A dataset provided by the European Space Agency

Name OT2_lyan_5
Title Probing Physical State of ISM in IR Bright QSOs Discovered by WISE and SDSS
URL

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DOI 10.5270/esa-hk4lphz
Author yan, l.
Description Combining WISE and Sloan Digital Sky Survey (SDSS), we have identified a sample of 9 QSOs with flux(22um)>100mJy and with spectroscopic z~0.10.2 for Herscel PACS spectroscopy. Our targets are so bright at 22 micron, even without far-IR observations, their predicted fluxes at 100 micron would exceed 300 mJy based on the type-I QSO SED which has the minimum far-IR emission. For this bright QSO sample, we request a total of 23.8 hours to measure farIR fine structure lines with PACS spectrometer. The extremely bright IR fluxes and the narrow redshift slice allow us to simultaneously observe the two brightest farIR lines, [OI]63um and [CII]158um. We can therefore estimate the line ratios, in combination with PhotoDissociation Region (PDR) models, to provide physical characterization, including gas temperature, density and intensity of UV radiation field, of the warm interstellar medium (ISM) in these luminous objects. The proposed observations will allow us to determine [CII] line and far-IR continuum luminosities. With the [CII]-to-L(FIR) alone, we can already estimate L(FIR)-M(H2) ratio utilizing the published correlation by Gracia-Carpio et al. 2011, thus allowing estimates of molecular gas masses. The farIR continuum estimates, with the four midIR photometry from WISE, can determine if the total IR luminosities could be produced by starbursts, and if so, give estimates of star formation rates. One additional advantage of this sample is that their high SNR SDSS spectra can be used to calculate black hole masses based on fairly reliable low ionization lines. The calculation will allow us to investigat e any relation between black hole properties, including mass and accretion rate, and the gas medium probed by the farIR data. These proposed spectra will contribute to building up a Herschel legacy with farIR spectroscopy dataset which will extend beyond ALMA and JWST.
Publication Properties of Interstellar Medium In Infrared-bright QSOs Probed by [O I] 63 um and [C II] 158 um Emission Lines . Zhao Yinghe et al. . The Astrophysical Journal, Volume 824, Issue 2, article id. 146, 17 pp. (2016). . 824 . 10.3847\/0004-637X\/824\/2\/146 . 2016ApJ...824..146Z ,
Instrument PACS_PacsLineSpec_point
Temporal Coverage 2012-09-19T18:44:10Z/2013-02-10T16:05:41Z
Version SPG v14.2.0
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-08-10T13:54:10Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-08-10T13:54:10Z, OT2_lyan_5, SPG v14.2.0. https://doi.org/10.5270/esa-hk4lphz