Oval distortions in the center of spiral galaxies - CO observations of NGC 6946 and Maffei 2

Details Oval distortions in the center of spiral galaxies - CO observations of NGC 6946 and Maffei 2 Oval distortions in the center of spiral galaxies - CO observations of NGC 6946 and Maffei 2

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...199...29w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 199, no. 1-2, June 1988, p. 29-40.

Astronomy and Astrophysics

Astrophysics

58

Astronomical Maps, Molecular Gases, Radio Telescopes, Spiral Galaxies, Stellar Evolution, Barred Galaxies, Carbon Monoxide, Very Large Array (Vla)

Scientific paper

The authors report high-resolution 12CO(1-0) mapping of the central parts of two late-type spiral galaxies, NGC 6946 and Maffei 2, made with the IRAM 30 m telescope (beamsize = 23arcsec). These maps reveal the presence in both galaxies of a central component unseen with smaller telescopes; this component is marginally resolved and has a size <600 pc; its H2 mass is around 2×108M_sun;. In NGC 6946, the authors find a molecular bar quite similar to that found with the interferometer, but definitely wider: its extent, measured at half-maximum, is 910×370 pc; its total extent is around 1250×560 pc. In Maffei 2, the velocity field in the center shows a misalignment with the optical major axis, suggesting the presence of a bar in this galaxy, too. The authors demonstrate the presence of oval distortions of the gravitational potential in the center of both galaxies. These oval distortions of the potential could trigger the star forming activity in the nuclei of NGC 6946 and Maffei 2.

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