Galactic structure from the spacelab infrared telescope. III - A dynamical model for the Milky Way bulge

Abstract

view Abstract Citations (229) References (58) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Galactic Structure from the Spacelab Infrared Telescope. III. A Dynamical Model for the Milky Way Bulge Kent, S. M. Abstract The Milky Way bulge is modeled as an oblate isotropic rotator with constant M/L ratio. A model with M/L2.2 micron = 1 successfully reproduces a variety of stellar velocity dispersion measurements for R between 2 and 1200 pc. An observed increase in the stellar velocity dispersion inside 2 pc requires either that there be an additional central mass of order 3 x 10 exp 6 solar mass or that the stellar motions become anisotropic there. The model has insufficient mass to reproduce the observed peak in the H I and CO rotation curve of 250 km/s at 300 pc; it is argued that the peak arises from noncircular gas motions and does not reflect the true mass of the bulge. Publication: The Astrophysical Journal Pub Date: March 1992 DOI: 10.1086/171070 Bibcode: 1992ApJ...387..181K Keywords: Astronomical Models; Galactic Bulge; Galactic Structure; Infrared Telescopes; Milky Way Galaxy; Spacelab Payloads; Black Holes (Astronomy); Body Kinematics; Dark Matter; Mass To Light Ratios; Astrophysics; GALAXY: KINEMATICS AND DYNAMICS full text sources ADS | data products SIMBAD (2) Related Materials (2) Part 1: 1992ApJS...78..403K Part 2: 1991ApJ...378..131K