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KDG 218, a Nearby Ultra-Diffuse Galaxy
KARACHENTSEV, I. D. - Personal Name
We present properties of the low-surface-brightness galaxy KDG 218 observed with the
HST/ACS. The galaxy has a half-light (effective) diameter of a e = 47 and a central surface brightness
. 4/
. The galaxy remains unresolved with the HST/ACS, which implies its distance
of SB V (0) = 24 m
of D > 13.1 Mpc and linear effective diameter of A e > 3.0 kpc. We notice that KDG 218 is most likely
associated with a galaxy group around the massive lenticular NGC 4958 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: D = 5.1 Mpc, A e = 4.8 kpc, and SB B (e) = 27 m
. 4/
. 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.
HST/ACS. The galaxy has a half-light (effective) diameter of a e = 47 and a central surface brightness
. 4/
. The galaxy remains unresolved with the HST/ACS, which implies its distance
of SB V (0) = 24 m
of D > 13.1 Mpc and linear effective diameter of A e > 3.0 kpc. We notice that KDG 218 is most likely
associated with a galaxy group around the massive lenticular NGC 4958 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: D = 5.1 Mpc, A e = 4.8 kpc, and SB B (e) = 27 m
. 4/
. 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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I. D. Karachentsev 1...[et al]
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