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The structure and evolution of Hoag's object
Schweizer, Francois; Ford, W. Kent, Jr.; Jedrzejewski, Robert; Giovanelli, Riccardo
AA(Carnegie Institution of Washington, Washington, DC), AB(Carnegie Institution of Washington, Washington, DC), AC(Mount Wilson and Las Campanas Observatoires, Pasadena, CA), AD(Arecibo Observatory, PR)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 15, 1987, p. 454-463. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Astronomical Photometry, Astronomical Spectroscopy, Disk Galaxies, Galactic Evolution, Galactic Structure, Brightness, Centimeter Waves, Kinematics, Optical Emission Spectroscopy, Radial Velocity
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The authors present new imaging, photometric, and spectroscopic observations of Hoag's object, a 16th magnitude galaxy consisting of an almostly perfectly round core surrounded by a faint, apparently detached ring. The core of this distant system appears to be a normal spheroid with a half-light radius of 3.6 kpc, and an apparent rotation at r = 2.5 kpc of Vrotsin i = 18 km s-1. The ring is of comparable luminosity, has a mean radius of 23 kpc, is inclined about 19°±5° to the plane of the sky, and shows knotty structure and gaseous emission lines indicative of young stars. The ring rotates with Vmax= 300(+100,-60) km s-1. The authors rule out several earlier hypotheses on the origin of the ring and propose the new hypothesis that Hoag's object owes its structure to a major accretion event at least 2-3 Gyr ago.

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