MEASURING mass accretion rate onto the supermassive black hole in M87 using faraday rotation measure with the submillimeter array

C. Y. Kuo, K. Asada, R. Rao, M. Nakamura, J. C. Algaba, H. B. Liu, M. Inoue, P. M. Koch, P. T.P. Ho, S. Matsushita, H. Y. Pu, K. Akiyama, H. Nishioka, N. Pradel

研究成果: 雜誌貢獻期刊論文同行評審

84 引文 斯高帕斯(Scopus)

摘要

We present the first constraint on the Faraday rotation measure (RM) at submillimeter wavelengths for the nucleus of M87. By fitting the polarization position angles (χ) observed with the Submillimeter Array at four independent frequencies around 230 GHz and interpreting the change in χ as a result of external Faraday rotation associated with accretion flow, we determine the RM of the M87 core to be between -7.5 × 105 and 3.4 × 105 rad m-2. Assuming a density profile of the accretion flow that follows a power-law distribution and a magnetic field that is ordered, radial, and has equipartition strength, the limit on the RM constrains the mass accretion rate to be below 9.2 10-4 M yr-1 at a distance of 21 Schwarzschild radii from the central black hole. This value is at least two orders of magnitude smaller than the Bondi accretion rate, suggesting significant suppression of the accretion rate in the inner region of the accretion flow. Consequently, our result disfavors the classical advection-dominated accretion flow and prefers the adiabatic inflow-outflow solution or convection-dominated accretion flow for the hot accretion flow in M87.

原文英語
文章編號L33
期刊Astrophysical Journal Letters
783
發行號2
DOIs
出版狀態已發佈 - 2014 三月 10
對外發佈

ASJC Scopus subject areas

  • 天文和天體物理學
  • 空間與行星科學

指紋

深入研究「MEASURING mass accretion rate onto the supermassive black hole in M87 using faraday rotation measure with the submillimeter array」主題。共同形成了獨特的指紋。

引用此