Vol 20, No 7

Disk evolution of the M87’s nucleus observed in 2008

Fei Xiang, Cheng Cheng


Abstract We report the discovery of year-scale X-ray variation in the nuclear region of the M87 by reanalyze the eight Chandra observations from 2007 to 2008. The X-ray spectra are fitted and decomposed into disk and flaring components. This year-scale X-ray variability can be explained quite well by a simple clumpy accretion model. We conclude that the central super-massive black hole of M87 was accreting a cloud of ∼ 0.5 M⊙ at that time


Keywords galaxies: active — X-ray: individual: M87

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