Derivation of the Galactic Rotation Curve using space velocities

1996/04/23 by S. Frink, B. Fuchs, S. Roeser +1
Physics and Astronomy · #astro-ph

paper · pdf

published as A&A 314 (1996) 430 · LaTeX, 9 pages, 8 figures and l-aa.sty included, accepted for puplication in Astronomy & Astrophysics

arxiv created 1996/04/23 · arxiv updated 2009/12/01

Abstract

We present rotation curves of the Galaxy based on the space-velocities of 197 OB stars and 144 classical cepheids, respectively, which range over a galactocentric distance interval of about 6 to 12 kpc. No significant differences between these rotation curves and rotation curves based solely on radial velocities assuming circular rotation are found. We derive an angular velocity of the LSR of Omega₀ = 5.5 +/- 0.4 mas/a (OB stars) and Omega₀ = 5.4 +/- 0.5 mas/a (cepheids), which is in agreement with the IAU 1985 value of Omega₀ = 5.5 mas/a. If we correct for probable rotations of the FK5 system, the corresponding angular velocities are Omega₀ = 6.0 mas/a (OB stars) and Omega₀ = 6.2 mas/a (cepheids). These values agree better with the value of Omega₀ = 6.4 mas/a derived from the VLA measurement of the proper motion of SgrA*.

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