Measuring the Black Hole Spin in Sgr A*

Details Measuring the Black Hole Spin in Sgr A* Measuring the Black Hole Spin in Sgr A*

2001-05-11

arxiv.org/abs/astro-ph/0105188v1

The Astrophysical Journal, Vol.554,Issue 1,pp.L37-L40

Astronomy and Astrophysics

Astrophysics

15 pages, 1 figures. Accepted for publication in ApJ Letters

Scientific paper

10.1086/320918

The polarized mm/sub-mm radiation from Sgr A* is apparently produced by a Keplerian structure whose peak emission occurs within several Schwarzschild radii (r_S=2GM/c^2) of the black hole. The Chandra X-ray counterpart, if confirmed, is presumably the self-Comptonized component from this region. In this paper, we suggest that sub-mm timing observations could yield a signal corresponding to the period P_0 of the marginally stable orbit, and therefore point directly to the black hole's spin a. Sgr A*'s mass is now known to be (2.6\pm 0.2)\times 10^6 M_\odot (an unusually accurate value for supermassive black hole candidates), for which 2.7 min

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