- Kim, Sug-Whan
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 2, n.2
- pp.101-115
- 1985
- 원문 바로보기
Using Brandt model the mess 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 following are the main results; (1) The total masses of NGC 6946 are <TEX>$3.1\times$</TEX><TEX>$10^{11}$</TEX> M(n=1) AND <TEX>$2.8\times$</TEX><TEX>$10^{11}$</TEX> 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<TEX>$\times$</TEX><TEX>$10^{10}$</TEX> M and 1.4<TEX>$\times$</TEX><TEX>$10^{11}$</TEX> M. 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<TEX>$\times$</TEX><TEX>$10^{9}$</TEX> M 4.7<TEX>$\times$</TEX><TEX>$10^9$</TEX> M and 3, 4 for both cases. Those of the disk from 1.2 kpc to 9.6 kpc are 7.6<TEX>$\times$</TEX>1<TEX>$10^{10}$</TEX>M, 1.4<TEX>$\times$</TEX><TEX>$10^{11}$</TEX>M, and 5, 8. (4) The masses of the outer halo extended to few hundreds kiloparsecs are 2.3<TEX>$\times$</TEX><TEX>$10^{11}$</TEX> M and 1.4<TEX>$\times$</TEX><TEX>$10^{11}$</TEX>M. The corresponding M/L are about 62 and 37.