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

页码：293 / 299

页数：7

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