The neutral hydrogen ring, mass-to-light ratio, and dark halo of the elliptical galaxy IC 2006

Details The neutral hydrogen ring, mass-to-light ratio, and dark halo of the elliptical galaxy IC 2006 The neutral hydrogen ring, mass-to-light ratio, and dark halo of the elliptical galaxy IC 2006

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338..770s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 770-788.

Astronomy and Astrophysics

Astrophysics

69

Astronomical Photometry, Dwarf Galaxies, Elliptical Galaxies, Mass To Light Ratios, Brightness Distribution, Dark Matter, H Lines, Ionized Gases, Luminosity, Very Large Array (Vla)

Scientific paper

Observations of the E1 galaxy IC 2006 are presented, and the imaging, photometric, and spectroscopic data are analyzed. The galaxy is found to be in every respect normal for an elliptical galaxy of its luminosity. It is surrounded by an unusually regular ring of 18.9 kps radius, containing (4.8 + or - 0.8) x 10 to the 8th solar masses of H I that rotates in the opposite sense of the stars near the center. The integrated M/L(B) within the radius of the ring indicates the presence of a halo of dark matter with about twice the mass of the luminous matter. Very weak emission lines reveal a central mass of ionized gas extending to about 5 kpc radius. This gas also rotates counter to the stars and is highly turbulent. The dwarf companion Karachentseva 22 lies at a projected distance of 3.1 ring radii and has one-third as much H I as the ring, but is unlikely to be the donor of the ring H I.

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