How does the Galactic Bulge rotate?

Details How does the Galactic Bulge rotate? How does the Galactic Bulge rotate?

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..367w&link_type=abstract

In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M

Astronomy and Astrophysics

Astrophysics

1

Oh/Ir Stars, Agb Stars, Rotation, Galactic Bulge, Kinematics

Scientific paper

The bulge of our Galaxy can be studied, unaffected by interstellar absorption, using maser amplified radio lines from the envelopes of AGB stars. A large number of such stars showing OH, H2O and SiO emission is now known in the Galactic Bulge. The positions and line-of-sight velocities of these stars have been measured with high precision. In the present work, which in on-going, I analyse a sample of AGB stars with OH maser emission (OH/IR stars) taken from several surveys. I demonstrate strong evidence for a differential rotation of the Bulge with a mean rotational velocity which is more or less constant and independent of galactocentric distance.

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