 The Role of Mergers and Interactions in Luminous and Ultra−Luminous Infra−Red Galaxies Principal Investigator: Claus Leitherer Institution: Space Telescope Science Institute Technical Contact: Joao Leao, Space Telescope Science Institute Co−Investigators: Joao Rodrigo Souza Leao, STScI Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsStare Hours Approved: 13.5 Abstract: We propose a study of Luminous and Ultra−Luminous Infrared galaxies (LIRGs and ULIRGs, respectively) to investigate their energy generating mechanisms and the role played by interactions and mergers in their evolution. These galaxies are gas−rich systems with infrared luminosities in the range log(L_IR) = 11− 12. These systems are mainly found in interacting pairs or groups and most of them have indications of a recent, past or ongoing merger or interaction. Despite the many advances in understanding these galaxies, many questions remain: (i) What is the relative frequency of AGNs and starburst in LIRGs and ULIRGs?, (ii) Is the number of AGN−ULIRGs a function of the infrared luminosity?; (iii) Is the nuclear separation in these galaxies a determinant factor in the appearance of an AGN? To answer these question we propose a IRS spectroscopic survey of 28 LIRGs and ULIRGs in different merger or interaction stages. The plan is to use the low resolution modes of IRS (SL and LL) to cover the 5.2 to 38 um wavelenght range. This wavelength region is rich in high ionization lines and PAH features which can be used as diagnostic indicators of the main energy source in these galaxies: AGN or massive star formation. Thursday March 25, 2010 xgal_covers.txt 334/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 669/742 Spitzer Space Telescope − General Observer Proposal #20496 Comparison of Time−Variable IR and X−Ray Continuum Spectra in Four Blazars Principal Investigator: Alan Marscher Institution: Institute for Astrophysical Research Technical Contact: Alan Marscher, Institute for Astrophysical Research Co−Investigators: Svetlana Jorstad, IAR BU USA Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: MipsPhot Hours Approved: 9.7 Abstract: We propose a series of far−IR photometric observations of 4 blazars with MIPS at three wavelengths from 24 to 160 microns. We are monitoring these objects in the X−ray with RXTE 2−3 times per week, as well as at optical, near−IR, and radio wavelengths with ground−based telescopes. The sample consists of two quasars with extremly relativistic jets (3C 279 and PKS 1510−089), a quasar with Seyfert−like optical and X−ray emission but blazar characteristics in the radio (3C~273), and BL Lac. For each object, this program will (1) fill the expansive IR gap in the time−variable spectral energy distribution, (2) determine the time scale and magnitude of far−IR flux and spectral index variability, (3) establish the relationship between the X−ray and far−IR spectral indices and how this changes with flux level and overall shape of the SED, and (4) sample the flux variability at far−IR wavelengths and measure time lags relative to fluctuations at other wavebands. This is critical information for testing models for the X−ray emission and for indicating the extent to which the IR emission is co−spatial with that in other spectral domains. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 670/742 Spitzer Space Telescope − General Observer Proposal #50688 The Near and Far−IR SEDs of Spitzer GTO ULIRGs Principal Investigator: Jason Marshall Institution: California Institute of Technology Technical Contact: Jason Marshall, California Institute of Technology Co−Investigators: Lee Armus, SSC Henrik Spoon, Cornell University Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IracMap MipsPhot Hours Approved: 7.3 Abstract: Spectra of a sample of 109 ultraluminous infrared galaxies (ULIRGs) have been obtained as part of the Spitzer IRS GTO program, providing a dataset with which to study the underlying obscured energy source(s) (i.e., AGN and/or starburst activity) powering ULIRGs in the local universe, and providing insight into the high−redshift infrared−luminous galaxies responsible for the bulk of the star−formation energy density at z = 2−3. As part of this effort, we have developed the CAFE spectral energy distribution decomposition tool to analyze the UV to sub−mm SEDs of these galaxies (including their IRS spectra). Sufficient photometry for these decompositions exists for approximately half of the GTO ULIRGs. However, we lack crucial data for the other half of the sample in either or both the 2−5 micron gap between the near−IR passbands and the start of the IRS wavelength coverage and the far−IR beyond 100 microns. These spectral regions provide critical constraints on the amount of hot dust near the dust sublimation temperature (indicating the presence of an AGN) and the total luminosity and mass of dust in the galaxy (dominated by the coldest dust emitting at far−IR wavelengths). We therefore propose to obtain IRAC observations in all channels and MIPS observations at 70 and 160 microns for the 37 and 17 GTO ULIRGs lacking data in these wavelength ranges, respectively. Considering its very low cost of 7.3 total hours of observation, the scientific return from this program is enormous: nearly doubling the number of GTO ULIRGs with full spectral coverage, and completing a dataset that is sure to be an invaluable resource well beyond the lifetime of Spitzer. Thursday March 25, 2010 xgal_covers.txt 335/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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