期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 488, 期 1, 页码 L90-L93出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/slz108
关键词
radio continuum: general; Galaxies: Supermassive black holes
资金
- National Science Foundation [AST14-07835]
- NASA [NNX15AK82G]
- JTF grant
- Black Hole Initiative at Harvard University - JTF grant
- NASA [NNX15AK82G, 808066] Funding Source: Federal RePORTER
The Event Horizon Telescope, a global very long baseline interferometric array observing at a wavelength of 1.3 mm, detected the first image of the M87 supermassive black hole (SMBH). M87 is a giant elliptical galaxy at the centre of the Virgo cluster, which is expected to have formed through merging of cluster galaxies. Consequently M87* hosted mergers of black holes through dynamical friction and could have one or multiple binary companions with a low mass ratio at large separations. We show that a long-term monitoring of the M87 SMBH image over similar to 1 yr with absolute positional accuracy of 1 approximate to mu as could detect such binary companions and exclude a large parameter space in semimajor axis (a(0)) and mass ratio (q), which is currently not constrained. Moreover, the presence of the accretion disc around M87* excludes a binary companion with a(0) approximate to of the order of a milliparsec, as otherwise the accretion disc would have been tidally disrupted.
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