Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jass....2..101k&link_type=abstract
Journal of Astronomy and Space Science, vol. 2, no. 2, p. 101-115.
Astronomy and Astrophysics
Astronomy
Scientific paper
Using Brandt model the mass distribution of the late type spiral galaxy NGC 6946 was derived, and the total mass was reestimated to understand the M/L ratio of this galaxy. Two kinds of the rotation curve with shape parameter n = 1 and 3.3 were examined. The followings are the main results; (1) The total masses of NGC 6946 are 3.1 x 1011 M (n=1) and 2.8 x 1011 M (n=3.3) respectively, and the corresponding M/L are about 17 and 16 for both cases. (2) The optical image in the blue light, whose radius is 9.6 kpc, has 8 x 1010Msolar and 1.4 x 1011Msolar. These give the value of M/L about 5 and 8 respectively. (3) The masses and M/L of the nuclear region within 1.2 kpc are 4.0¡¿109Msolar, 4.7 x 109Msolar and 3, 4 for both cases. Those of the disk from 1.2 kpc to 9.6 kpc are 7.6 x 1010Msolar, 1.4 x 1011Msolar, and 5, 8. (4) The masses of the outer halo extended to few hundreds kiloparsecs are 2.3 x 1011Msolar and 1.4 x 1011Msolar. The corresponding M/L are about 62 and 37.
Chun Mun-Suk
Kim Sug-Whan
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