SIMBAD references

2020ApJ...896..100A - Astrophys. J., 896, 100-100 (2020/June-3)

Kinematic structure of the Galactic Center S cluster.

ALI B., PAUL D., ECKART A., PARSA M., ZAJACEK M., PEISSKER F., SUBROWEIT M., VALENCIA-S M., THOMKINS L. and WITZEL G.

Abstract (from CDS):

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° 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° 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.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galactic center - Black Holes - Star clusters - Stellar dynamics

Status at CDS:   Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 14

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2020.08.13-01:53:29

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