Dynamics of disk galaxies (Invited review)

Details Dynamics of disk galaxies (Invited review) Dynamics of disk galaxies (Invited review)

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.118..337f&link_type=abstract

(IAU, Asian-Pacific Regional Meeting, 3rd, Kyoto, Japan, Sept. 30-Oct. 5, 1984) Astrophysics and Space Science (ISSN 0004-640X),

Astronomy and Astrophysics

Astrophysics

1

Disk Galaxies, Galactic Rotation, Missing Mass (Astrophysics), Coronas, Gravitational Fields, Mass Distribution, Space Density

Scientific paper

In order to detect the gravitational effect of the dark corona component of disk galaxies, it is necessary to have surface photometry and rotation data that extend well beyond three disk-scale lengths. Such data exists now for several pure disk galaxies. There is very strong evidence for dark coronas in these galaxies. It has been possible to estimate the scale length and density for their dark components, which can be well represented as isothermal spheres. The pure disk galaxies that have been studied so far have absolute magnitudes in the range -17 > MB > -19.5. It would be very interesting to know whether the fainter dwarf irregular galaxies (which are also disk systems) have dark coronas: are these coronas necessary for disk galaxies to form?

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