Late-type galaxies with extended envelopes of neutral hydrogen

Details Late-type galaxies with extended envelopes of neutral hydrogen Late-type galaxies with extended envelopes of neutral hydrogen

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....91..341h&link_type=abstract

Astronomy and Astrophysics, vol. 91, no. 3, Nov. 1980, p. 341-351. Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astrophysics

37

Astrophysics, Galaxies, Hydrogen Clouds, Neutral Gases, Magellanic Clouds, Velocity Distribution

Scientific paper

Extended H I-envelopes are found in three hydrogen-rich galaxies or systems of galaxies of late type: NGC 3109 and the pairs NGC 4490/4485 and NGC 4618/4625. Their H I-extent at a level of 10 to the 19th atoms/sq cm is between three and eight times the optical D(25) diameter. All three galaxies are comparable in size to Magellanic type galaxies, showing deformation-like warps in their H I distribution. NHC 4490 and NGC 4618 are galaxy pairs in the 4631-group of galaxies while NGC 3109 is an isolated field galaxy. Virial calculation of the NGC 4631 galaxies reveal a significant difference between the virial mass and the sum of the luminous masses of the twelve brightest member galaxies.

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