Tightly constraining the Timescale-Mass-Accretion rate relationship in AGN

Details Tightly constraining the Timescale-Mass-Accretion rate relationship in AGN Tightly constraining the Timescale-Mass-Accretion rate relationship in AGN

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008xmm..prop..159m&link_type=abstract

XMM-Newton Proposal ID #06058002

Physics

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Ngc 7213, Fairall 9

Scientific paper

We have previously shown that AGN have a characteristic time-scale, Tb , which scales roughly as Mmdot (ie mass/accretion rate in Eddington units). However the range of M and mdot covered is not large and hence the dependency on mdot could vary between ~mdot^(-0.6) and mdot^(-1.3) (90% confidence), with similar mass uncertainties. Understanding this scaling relationship is crucial to our understanding of the accretion process. Therefore, particularly as some researchers have questioned any dependence on mdot, it is crucial to reduce the uncertainties by a factor of 2. The best way to do that is to add one orbit of XMM observations to existing RXTE monitoring to determine Tb in 2 extreme AGN, one with mdot x10 lower, and 1 with mass x10 higher, than previously observed.

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