Dwarf Spheroidal Galaxies in the M101 Group and Behind it

被引：7
|
作者：
Karachentsev, I. D. [1 ]
Makarova, L. N. [1 ]
机构：
[1] Russian Acad Sci, Special Astrophys Observ, Moscow, Russia
来源：
ASTROPHYSICS | 2019年 / 62卷 / 03期
关键词：
galaxies; dwarf galaxies; GIANT BRANCH DISTANCES; TIP;
D O I：
10.1007/s10511-019-09582-7
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We use images from the Hubble Space Telescope to determine the distances to a dozen objects with low surface brightness recently observed around the bright nearby spiral M101. Only two dwarf galaxies, M101-DwA and M101-Dw9, turn out to be actual satellites of M101 at distances of about 7 Mpc. The other objects are probably members of a distant group around the S0-galaxies NGC5485/5473. Based on the radial velocities and projected separations of the 9 satellites, we obtain an estimate of (8.5 +/- 3.0) 10(11)M(circle dot) for the total mass of M101, which is consistent with a ratio 16 +/- 6 for the total mass to the stellar mass of the galaxy.
引用
收藏
页码：293 / 299
页数：7
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