Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993acasn..34..131p&link_type=abstract
Acta Astronomica Sinica (ISSN 0001-5245), vol. 34, no. 2, p. 139-147
Astronomy and Astrophysics
Astronomy
2
Astronomical Models, Disk Galaxies, Galactic Mass, Three Dimensional Models, Asymptotic Properties, Density Distribution, Galactic Rotation, Gravitational Effects, Mathematical Models
Scientific paper
Asympotic behavior of a galactic disk in its central region with rigid rotation is discussed theoretically, and combining the asymtotic solution in the outer region of the disk where the rotation curve is flat, a probably reasonable model, sigma(r) = sigma(0)(1-4/5 br + r2/a2-5/4 exp(-br), where sigma(r) is projective surface density of the disk, over the whole galaxy is suggested, by using a method similar to that in a previous paper and taking into account important gravitational contribution of the bulge of the galaxy. Besides, an important relation among some physical parameters and masses of both disk and bulge of the galaxy is found.
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