6-m telescope observations of three dwarf spheroidal galaxies with very low surface brightness

被引：22

作者：

Makarov, D. I. ^{[1
,2
,3
,4
]}

Sharina, M. E. ^{[4
]}

Karachentseva, V. E. ^{[5
]}

Karachentsev, I. D. ^{[4
]}

机构：

[1] Univ Lyon 1, F-69622 Villeurbanne, France

[2] Observ Lyon, CRAL, F-69561 St Genis Laval, France

[3] CNRS, UMR 5574, F-75700 Paris, France

[4] Russian Acad Sci, Special Astrophys Observ, Nizhnii Arkhyz 369167, Karachai Cherke, Russia

[5] Natl Acad Sci Ukraine, Main Astron Observ, UA-03680 Kiev, Ukraine

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 581卷

基金：

美国国家航空航天局; 美国国家科学基金会; 俄罗斯科学基金会;

关键词：

galaxies: dwarf; galaxies: distances and redshifts; galaxies: fundamental parameters; galaxies: photometry; HUBBLE-SPACE-TELESCOPE; LOCAL GROUP; NEARBY GALAXIES; VIRGO CLUSTER; PHOTOMETRIC SYSTEMS; HI OBSERVATIONS; TRANSFORMATIONS; MASS; RESOLUTION; DISTANCES;

D O I：

10.1051/0004-6361/201526947

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Dwarf spheroidal galaxies (dSphs) are mostly investigated in the Local Group. DSphs are difficult targets for observations because of their small size and very low surface brightness. Here we measure spectroscopic and photometric parameters of three candidates for isolated dSphs, KKH65 = BTS23, KK180, and KK227, outside the Local Group. The galaxies are found to be of low metallicity and low velocity dispersion. They are among the lowest surface brightness objects in the Local Universe. According to the measured radial velocities, metallicities, and structural and photometric parameters, KKH65 and KK227 are representatives of the ultra-diffuse quenched galaxies. KKH65 and KK227 belong to the outer parts of the groups NGC 3414 and NGC 5371, respectively. KK180 is located in the Virgo cluster infall region.

引用

页数：8

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