| Name | OT2_lyan_5 |
| Title | Probing Physical State of ISM in IR Bright QSOs Discovered by WISE and SDSS |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342251203&instrument_name=PACS&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/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, OI63um and CII158um. 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 |
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| 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 µm range, bridging the gap between earlier infrared space missions and groundbased facilities. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2013-08-10T13:54:10Z |
| Keywords | Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, yan et al., 2013, 'Probing Physical State of ISM in IR Bright QSOs Discovered by WISE and SDSS', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-hk4lphz |