How fast can an AGN shut down? XMM-Newton observation of IC 2497

Details How fast can an AGN shut down? XMM-Newton observation of IC 2497 How fast can an AGN shut down? XMM-Newton observation of IC 2497

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008xmm..prop...70s&link_type=abstract

XMM-Newton Proposal ID #06026901

Physics

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Ic2497

Scientific paper

We propose to observe IC 2497 with XMM-Newton to detect, or rule out, an obscured AGN that might account for the illumination of `Hanny's Voorwerp'. The Voorwerp is a highly ionised cloud of gas extended over 15-25 kpc next to the spiral galaxy IC 2497. There is no source of ionisation within the Voorwerp, implicating a luminous 1E44 erg/s AGN in IC 2497 as the source. Swift XRT observations do not yield a detection, allowing the presence of a highly obscured, sufficiently luminous AGN. With 34 ksec of XMM observations, we could detect an obscured AGN down to 1E42 erg/s. We can thus either locate an obscured AGN, or we can for the first time constrain the shutdown time scale for a powerful AGN, as it drops by a factor of 100 in luminosity in 1E5 years.

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