Universität zu Köln

Ali, Basel ORCID: 0000-0002-5728-4054, Paul, Daria, Eckart, Andreas, Parsa, Marzieh, Zajacek, Michal ORCID: 0000-0001-6450-1187, Peissker, Florian ORCID: 0000-0002-9850-2708, Subroweit, Matthias, Valencia-S, Monica, Thomkins, Lauritz and Witzel, Gunther (2020). Kinematic Structure of the Galactic Center S Cluster. Astrophys. J., 896 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We present a detailed analysis of the kinematics of 112 stars that mostly comprise the high-velocity S cluster and orbit the supermassive black hole Sgr A* at the center of the Milky Way. For 39 of them, orbital elements are known; for the remainder, we know proper motions. The distribution of the inclinations and the proper motion flight directions deviate significantly from a uniform distribution, which one expects if the orientation of the orbits are random. Across the central arcseconds, the S-cluster stars are arranged in two almost edge-on disks that are located at a position angle approximately 45 degrees with respect to the Galactic plane. The angular momentum vectors for stars in each disk point in both directions, i.e., the stars in a given disk rotate in opposite ways. The poles of this structure are located only about 25 degrees from the line of sight. This structure may be the result of a resonance process that started with the formation of the young B-dwarf stars in the cluster about 6 Myr ago. Alternatively, it indicated the presence of a disturber at a distance from the center comparable to the distance of the compact stellar association IRS 13.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ali, Basel UNSPECIFIED orcid.org/0000-0002-5728-4054 UNSPECIFIED Paul, Daria UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Parsa, Marzieh UNSPECIFIED UNSPECIFIED UNSPECIFIED Zajacek, Michal UNSPECIFIED orcid.org/0000-0001-6450-1187 UNSPECIFIED Peissker, Florian UNSPECIFIED orcid.org/0000-0002-9850-2708 UNSPECIFIED Subroweit, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Valencia-S, Monica UNSPECIFIED UNSPECIFIED UNSPECIFIED Thomkins, Lauritz UNSPECIFIED UNSPECIFIED UNSPECIFIED Witzel, Gunther UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-331487
DOI:	10.3847/1538-4357/ab93ae
Journal or Publication Title:	Astrophys. J.
Volume:	896
Number:	2
Date:	2020
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; MASSIVE BLACK-HOLE; STAR-FORMATION; MILKY-WAY; PROPER MOTIONS; STELLAR ORBITS; UNIFORMITY; POSITION; PERTURBATIONS; RESONANCE Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33148