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]

M96 Group
M95 (left) and M96 (right). Credit:Scott Anttila.
Observation data (Epoch J2000 [1][2])
Constellation(s)	Leo [3][4]
Right ascension	10^h 48^m 34.7^s [1]
Declination	+12° 40′ 15″ [1]
Brightest member	M96[3][4]
Number of galaxies	8-24[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	10^h 43^m 57.7^s	+11° 42′ 14″	778 ± 4	11.4
M96	SAB(rs)ab	10^h 46^m 45.7^s	+11° 49′ 12″	897 ± 4	10.1
M105	E1	10^h 47^m 49.6^s	+12° 34′ 54″	911 ± 2	10.2
NGC 3299	SAB(s)dm	10^h 36^m 23.8^s	+12° 42′ 27″	641 ± 6	13.3
NGC 3377	E5.5	10^h 47^m 42.4^s	+13° 59′ 08″	665 ± 2	11.2
NGC 3384	SB(s)0	10^h 48^m 16.9^s	+12° 37′ 46″	704 ± 2	10.9
NGC 3412	SB(s)0	10^h 50^m 53.3^s	+13° 24′ 44″	841 ± 2	11.5
NGC 3489	SAB(rs)0	11^h 00^m 18.6^s	+13° 54′ 04″	677 ± 2	11.1
Leo Ring	H I region	10^h 48^m 19.0^s	+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]

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.

External links

• Leo I Galaxy Group