Preprint Review Version 1 Preserved in Portico This version is not peer-reviewed

M87 Supermassive Black Hole Review

Version 1 : Received: 19 May 2021 / Approved: 20 May 2021 / Online: 20 May 2021 (11:45:25 CEST)

How to cite: Ganguly, M. M87 Supermassive Black Hole Review. Preprints 2021, 2021050487. Ganguly, M. M87 Supermassive Black Hole Review. Preprints 2021, 2021050487.


M87 is a giant elliptical galaxy in the Virgo cluster of galaxies. The radio source has a core which coincides with the nucleus of the galaxy and a jet of emission which is detected from radio to X-ray bands. A supermassive black hole is assumed to be at the centre of M87 which sends out relativistic particles in the form jets along its axis of rotation. Relativistic particles accelerated in a magnetic field, give out synchrotron radiation. The centre is surrounded by an accretion disc, which is the closest that we can probe into a black hole. High resolution observations are needed to examine the nature of the radio emission closest to the centre of M87. An array of millimetre-band telescopes across the globe were used as an interferometer, called the Event Horizon Telescope, (EHT) to probe the nuclear region. The angular resolution of this interferometer array is 25 microarc sec, at a wavelength of 1.3mm and the data was carefully calibrated and imaged. The resulting image shows an asymmetric ring which is consistent with the predictions of strong gravitational lensing of synchrotron emission from hot plasma near the event horizon. In this paper, we review the results of the observations of the radio galaxy, M87, using the Event Horizon Telescope


black hole; supermassive black hole; black hole physics; M87 galaxies; gravitation; Event Horizon; telescope; observational astronomy


Physical Sciences, Acoustics

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