Slippery evidence on the Galaxy's invisible heavy halo

Details Slippery evidence on the Galaxy's invisible heavy halo Slippery evidence on the Galaxy's invisible heavy halo

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204p..87l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, Sept. 1983, p. 87P-92P.

Astronomy and Astrophysics

Astronomy

70

Carbon Stars, Dwarf Galaxies, Velocity Measurement, Angular Velocity, Halos, Radial Velocity

Scientific paper

Velocity spectra of the carbon stars in Carina, Leo I, Leo II, and the Fornax dwarf galaxy were obtained in January 1983 using spectrographs in the 4450-5350 A, 5165 A, and 5000-5900 A bands. The carbon star velocities were quantified either through comparison of the positions of the Swan bandheads on large scale plots of the spectra or with a cross-correlation scheme, which was questionable for considering carbon stars. An rms scatter of 20 km/sec was found in the angular velocity measurements of six carbon stars, while good velocity spectra were not available for the Leo I and Leo II dwarf galaxies. Mass calculations based on the velocities detected suggest that the Galaxy does not possess a heavy halo. The main mass of the Galaxy, out to a distance of 100 kpc of the center, is calculated to be within 0.8 of 2.6 x 10 to the 11th solar masses.

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