Orbit crowding of molecular gas at a bar-spiral arm transition zone in M83

Details Orbit crowding of molecular gas at a bar-spiral arm transition zone in M83 Orbit crowding of molecular gas at a bar-spiral arm transition zone in M83

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381..118k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 1, 1991, p. 118-129.

Astronomy and Astrophysics

Astrophysics

59

Barred Galaxies, Massive Stars, Molecular Clouds, Star Formation, Carbon Monoxide, Disk Galaxies, Galactic Structure, H Ii Regions, Interstellar Gas, Spiral Galaxies

Scientific paper

The southwestern bar-spiral arm transition zone in M83 is been studied in CO, H-alpha, H I, red light, and the radio continuum. A massive molecular gas complex in the heart of the transition zone is composed or two principal components which have the morphology and kinematics expected from orbit crowding, where gas on highly elliptical orbits form the bar region converges with gas on more circular orbits from the spiral arm region. Three mechanisms for the origin of the orbit crowding are investigated, and it is proposed that the crowding is due primarily to density wave streaming motions caused by the bar and spiral arms. The inner CO component is partially coincident with a region of highly polarized radio continuum emission which precedes the H-alpha spiral arm by 15-25 arcsec, indicating that it lies on or just downstream from a shock front. This suggests that the bar gas approaching the transition zone is shocked and explains the ridge of dense gas seen upstream from the spiral arm.

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