CO along the minor axis of M31

Details CO along the minor axis of M31 CO along the minor axis of M31

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...218...39s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 218, no. 1-2, July 1989, p. 39-44.

Astronomy and Astrophysics

Astrophysics

15

Andromeda Galaxy, Carbon Monoxide, Spiral Galaxies, Astronomical Maps, Molecular Spectra, Radio Spectra, Shock Waves

Scientific paper

Emission in the CO J = 1-0 transition has been mapped along the northwest minor axis of M31 with a resolution of 33 arcsec and a spacing of 15 arcsec in a region near the dominant arm '4'. Two major components have been found: an arm component with a typical integrated CO line intensity of 10 K km/s, and an outer warp component at the systemic velocity with an integrated intensity of 1 K km/s. The CO arm component partakes in the expansion seen in the Westerbork H I observations and shows a velocity gradient of 0.030 km/s pc across the arms, with the outer part of the arm expanding fastest, its expansion velocity being about 40 km/s. The maximum CO is concentrated near the outer edge of the H I arm, outside the region of maximum H I emission. These effects may be interpreted in terms of shocks induced by galactic density waves, if arm 4 lies outside the corotation region in M31.

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