Bar-induced gas velocities in the bulge of M31

Details Bar-induced gas velocities in the bulge of M31 Bar-induced gas velocities in the bulge of M31

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...426l..31s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 426, no. 1, p. L31-L33

Astronomy and Astrophysics

Astrophysics

34

Astronomical Models, Dynamic Models, Galactic Bulge, Galactic Nuclei, Galactic Structure, Gas Dynamics, Interstellar Gas, Kinematics, Orbit Calculation, Spiral Galaxies, Velocity Distribution, Astronomical Photometry, Astronomical Spectroscopy, Cosmic Dust, Emission Spectra, Ionized Gases, Mathematical Models

Scientific paper

Interstellar gas on closed orbits in a weak barlike potential, when viewed from an appropriate angle, will generate a velocity field similar to what is observed in the bulge of M31. Three phenomena observed in the inner kiloparsec of M31 are best explained by a central bar: (1) the tilt of the inner isophotes, (2) gas velocities in the inner kiloparsec, (3) the 'face-on spiral' pattern seen in dust and ionized gas. Models that fit the data have the near end of the bar south of the nucleus, and the long axis of the bar at an angle of about 20 deg to the projection of the line of sight onto the plane of M31.

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