A dataset provided by the European Space Agency

Name OT2_cleipski_1
Title Confirm the absence of warm dust (T < 300 K) in the cores of six high redshift quasars.
URL

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DOI 10.5270/esa-jrc1fdb
Author leipski, c.
Description Our Herschel key project "The Dusty Young Universe" observed 71 quasars at the highest redshifts (z > 5) with PACS and SPIRE. Similar to the local universe we find that the hottest, AGN heated dust shows a flat or slightly rising spectral energy distribution in nuF_nu between 24mu (Spitzer) and PACS 100mu (i.e. rest-frame 3.4mu < lambda_rest < 14mu at z=6). However, in the course of the project we identified some exceptional cases that are undetected by PACS at 100mu. Their upper limits result in nuF_nu(100mu) < 0.8*nuF_nu(24mu) indicating a deficit of cooler dust below T ~ 300 K. Such cases are not known among AGN in the local universe and seem to require a very compact central dust distribution. Here we propose to re-observe the best six of these exceptional quasars with PACS at 100 and 160mu with a threefold integration time in order to reach a factor of 2 deeper in flux when combining with the already acquired data. Both a successful detection or a substantially lowered upper limit will allow us to determine the temperature of the hot dust better and estimate its total mass. The small radius of the dust distribution might indicate dust production near the quasar core. PACS on Herschel is the unique facility to investigate the apparent differences of the dust distributions in quasars between the young universe and today.
Publication
Instrument PACS_PacsPhoto_largeScan
Temporal Coverage 2012-11-19T13:02:21Z/2013-01-18T06:39:17Z
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 2013-07-18T06:15:53Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-07-18T06:15:53Z, OT2_cleipski_1, SPG v14.2.0. https://doi.org/10.5270/esa-jrc1fdb