M96 Group

The M96 Group (also known as the Leo I Group) is a group of galaxies in the constellation Leo. This group contains between 8 and 24 galaxies, including three Messier objects.[3][4][5][6] The group is one of many groups that lies within the Virgo Supercluster (the combined Local Group and Virgo cluster).[7]

"Leo Group" redirects here. For the cluster of galaxies, see Leo Cluster. For the galaxy triplet, see Leo Triplet.

M96 Group
M95 (left) and M96 (right). Credit:Scott Anttila.
Observation data (Epoch J2000 [1][2])
Constellation(s)Leo [3][4]
Right ascension 10h 48m 34.7s [1]
Declination+12° 40′ 15″ [1]
Brightest memberM96[3][4]
Number of galaxies8-24[3][4][5][6]
Distance
(co-moving)		11.3 Mpc (37 Mly) [1]
Other designations
Leo I Group,[6] LGG 217,[3] NOGG H 507,[4]
NOGG P1 498,[4] NOGG P2 507[4]

Members

The table below lists galaxies that have been consistently identified as group members in the Nearby Galaxies Catalog,[5] the survey of Fouque et al.,[6] the Lyons Groups of Galaxies (LGG) Catalog,[3] and the three group lists created from the Nearby Optical Galaxy sample of Giuricin et al.[4]

Members of the M96 Group
Name Type[8][9] R.A. (J2000)[8][9] Dec. (J2000)[8][9] Redshift (km/s)[8][9] Apparent Magnitude[8][9]
M95 SB(r)b  10h 43m 57.7s +11° 42′ 14″ 778 ± 4 11.4
M96 SAB(rs)ab  10h 46m 45.7s +11° 49′ 12″ 897 ± 4 10.1
M105 E1  10h 47m 49.6s +12° 34′ 54″ 911 ± 2 10.2
NGC 3299 SAB(s)dm  10h 36m 23.8s +12° 42′ 27″ 641 ± 6 13.3
NGC 3377 E5.5  10h 47m 42.4s +13° 59′ 08″ 665 ± 2 11.2
NGC 3384 SB(s)0  10h 48m 16.9s +12° 37′ 46″ 704 ± 2 10.9
NGC 3412 SB(s)0  10h 50m 53.3s +13° 24′ 44″ 841 ± 2 11.5
NGC 3489 SAB(rs)0  11h 00m 18.6s +13° 54′ 04″ 677 ± 2 11.1
Leo Ring H I region  10h 48m 19.0s +12° 41′ 21″ 960 ± 80

Nearby groups

The Leo Triplet, which includes the spiral galaxies M65, M66, and NGC 3628,[3][4][5] is located physically near the M96 Group.[10] Some group identification algorithms actually identify the Leo Triplet at part of the M96 Group.[4][6] The two groups may actually be separate parts of a much larger group.[10]

M96 Group also includes the bright galaxies Messier 105 and Messier 95.[11]
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References
  1. "MESSIER 096 GROUP". NASA/IPAC Extragalactic Database. Retrieved 2015-11-05.
  2. "NAME M96 GROUP". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-10-24.
  3. 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.
  4. 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.
  5. R. B. Tully (1988). Nearby Galaxies Catalog. Cambridge: Cambridge University Press. ISBN 0-521-35299-1.
  6. P. Fouque; E. Gourgoulhon; P. Chamaraux; G. Paturel (1992). "Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members". Astronomy and Astrophysics Supplement. 93: 211–233. Bibcode:1992A&AS...93..211F.
  7. R. B. Tully (1982). "The Local Supercluster". Astrophysical Journal. 257: 389–422. Bibcode:1982ApJ...257..389T. doi:10.1086/159999.
  8. "NASA/IPAC Extragalactic Database". Results for various galaxies. Retrieved 2006-10-24.
  9. "SIMBAD". Retrieved 2015-10-24.
  10. L. Ferrarese; H. C. Ford; J. Huchra; R. C. Kennicutt Jr.; J. R. Mould; S. Sakai; W. L. Freedman; P. B. Stetson; B. F. Madore; B. K. Gibson; J. A. Graham; S. M. Hughes; G. D. Illingworth; D. D. Kelson; L. Macri; K. Sebo; N. A. Silbermann (2000). "A Database of Cepheid Distance Moduli and Tip of the Red Giant Branch, Globular Cluster Luminosity Function, Planetary Nebula Luminosity Function, and Surface Brightness Fluctuation Data Useful for Distance Determinations". Astrophysical Journal Supplement. 128 (2): 431–459. arXiv:astro-ph/9910501. Bibcode:2000ApJS..128..431F. doi:10.1086/313391.
  11. "A galactic maelstrom". Retrieved 31 August 2015.
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