Coma I


The Coma I Group is a group of galaxies located about away in the constellation Coma Berenices. The brightest member of the group is NGC 4725. The Coma I Group is rich in spiral galaxies while containing few elliptical and lenticular galaxies. Coma I lies in the foreground of the more distant Coma and Leo clusters and is located within the Virgo Supercluster.
The Coma I Group is currently infalling into the Virgo Cluster and will eventually merge with it.

Structure

The Coma I Group appears to consist of two main subgroups, a denser subgroup centered on NGC 4274 and NGC 4278, and looser one surrounding NGC 4565 as suggested by De Vaucouleurs. However, Gregory and Thompson found no clear evidence for two distinct subgroups in Coma I. They noted a slight density enhancement around NGC 4274 with the rest of the members of Coma I uniformly distributed to the southeast of this density enhancement. They also noted a central barlike structure with a minor axis of and a major axis of. P.Fouque et al. and A. M. Garcia et al. both list the Coma I group consisting of two subgroups centered on NGC 4274 and NGC 4565. Additionally, Gibson et al. suggests that another association, the Coma II Group centered on NGC 4725 is associated with the Coma I Group.

Members

The table below lists galaxies that have been commonly and consistently identified as group members in the Nearby Galaxies Catalog, the survey of Fouque et al., the Lyons Groups of Galaxies Catalog, and the three group lists created from the Nearby Optical Galaxy sample of Giuricin et al.
NameTypeR.A. Dec. Redshift Apparent Magnitude
NGC 4020SBd?76013.1
NGC 4062SAc75812.5
NGC 4136SABc60911.69
NGC 4173SBd112713.59
NGC 4203SAB0^-?108611.8
NGC 4245SB0/a?88412.31
NGC 4251SB0?106611.58
NGC 4274SBab93011.34
NGC 4278E1-262011.20
NGC 4283E0105613.10
NGC 4310 SAB0^+?91313.22
NGC 4314SBa96311.43
NGC 4359SBc?125313.6
NGC 4393SABd75512.7
NGC 4414SAc?71610.96
NGC 4448SBab66112.00
NGC 4494E1-2134210.71
NGC 4525Scd?117213.4
NGC 4559SABcd80710.46
NGC 4562SBdm?135313.9
NGC 4565SAb?123010.42
NGC 4725SABab pec120610.11
NGC 4747SBcd? pec119012.96

Other possible member galaxies include IC 3215, IC 3247, MCG 5-29- 66, NGC 4080, NGC 4150, NGC 4308, NGC 4455, NGC 4509, NGC 4534, NGC 4627, NGC 4631, NGC 4656, NGC 4670, UGC 6900, UGC 7007, UGC 7300, UGC 7428, UGC 7438, UGC 7673, UGC 7916 and UGCA 294.

Nearby groups

The center of the Virgo Cluster lies about from the Coma I Group.