The H I content of the Local Group dwarf (spheroidal or irregular?) galaxy PHOENIX

Details The H I content of the Local Group dwarf (spheroidal or irregular?) galaxy PHOENIX The H I content of the Local Group dwarf (spheroidal or irregular?) galaxy PHOENIX

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381l..13c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 381, Nov. 1, 1991, p. L13-L16. Research supported by NSERC and Mi

Astronomy and Astrophysics

Astronomy

40

Dwarf Galaxies, Galactic Evolution, Galactic Structure, Irregular Galaxies, Local Group (Astronomy), Charge Coupled Devices, Emission Spectra, Hydrogen, Neutral Gases, Star Formation

Scientific paper

Neutral hydrogen was detected in the Local Group dwarf galaxy Phoenix. The 21-cm H-I-line emission, observed at a heliocentric radial velocity of 56 km/s, is clearly separated from a much larger scale component at about 140 km/s which was previously associated with the Magellanic Stream. The profile width, combined with the high inclination of the system, suggests that not much rotation is present in this system which would then be mainly supported by turbulent motions. Using a newly determined distance estimate, the integrated profile gives a total H-I mass of approximately 1.0 x 10 exp 5 solar masses. Most of the known properties of Phoenix imply that it is intermediate between typical dwarf irregular and dwarf spheroidal galaxies. It is suggested that, in fact, the two types of galaxies may belong to the same class of objects having a different history of star formation.

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