Rotation of the nuclear region of M31

Details Rotation of the nuclear region of M31 Rotation of the nuclear region of M31

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221...80p&link_type=abstract

Astrophysical Journal, Part 1, vol. 221, Apr. 1, 1978, p. 80-86.

Astronomy and Astrophysics

Astrophysics

20

Andromeda Galaxy, Astronomical Models, Galactic Nuclei, Radial Velocity, Stellar Rotation, Galactic Rotation, Stellar Spectra, Velocity Measurement

Scientific paper

Measurement of the apparent rotation of the stars in the nuclear region of M31 shows that a peak velocity of approximately 60 km/s occurs at a radius of r about 1.5 arcsec or 5 pc. The velocity then falls to about 0 km/s between 3 and 6 arcsec before rising again. This form of velocity curve can be simply understood in terms of a two-component dynamical model: one component represents the nucleus, and the second represents the bulge of M31. Close to the nucleus, there is no evidence for line-of-sight mean stellar velocities along the minor axis. Neglecting the central rotation peak, the overall velocity gradient to a radius of 2 arcmin is approximately 0.5 km/s per arcsec.

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