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Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre | | F. K. Baganoff
; M. W. Bautz
; W. N. Brandt
; G. Chartas
; E. D. Feigelson
; G. P. Garmire
; Y. Maeda
; M. Morris
; G. R. Ricker
; L. K. Townsley
; F. Walter
; | | Date: |
21 Sep 2001 | | Journal: | Nature, Vol. 413, pp. 45-48 (2001) | | Subject: | astro-ph | | Affiliation: | 2,3), M. Morris , G. R. Ricker , L. K. Townsley , and F. Walter ( MIT, Penn State, ISAS, UCLA, Caltech | | Abstract: | Most galactic nuclei are now believed to harbour supermassive black holes. Studies of stellar motions in the central few light-years of our Milky Way Galaxy indicate the presence of a dark object with a mass of about 2.6 million solar masses. This object is spatially coincident with Sagittarius A* (Sgr A*), the unique compact radio source located at the dynamical centre of our Galaxy. By analogy with distant quasars and nearby active galactic nuclei (AGN), Sgr A* is thought to be powered by the gravitational potential energy released by matter as it accretes onto a supermassive black hole. However, Sgr A* is much fainter than expected in all wavebands, especially in X-rays, casting some doubt on this model. Recently, we reported the first strong evidence of X-ray emission from Sgr A*. Here we report the discovery of rapid X-ray flaring from the direction of Sgr A*. These data provide compelling evidence that the X-ray emission is coming from accretion onto a supermassive black hole at the Galactic Centre, and the nature of the variations provides strong constraints on the astrophysical processes near the event horizon of the black hole. | | Source: | arXiv, astro-ph/0109367 | | Other source: | [GID 463730] pmid11544519 | | Services: | Forum | Review | PDF | Favorites | |
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