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AN IMPROVED DISTANCEAND MASS ESTIMATE FORSGR A* FROM AMULTISTAR ORBITANALYSIS Anna BoehleA. M. GhezR. Schödel2016 год

AN IMPROVED DISTANCE AND MASS ESTIMATE FOR SGR A* FROM A MULTISTAR ORBIT ANALYSIS
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Аннотация: 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 two 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 years) 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 ($M_{bh}$) and distance ($R_o$) of Sgr A*: $M_{bh} = 4.02\pm0.16\pm0.04\times10^6~M_{\odot}$ and $7.86\pm0.14\pm0.04$ kpc. The uncertainties in $M_{bh}$ and $R_o$ 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 $\sim$2.5 compared to previous results from stellar orbits. This analysis also limits the extended dark mass within 0.01 pc to less than $0.13\times10^{6}~M_{\odot}$ at 99.7% confidence, a factor of 3 lower compared to prior work.
Год издания: 2016
Авторы: Anna Boehle, A. M. Ghez, R. Schödel, L. Meyer, S. Yelda, Saundra M. Albers, Gregory D. Martinez, E. E. Becklin, Tuan Do, Jessica R. Lu, K. Matthews, M. Morris, Breann N. Sitarski, Gunther Witzel
Издательство: IOP Publishing
Источник: The Astrophysical Journal
Ключевые слова: Astrophysical Phenomena and Observations, Adaptive optics and wavefront sensing, Heat Transfer Mechanisms
Другие ссылки: The Astrophysical Journal (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
DIGITAL.CSIC (Spanish National Research Council (CSIC)) (PDF)
DIGITAL.CSIC (Spanish National Research Council (CSIC)) (HTML)
CaltechAUTHORS (California Institute of Technology) (PDF)
CaltechAUTHORS (California Institute of Technology) (HTML)
eScholarship (California Digital Library) (PDF)
eScholarship (California Digital Library) (HTML)
DataCite API (HTML)