The neutral hydrogen distribution of irregular galaxies

Details The neutral hydrogen distribution of irregular galaxies The neutral hydrogen distribution of irregular galaxies

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...102..134h&link_type=abstract

Astronomy and Astrophysics, vol. 102, no. 1, Sept. 1981, p. 134-141. Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astronomy

95

Astronomical Maps, Galaxies, Hydrogen Clouds, Interstellar Gas, Mass Distribution, Neutral Gases, Intergalactic Media, Magellanic Clouds, Radio Astronomy, Radio Telescopes, Velocity Distribution

Scientific paper

Twenty-one relatively large irregular galaxies spread over an absolute magnitude range between -18.9 and -13.7 are mapped with the 100 m radio telescope at Effelsberg at a wavelength of 21 cm to derive global parameters, to search for extended H I envelopes, and to study the influence of the envelope on the integrated profile. A model-fit-technique is used to determine the parameters of the H I distribution, the geometry, and the rotation of the galaxies for objects smaller than 20 arcmin in angular extent. The half power width of the observed H I distribution is similar to the Holmberg diameters, and eight of the galaxies have extended H I envelopes at a low H I surface density of 10 to the 19th atoms per sq cm.

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