The nature of Hoag's object - The perfect ringed galaxy

Details The nature of Hoag's object - The perfect ringed galaxy The nature of Hoag's object - The perfect ringed galaxy

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...153..199b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 153, no. 1, Dec. 1985, p. 199-206. Research supported by the Israel Academy of

Astronomy and Astrophysics

Astrophysics

17

Astronomical Photometry, Galactic Structure, Lenticular Bodies, Peculiar Galaxies, Spectrophotometry, Astronomical Photography, Radio Spectra, Ring Structures, Ubv Spectra

Scientific paper

Hoag's object, a peculiar ringed galaxy, has been observed photographically, photometrically and spectroscopically in the optical part of the spectrum, and in the 21-cm radio band. The new observations, together with previously published data, indicate that the ring may have been formed a few Gyrs ago as a result of an extreme bar instability in a galactic disk. In this case, the galaxy may be lacking the massive halo which, in most instances, stabilizes galaxy disks against this instability.

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