Do Maser Stars Trace a Rotating Galactic Bar?

Details Do Maser Stars Trace a Rotating Galactic Bar? Do Maser Stars Trace a Rotating Galactic Bar?

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..374..187h&link_type=abstract

From Stars to Galaxies: Building the Pieces to Build Up the Universe. ASP Conference Series, Vol. 374, proceedings of the confer

Computer Science

Scientific paper

I have analyzed the radial velocities in two large samples of maser stars that cover most of the galactic plane. I compare a diagram of longitude versus radial velocity as observed with a diagram obtained from the calculation of orbits in a simple, but realistic galactic potential. Almost all stars belong to the galactic disk, but there is a small sample with high velocities close to the galactic centre and in the so--called forbidden quadrants; these velocities cannot be explained by a combination of galactic rotation and a modest dispersion in velocity. An acceptable explanation is one in which the stars of this small sample move up and down a rotating galactic bar.

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