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Disk evolution of the M87's nucleus observed in 2008

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arxiv 2002.09122 v1 pith:PDEHVI72 submitted 2020-02-21 astro-ph.HE astro-ph.GA

Fei Xiang , Cheng Cheng This is my paper · ORCID
classification astro-ph.HEastro-ph.GA
keywords x-raydiskyear-scaleaccretingaccretionblackcentralchandra
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abstract

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.

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