Universität zu Köln

Parsa, M., Eckart, A., Shahzamanian, B., Karas, V., Zajacek, M., Zensus, J. A. and Straubmeier, C. (2017). Investigating the Relativistic Motion of the Stars Near the Supermassive Black Hole in the Galactic Center. Astrophys. J., 845 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

The S-star cluster in the Galactic center allows us to study the physics close to a supermassive black hole, including distinctive dynamical tests of general relativity. Our best estimates for the mass of and the distance to Sgr A* using the three stars with the shortest period (S2, S38, and S55/S0-102) and Newtonian models are M-BH. = (4.15 +/- 0.13 +/- 0.57). x. 10(6) M-circle dot and R-0 - 8.19 +/- 0.11 +/- 0.34 kpc. Additionally, we aim at a new and practical method to investigate the relativistic orbits of stars in the gravitational field near Sgr A(*). We use a first-order postNewtonian approximation to calculate the stellar orbits with a broad range of periapse distance r(p) We present a method that employs the changes in orbital elements derived from elliptical fits to different sections of the orbit. These changes are correlated with the relativistic parameter defined as (sic) = r(s)/r(p) (with r(s) being the Schwarzschild radius) and can be used to derive.. from observational data. For S2 we find a value of (sic) =0.00088 +/- 0.00080, which is consistent, within the uncertainty, with the expected value of (sic) =0.00065 derived from MBH and the orbit of S2. We argue that the derived quantity is unlikely to be dominated by perturbing influences such as noise on the derived stellar positions, field rotation, and drifts in black hole mass.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Parsa, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shahzamanian, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Karas, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zajacek, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zensus, J. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Straubmeier, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-221838
DOI:	10.3847/1538-4357/aa7bf0
Journal or Publication Title:	Astrophys. J.
Volume:	845
Number:	1
Date:	2017
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SAGITTARIUS-A-ASTERISK; MONITORING STELLAR ORBITS; PROPER MOTIONS; SIO MASERS; MILKY; POSITION; MASS; DYNAMICS; DISTANCE; BULGE Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22183