Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..360..127a&link_type=abstract
AGN Variability from X-Rays to Radio Waves ASP Conference Series, Vol. 360, Proceedings of the conference held 14-16 June, 2004
Astronomy and Astrophysics
Astrophysics
Scientific paper
We used a ˜ 300 ks long XMM-Newton observation of MCG-6-30-15 to study the correlation between the 0.2-10 keV X-ray and the 3000-4000 Å U bands. The light curves are well correlated with a time lag of τ_{max}˜ 160 ks where the U-band variations lead the variations in the X-ray band. This result gives evidence for Comptonisation scenarios where the X-rays are produced through Compton up-scattering of hard UV seed photons, as this process naturally predicts the observed soft U-band variations will precede similar flux variations in the X-rays. The length of the time lag favours models where the observed U band and seed photon emitting regions are connected by perturbations of the accretion flow traveling inwards through the disc affecting first the observed U-band emitting radii and then the innermost region where the bulk of the seed photons are expected to be produced. Finally, the absence of a positive correlation,where X-ray flux variations precede the U-band variations, indicates that the observed U band photons are not mainly produced through reprocessing of X-rays in this source.
Arevalo Patricia
Brinkmann Wolfgang
Kuhlbrodt B.
Papadakis Iosif
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