期刊
ASTROPHYSICAL BULLETIN
卷 72, 期 4, 页码 376-383出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1990341317040022
关键词
galaxies: individual: KDG218
资金
- Russian Science Foundation [14-12-00965-P]
- NASA/ESA Hubble Space Telescope, program [GO-14636]
- Association of Universities for Research in Astronomy, Inc. under NASA [NAS 5-26555]
- Russian Science Foundation [17-12-00046] Funding Source: Russian Science Foundation
We present properties of the low-surface-brightness galaxy KDG218 observed with the HST/ACS. The galaxy has a half-light (effective) diameter of a (e) = 47aEuro(3) and a central surface brightness of SB (V) (0) = 24.(m)4/a-aEuro(3). The galaxy remains unresolved with the HST/ACS, which implies its distance of D > 13.1 Mpc and linear effective diameter of A (e) > 3.0 kpc. We notice that KDG218 is most likely associated with a galaxy group around the massive lenticular NGC4958 galaxy at approximately 22 Mpc, or with the Virgo Southern Extension filament at approximately 16.5 Mpc. At these distances, the galaxy is classified as an ultra-diffuse galaxy (UDG) similar to those found in the Virgo, Fornax, and Coma clusters. We also present a sample of 15 UDG candidates in the Local Volume. These sample galaxies have the following mean parameters: aOE (c) D > = 5.1 Mpc, aOE (c) A (e) > = 4.8 kpc, and aOE (c) SB (B) (e)> = 27.(m)4/a-aEuro(3). All the local UDG candidates reside near massive galaxies located in the regions with the mean stellar mass density (within 1 Mpc) about 50 times greater than the average cosmic density. The local fraction of UDGs does not exceed 1.5% of the Local Volume population. We notice that the presented sample of local UDGs is a heterogeneous one containing irregular, transition, and tidal types, as well as objects consisting of an old stellar population.
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