Testing strong gravity in the NLS1 PKS 0558-504

Details Testing strong gravity in the NLS1 PKS 0558-504 Testing strong gravity in the NLS1 PKS 0558-504

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop..158p&link_type=abstract

XMM-Newton Proposal ID #05551701

Physics

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Pks 0558-504, Xmm-Newton Proposal Id #05551701

Scientific paper

We propose to observe the radio-loud NLS1 galaxy PKS~0558--504 with XMM for five orbits (650 ksec). There has been evidence for QPOs with time scales of 7 ksec and 21 ksec in previous short XMM observations. These time scales are near a frequency ratio of 3:1, a well known result from Galactic Black Hole binaries. The main aims of the proposed XMM observation are to confirm the presence of a QPO like feature at 7 ksec, to search for evidence for the associated 21 ksec modulation, and for the third possible time scale of 14 ks (the one with a 3:2 frequency ratio). Confirmation of the presence of these time scales will provide a unique probe of strong gravity in the vicinity of an AGN black hole.

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