# A Parallax Distance to the Microquasar GRS 1915+105 and a Revised Estimate of its Black Hole Mass

@article{Reid2014APD,
title={A Parallax Distance to the Microquasar GRS 1915+105 and a Revised Estimate of its Black Hole Mass},
author={Mark J. Reid and Jeffrey E. McClintock and James F. Steiner and D Steeghs and Ronald A. Remillard and Vivek Dhawan and Ramesh Narayan},
journal={arXiv: Astrophysics of Galaxies},
year={2014}
}
• Published 8 September 2014
• Physics
• arXiv: Astrophysics of Galaxies
Using the Very Long Baseline Array, we have measured a trigonometric parallax for the micro quasar GRS 1915+105, which contains a black hole and a K-giant companion. This yields a direct distance estimate of 8.6 (+2.0,-1.6) kpc and a revised estimate for the mass of the black hole of 12.4 (+2.0,-1.8) Msun. GRS 1915+105 is at about the same distance as some HII regions and water masers associated with high-mass star formation in the Sagittarius spiral arm of the Galaxy. The absolute proper…
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