The event horizon of M87

Avery E. Broderick, Ramesh Narayan, John Kormendy, Eric S. Perlman, Marcia J Rieke, Sheperd S. Doeleman

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The 6 × 10<sup>9</sup> MO supermassive black hole at the center of the giant elliptical galaxy M87 powers a relativistic jet. Observations at millimeter wavelengths with the Event Horizon Telescope have localized the emission from the base of this jet to angular scales comparable to the putative black hole horizon. The jet might be powered directly by an accretion disk or by electromagnetic extraction of the rotational energy of the black hole. However, even the latter mechanism requires a confining thick accretion disk to maintain the required magnetic flux near the black hole. Therefore, regardless of the jet mechanism, the observed jet power in M87 implies a certain minimum mass accretion rate. If the central compact object in M87 were not a black hole but had a surface, this accretion would result in considerable thermal near-infrared and optical emission from the surface. Current flux limits on the nucleus of M87 strongly constrain any such surface emission. This rules out the presence of a surface and thereby provides indirect evidence for an event horizon.

Original languageEnglish (US)
Article number179
JournalAstrophysical Journal
Volume805
Issue number2
DOIs
StatePublished - Jun 1 2015

Fingerprint

event horizon
accretion
accretion disks
elliptical galaxies
confining
horizon
light emission
magnetic flux
near infrared
telescopes
electromagnetism
wavelength
nuclei
wavelengths
energy

Keywords

  • black hole physics
  • galaxies: individual (M87)
  • gravitation
  • infrared: galaxies
  • radio continuum: galaxies
  • ultraviolet: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Broderick, A. E., Narayan, R., Kormendy, J., Perlman, E. S., Rieke, M. J., & Doeleman, S. S. (2015). The event horizon of M87. Astrophysical Journal, 805(2), [179]. https://doi.org/10.1088/0004-637X/805/2/179

The event horizon of M87. / Broderick, Avery E.; Narayan, Ramesh; Kormendy, John; Perlman, Eric S.; Rieke, Marcia J; Doeleman, Sheperd S.

In: Astrophysical Journal, Vol. 805, No. 2, 179, 01.06.2015.

Research output: Contribution to journalArticle

Broderick, AE, Narayan, R, Kormendy, J, Perlman, ES, Rieke, MJ & Doeleman, SS 2015, 'The event horizon of M87', Astrophysical Journal, vol. 805, no. 2, 179. https://doi.org/10.1088/0004-637X/805/2/179
Broderick AE, Narayan R, Kormendy J, Perlman ES, Rieke MJ, Doeleman SS. The event horizon of M87. Astrophysical Journal. 2015 Jun 1;805(2). 179. https://doi.org/10.1088/0004-637X/805/2/179
Broderick, Avery E. ; Narayan, Ramesh ; Kormendy, John ; Perlman, Eric S. ; Rieke, Marcia J ; Doeleman, Sheperd S. / The event horizon of M87. In: Astrophysical Journal. 2015 ; Vol. 805, No. 2.
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