The structure and evolution of Hoag's object

Details The structure and evolution of Hoag's object The structure and evolution of Hoag's object

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..454s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 15, 1987, p. 454-463.

Astronomy and Astrophysics

Astrophysics

30

Astronomical Photometry, Astronomical Spectroscopy, Disk Galaxies, Galactic Evolution, Galactic Structure, Brightness, Centimeter Waves, Kinematics, Optical Emission Spectroscopy, Radial Velocity

Scientific paper

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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