2003A&A...408.1009L -
Astronomy and Astrophysics, volume 408, 1009-1014 (2003/9-4)
The velocity field of ionized gas near Sgr A*.
LISZT H.S.
Abstract (from CDS):
Several distinct kinematic patterns are superposed in the ionized gas seen nearest Sgr A
*, the compact radio source at the center of the Milky Way. This has led to confusion over the morphology and motions of the gas; the recent dispersion-ring model of Sanders (
1998MNRAS.294...35S) inadvertantly elides parts of two separate features and reproduces a description of the gas flow which does not actually occur. We demonstrate the gas kinematics via an analysis of the high-resolution H92α radio recombination line data of Roberts & Goss (
1993ApJS...86..133R) and Roberts et al. (
1996ApJ...459..627R). The characteristic kinematic pattern of the ``Bar'' is reproduced by rotation in near-polar orbits seen edge-on at distances of 0.3-0.8pc from Sgr A
*, with larger radii seen to the east. The mass of ionized material in the Bar is ∼27M
☉. The Bar and Eastern Arm together probably represent a single stream of gas falling on to the galactic center, crossing from east to west.
Abstract Copyright:
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Journal keyword(s):
Galaxy: center - radio lines: ISM
Simbad objects:
1
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