http://arxiv.org/abs/2002.09122
We report the discovery of year-scale X-ray variation in the nuclear region of the M87 by reanalyzing the 8 Chandra observations from 2007 to 2008. The X-ray spectra are fitted and decomposed into the 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 the M87 was accreting a cloud of $\sim0.5$M$_\odot$ at that time.
F. Xiang and C. Cheng
Mon, 24 Feb 20
32/49
Comments: 14 pages, 6 figures, accepted by Research in Astronomy and Astrophysics
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