| M94 Group | |
|---|---|
| Observation data (Epoch J2000) | |
| Constellation(s) | Canes Venatici & Coma Berenices |
| Right ascension | |
| Declination | |
| Brightest member | M94, M106, |
| Number of galaxies | 16–24 |
| Other designations | |
| NGC 4736 Group, Canes Venatici I Group, Canes Venatici Cloud, LGG 291, NOGG H 617, NOGG P1 636, NOGG P2 647 | |
The M94 Group (Canes I Group or Canes Venatici I Group) is a loose, extended group of galaxies located about 13 million light-years away 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) and one of the closest groups to the 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.
Members
The table below lists galaxies that have been consistently identified as group members in the Nearby Galaxies Catalog, the Lyons Groups of Galaxies (LGG) Catalog, and the three group lists created from the Nearby Optical Galaxy sample of Giuricin et al.
| Name | Type | R.A. (J2000) | Dec. (J2000) | Redshift (km/s) | Apparent Magnitude |
|---|---|---|---|---|---|
| IC 3687 | IAB(s)m | 12 42 15.1 | +38° 30′ 12″ | 354 ± 1 | 13.7 |
| IC 4182 | SA(s)m | 13 05 49.5 | +37° 36′ 18″ | 321 ± 1 | 13.0 |
| M94 | (R)SA(r)ab | 12 50 53.0 | +41° 07′ 14″ | 308 ± 1 | 9.0 |
| NGC 4144 | SAB(s)cd | 12 09 58.6 | +46° 27′ 26″ | 265 ± 1 | 12.1 |
| NGC 4190 | Im pec | 12 13 44.8 | +36° 38′ 03″ | 228 ± 1 | 13.4 |
| NGC 4214 | IAB(s)m | 12 15 39.2 | +36° 19′ 37″ | 291 ± 3 | 10.2 |
| NGC 4244 | SA(s)cd | 12 17 29.6 | +37° 48′ 26″ | 244 | 10.9 |
| NGC 4395 | SA(s)m | 12 25 48.9 | +33° 32′ 48″ | 319 ± 1 | 10.6 |
| NGC 4449 | IBm | 12 28 11.9 | +44° 05′ 40″ | 207 ± 4 | 10.0 |
| UGC 6817 | Im | 11 50 53.0 | +38° 52′ 49″ | 242 ± 1 | 13.4 |
| UGC 7559 | IBm | 12 27 05.2 | +37° 08′ 33″ | 218 ± 5 | 14.2 |
| UGC 7577 | Im | 12 27 40.9 | +43° 29′ 44″ | 195 | 12.8 |
| UGC 7698 | Im | 12 32 54.4 | +31° 32′ 28″ | 331 ± 1 | 13.0 |
| UGC 8320 | IBm | 13 14 27.9 | +45° 55′ 09″ | 192 ± 1 | 12.7 |
Additionally, NGC 4105 and DDO 169 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. 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.
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
- Sculptor Group
- Canes II Group (CVn II Group)
References
- ^ 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.
- ^ 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. S2CID 9618325.
- ^ R. B. Tully (1988). Nearby Galaxies Catalog. Cambridge: Cambridge University Press. ISBN 0-521-35299-1.
- ^ "NAME CVn I Group". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-10-30.
- ^ 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. S2CID 119385141.
- R. B. Tully (1982). "The Local Supercluster". Astrophysical Journal. 257: 389–422. Bibcode:1982ApJ...257..389T. doi:10.1086/159999.
- 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. S2CID 6310283.
- ^ "NASA/IPAC Extragalactic Database". Results for various galaxies. Retrieved 2006-11-06.
External links
Media related to M94 Group at Wikimedia Commons
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