Gravitationally redshifted emission implying an accretion disk and massive black hole in the active galaxy MCG–6–30–15

@article{Tanaka1995GravitationallyRE,
  title={Gravitationally redshifted emission implying an accretion disk and massive black hole in the active galaxy MCG–6–30–15},
  author={Y. Tanaka and K. Nandra and Andrew C. Fabian and Hajime Inoue and Chiko Otani and Tadayasu Dotani and Kiyoshi Hayashida and Kazushi Iwasawa and Tsuneo Kii and Hideyo Kunieda and F. Makino and Masaru Matsuoka},
  journal={Nature},
  year={1995},
  volume={375},
  pages={659-661}
}
ACTIVE galactic nuclei and quasars are probably powered by the accretion of gas onto a supermassive black hole at the centre of the host galaxy1, but direct confirmation of the presence of a black hole is hard to obtain. As the gas nears the event horizon, its velocity should approach the speed of light; the resulting relativistic effects, and a gravitational redshift arising from the proximity to the black hole, should be observable, allowing us to test specific predictions of the models with… 
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