M94 Group

M94 Group
Observation data (Epoch J2000)
Constellation(s)	Canes Venatici & Coma Berenices
Right ascension	[1][2]
Declination	[1][2]
Number of galaxies	16-24[3][1][2]
Brightest member	M94,[2] M106,[1]
Other designations
NGC 4736 Group,[4] Canes Venatici I Group,[4] Canes Venatici Cloud,[4] LGG 291,[1] NOGG H 617,[2] NOGG P1 636,[2] NOGG P2 647[2]
See also: Galaxy groups and clusters, List of galaxy clusters
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The M94 Group (Canes Venatici I Group) is a loose, extended group of galaxies located about 13 million light-years away^[5] in the constellations Canes Venatici and Coma Berenices. The group is one of many groups that lies within the Virgo Supercluster (i.e. the Local Supercluster)^[6] and one of the closest groups to our own Local Group.

Although the galaxies in this cluster appear to be from a single large cloud-like structure, many of the galaxies within the group are only weakly gravitationally bound, and some have not yet formed stable orbits around the center of this group. Instead, most of the galaxies in this group appear to be moving with the expansion of the universe^[7][5].

Members

The table below lists galaxies that have been consistently identified as group members in the Nearby Galaxies Catalog^[3], the Lyons Groups of Galaxies (LGG) Catalog^[1], and the three group lists created from the Nearby Optical Galaxy sample of Giuricin et al.^[2].

Members of the M94 Group

Name	Type[8]	R.A. (J2000)[8]	Dec. (J2000)[8]	Redshift (km/s)[8]	Apparent Magnitude[8]
IC 3687	IAB(s)m	12h 42m 15.1s	+38° 30′ 12″	354 ± 1	13.7
IC 4182	SA(s)m	13h 05m 49.5s	+37° 36′ 18″	321 ± 1	13.0
M94	(R)SA(r)ab	12h 50m 53.0s	+41° 07′ 14″	308 ± 1	9.0
NGC 4144	SAB(s)cd	12h 09m 58.6s	+46° 27′ 26″	265 ± 1	12.1
NGC 4190	Im pec	12h 13m 44.8s	+36° 38′ 03″	228 ± 1	13.4
NGC 4214	IAB(s)m	12h 15m 39.2s	+36° 19′ 37″	291 ± 3	10.2
NGC 4244	SA(s)cd	12h 17m 29.6s	+37° 48′ 26″	244 ± 0	10.9
NGC 4395	SA(s)m	12h 25m 48.9s	+33° 32′ 48″	319 ± 1	10.6
NGC 4449	IBm	12h 28m 11.9s	+44° 05′ 40″	207 ± 4	10.0
UGC 6817	Im	11h 50m 53.0s	+38° 52′ 49″	242 ± 1	13.4
UGC 7559	IBm	12h 27m 05.2s	+37° 08′ 33″	218 ± 5	14.2
UGC 7577	Im	12h 27m 40.9s	+43° 29′ 44″	195 ± 0	12.8
UGC 7698	Im	12h 32m 54.4s	+31° 32′ 28″	331 ± 1	13.0
UGC 8320	IBm	13h 14m 27.9s	+45° 55′ 09″	192 ± 1	12.7

Additionally, NGC 4105 and UGC 8331 are frequently but not consistently identified as members of this group in the references cited above.

The brightest member in this galaxy group is questionable and partly depends on the analysis used to determine group members. The LGG Catalog identifies M106 as part of this group, which would make it the brightest galaxy within the group.^[1] However, the other catalogs cited above do not identify M106 as a group member, in which case M94 would be the brightest galaxy within the group^[3][2].

Canes Venatici Cloud

This galaxy group is sometimes erroneously called the Canes Venatici Cloud, a larger structure of which it is a member. A galaxy cloud is a supercluster substructure. The CVn Cloud used in this manner is identified by Tully and de Vaucoleurs.

See also

• M96 Group - another group of galaxies that is similar in size to this one
• Sculptor Group - another nearby group of galaxies that is also weakly gravitationally bound
• Canes II Group (CVn II Group)
• Canes Venatici Cloud

References

1. ^ ^{a b c d e f g} A. Garcia (1993). "General study of group membership. II - Determination of nearby groups". Astronomy and Astrophysics Supplement 100: 47–90. Bibcode 1993A&AS..100...47G. 
2. ^ ^{a b c d e f g h i} G. Giuricin, C. Marinoni, L. Ceriani, A. Pisani (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups". Astrophysical Journal 543 (1): 178–194. arXiv:astro-ph/0001140. Bibcode 2000ApJ...543..178G. doi:10.1086/317070. 
3. ^ ^{a b c} R. B. Tully (1988). Nearby Galaxies Catalog. Cambridge: Cambridge University Press. ISBN 0-521-35299-1. 
4. ^ ^{a b c} "SIMBAD Astronomical Database". Results for NGC 4736 Group. http://simbad.u-strasbg.fr/Simbad/. Retrieved 2006-10-30. 
5. ^ ^{a b} I. D. Karachentsev (2005). "The Local Group and Other Neighboring Galaxy Groups". Astronomical Journal 129 (1): 178–188. arXiv:astro-ph/0410065. Bibcode 2005AJ....129..178K. doi:10.1086/426368. 
6. ^ R. B. Tully (1982). "The Local Supercluster". Astrophysical Journal 257: 389–422. Bibcode 1982ApJ...257..389T. doi:10.1086/159999. 
7. ^ I. D. Karachentsev, M. E. Sharina, A. E. Dolphin, E. K. Grebel, D. Geisler, P. Guhathakurta, P. W. Hodge, V. E. Karachentseva, A. Sarajedini, P. Seitzer (2003). "Galaxy flow in the Canes Venatici I cloud". Astronomy and Astrophysics 398 (2): 467–477. arXiv:astro-ph/0210414. Bibcode 2003A&A...398..467K. doi:10.1051/0004-6361:20021598. 
8. ^ ^{a b c d e} "NASA/IPAC Extragalactic Database". Results for various galaxies. http://nedwww.ipac.caltech.edu/. Retrieved 2006-11-06.