Negative X-ray reverberation time delays from MCG-6-30-15 and Mrk 766

作者：Emmanoulopoulos D^*; McHardy I M; Papadakis I E

来源：Monthly Notices of the Royal Astronomical Society, 2011, 416(1): L94-L98.

DOI：10.1111/j.1745-3933.2011.01106.x

• black hole physics
• galaxies: individual: MCG-6-30-15
• galaxies: individual: Mrk 766
• X-rays: galaxies
• galaxies: nuclei
• galaxies: Seyfert

We present an X-ray time lag analysis, as a function of Fourier frequency, for MCG-6-30-15 and Mrk 766 using long-term XMM-Newton light curves in the 0.5-1.5 and the 2-4 keV energy bands, together with some physical modelling of the corresponding time lag spectra. Both the time lag spectra of MCG-6-30-15 and Mrk 766 show negative values (i. e. soft band variations lag behind the corresponding hard band variations) at high frequencies, around 10(-3) Hz, similar to those previously observed from 1H 0707-495. The remarkable morphological resemblance between the time lag spectra of MCG-6-30-15 and Mrk 766 indicate that the physical processes responsible for the observed soft time delays are very similar in the two sources, favouring a reflection scenario from material situated very nearby to the central black hole.

• 出版日期2011-9