Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232l..11t&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 232, Aug. 15, 1979, L11-L16. Research supported by the Research Corp
Astronomy and Astrophysics
Astronomy
30
Astronomical Photography, Galactic Radiation, Galactic Structure, Hydrogen Clouds, Local Group (Astronomy), Radio Sources (Astronomy), Hydrogen Atoms, Luminous Intensity, Radial Velocity, Sky Surveys (Astronomy), Stellar Motions, Telescopes, Velocity Measurement
Scientific paper
H I measurements of a new dwarf galaxy in the Local Group, LGS 3, are reported. LGS 3 has a heliocentric velocity of -280 km/s and is resolved into stars on the Palomar Sky Survey prints. It is probably a satellite of M33. In that case, the absolute photographic magnitude of LGS 3 is about -9.0, making it one of the faintest irregular galaxies known. Its hydrogen mass is only 200,000 solar masses, one of the smallest reported for a galaxy. Other optical and H I properties are discussed. Of the five low-surface-brightness galaxies reported by Kowal, Lo, and Sargent (1978), only one other galaxy, LGS 1, was detected with a heliocentric velocity of 3695 km/s. Its absolute photographic magnitude is -17.1, and thus LGS 1 is not a bona fide dwarf galaxy despite its very low surface brightness. H I upper limits are presented for the other LGS galaxies and two dwarf spheroidal companions of M31. The implications of these limits are discussed.
Martin E. G.
Thuan Trinh Xuan
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