Evidence for a 2times 10(6) M_&sun; Black Hole At The Galactic Center From Unresolved Stellar Emission Within 30" of SGR A*

Details Evidence for a 2times 10(6) M_&sun; Black Hole At The Galactic Center From Unresolved Stellar Emission Within 30" of SGR A* Evidence for a 2times 10(6) M_&sun; Black Hole At The Galactic Center From Unresolved Stellar Emission Within 30" of SGR A*

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.3803h&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #38.03; Bulletin of the American Astronomical Society, Vol. 24, p.1178

Astronomy and Astrophysics

Astronomy

3

Scientific paper

Observations are presented of the CO (v=2<-0) 2.3 microns absorption feature from the faint unresolved stellar emission within 30" of Sgr A*. Using the IR Spectrometer Array at the CTIO 4m with a 15" times 1.3" slit oriented in the north-south direction, spectra at 9 positions were sampled at twice the velocity resolution of 100 km sec(-1) pixel(-1) . The CO band strength decreases with decreasing radius and is highly correlated for R_{SgrA*} less than 8.5" (0.33pc for R_0 = 8kpc). The Galactic stellar rotation curve increases with decreasing projected radius with a gradient of 16 km s(-1) arcsec(-1) inside R_{SgrA*} = 10" (0.4pc) where it reaches a minimum ~ 0 km s(-1) . Comparing this result with models of the stellar population shows that the observed emission is predominantly from stars at each projected radius and not from stars at a true radius of R_{SgrA*} = 8.5". Estimates of the enclosed mass vs. radius show there is (2.0 +/- 0.4) times 10(6) M_&sun; inside R_{SgrA*} = 5.2" (0.2pc) with a mass-to-light ratio on the order of 10, which is strong evidence for a massive black hole at the Galactic Center.

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