Radio continuum and H I observations of the interacting galaxies NGC 4490/85

Details Radio continuum and H I observations of the interacting galaxies NGC 4490/85 Radio continuum and H I observations of the interacting galaxies NGC 4490/85

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....82..207v&link_type=abstract

Astronomy and Astrophysics, vol. 82, no. 1-2, Feb. 1980, p. 207-220.

Astronomy and Astrophysics

Astronomy

37

Continuous Spectra, Galactic Structure, Hydrogen, Interacting Galaxies, Radio Galaxies, Radio Spectra, Astronomical Maps, Continuous Radiation, Data Processing, Galactic Radiation, H Ii Regions, Neutral Gases, Radio Astronomy

Scientific paper

Westerbork Synthesis Radio Telescope observations of neutral hydrogen and continuum emission at 21 and 6 cm from the interacting system of galaxies NGC 4490/85 are presented. Observations reveal an extended H I distribution compared to the light distribution, with a ridge of H II extending from NGC 4490 towards NGC 4485 and corresponding to a chain of giant H II regions. Neutral hydrogen distributions and the radial velocities indicate that NGC 4490 has a warped H I disk. It is found that many of the features of the H I and H II distributions and kinematics can be explained by a gravitational encounter model, and the presence of a nonthermal source close to the optical center of NGC 4490 is confirmed. Thermal radio emission observed at 6 cm from nine giant H II complexes indicates a very high rate of star formation per unit mass, and the model of Larson and Tinsley (1978) of a recent burst of star formation is shown to provide an attractive alternative to the young galaxy hypothesis for NGC 4490/85.

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