An accreting black hole model for sagittarius A

Research output: Contribution to journalArticle

156 Citations (Scopus)

Abstract

Several observations, notably of broad He I, Brα, and Brγ emission lines from the vicinity of IRS 16, indicate the presence of a strong circumnuclear wind near the dynamical center of the Galaxy. Sgr A*, a hypothesized supermassive object situated ≈0.06 pc to the west of IRS 16, should be accreting from this wind if it is not itself a source of gaseous outflow, for which there is currently no observational evidence. Here, we calculate the spectrum and flux of radiation resulting from this process, and show that they are consistent with the data over at least 12 decades of frequency. Together with the kinematic studies of the stellar and gas distributions in this region, our model argues strongly in favor of Sgr A * being a ≳ 106 M black hole.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume387
Issue number1 PART 2
StatePublished - Mar 1 1992

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Indian spacecraft
outflow
kinematics
galaxies
radiation
gases
gas
distribution

Keywords

  • Black hole physics
  • Galaxy: center
  • Stars: mass loss
  • Stars: Wolf-Rayet

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

An accreting black hole model for sagittarius A. / Melia, Fulvio.

In: Astrophysical Journal, Vol. 387, No. 1 PART 2, 01.03.1992.

Research output: Contribution to journalArticle

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AB - Several observations, notably of broad He I, Brα, and Brγ emission lines from the vicinity of IRS 16, indicate the presence of a strong circumnuclear wind near the dynamical center of the Galaxy. Sgr A*, a hypothesized supermassive object situated ≈0.06 pc to the west of IRS 16, should be accreting from this wind if it is not itself a source of gaseous outflow, for which there is currently no observational evidence. Here, we calculate the spectrum and flux of radiation resulting from this process, and show that they are consistent with the data over at least 12 decades of frequency. Together with the kinematic studies of the stellar and gas distributions in this region, our model argues strongly in favor of Sgr A * being a ≳ 106 M⊙ black hole.

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