Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...408.1009l&link_type=abstract
Astronomy and Astrophysics, v.408, p.1009-1014 (2003)
Astronomy and Astrophysics
Astrophysics
11
Galaxy: Center, Radio Lines: Ism
Scientific paper
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 \cite{San98} 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 H92alpha radio recombination line data of \cite{RobGos93} and \cite{RobYus+96}. The characteristic kinematic pattern of the ``Bar'' is reproduced by rotation in near-polar orbits seen edge-on at distances of 0.3-0.8 pc from Sgr A*, with larger radii seen to the east. The mass of ionized material in the Bar is ~ 27 Msun. The Bar and Eastern Arm together probably represent a single stream of gas falling on to the galactic center, crossing from east to west.
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