SIMBAD references

2016ApJ...830...17B - Astrophys. J., 830, 17-17 (2016/October-2)

An improved distance and mass estimate for Sgr A* from a multistar orbit analysis.

BOEHLE A., GHEZ A.M., SCHODEL R., MEYER L., YELDA S., ALBERS S., MARTINEZ G.D., BECKLIN E.E., DO T., LU J.R., MATTHEWS K., MORRIS M.R., SITARSKI B. and WITZEL G.

Abstract (from CDS):

We present new, more precise measurements of the mass and distance of our Galaxy's central supermassive black hole, Sgr A*. These results stem from a new analysis that more than doubles the time baseline for astrometry of faint stars orbiting Sgr A*, combining 2 decades of speckle imaging and adaptive optics data. Specifically, we improve our analysis of the speckle images by using information about a star's orbit from the deep adaptive optics data (2005-2013) to inform the search for the star in the speckle years (1995-2005). When this new analysis technique is combined with the first complete re-reduction of Keck Galactic Center speckle images using speckle holography, we are able to track the short-period star S0-38 (K-band magnitude=17, orbital period=19 yr) through the speckle years. We use the kinematic measurements from speckle holography and adaptive optics to estimate the orbits of S0-38 and S0-2 and thereby improve our constraints of the mass (Mbh) and distance (Ro) of Sgr A*: Mbh=(4.02±0.16±0.04) x 106 M and 7.86±0.14±0.04 kpc. The uncertainties in Mbh and Ro as determined by the combined orbital fit of S0-2 and S0-38 are improved by a factor of 2 and 2.5, respectively, compared to an orbital fit of S0-2 alone and a factor of ∼2.5 compared to previous results from stellar orbits. This analysis also limits the extended dark mass within 0.01 pc to less than 0.13 x 106 M at 99.7% confidence, a factor of 3 lower compared to prior work.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrometry - Galaxy: center - Galaxy: fundamental parameters - infrared: stars - quasars: supermassive black holes - techniques: high angular resolution - techniques: high angular resolution

VizieR on-line data: <Available at CDS (J/ApJ/830/17): table6.dat>

Nomenclature: Table 6: [GKM98] S6-NNN (Nos S6-182 to S6-185) added, [GKM98] S7-NNN (Nos S7-112 and S7-114) added, [GKM98] S8-NNN (Nos S8-125 to S8-130) added, [GKM98] S9-NNN N=9 among (Nos S9-117 to S9-293) added, [GKM98] S10-NNN N=7 among (Nos S10-096 to S10-113) added, [GKM98] S11-NNN N=4 among (Nos S11-93 to S11-98) added, [GKM98] S12-NNN N=6 among (Nos S12-076 to S12-129) added, [GKM98] S13-NNN N=4 among (Nos S13-065 to S13-068) added, [GKM98] S14-NNN N=3 among (Nos S14-058 to S14-177) added, [GKM98] S15-NNN N=3 among (Nos S15-038 to S15-042) added, [GKM98] S17-NNN (No S17-013) added.

Simbad objects: 967

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2020.01.22-07:07:00

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