| 词条 | M51 Group | ||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 |
| name = M51 Group | image = |caption = The Whirlpool Galaxy (M51A), the brightest member of the M51 Group, and M51B, the companion to the Whirlpool Galaxy. | epoch=J2000 | ra = {{RA|13|24}}[1][2] | dec = {{DEC|46|13}}[1][2] | constellation = Canes Venatici | member_no = 7-17[1][2][7][8] | brightest_member = Whirlpool Galaxy (M51A)[1][2][8] | other_names = NGC 5194 Group, LGG 347,[1] NOGG H 712,[2] NOGG P1 723,[2] NOGG P2 739[2] }} The M51 Group is a group of galaxies located in Canes Venatici. The group is named after the brightest galaxy in the group, the Whirlpool Galaxy (M51A). Other notable members include the companion galaxy to the Whirlpool Galaxy (M51B) and the Sunflower Galaxy (M63).[1][2][3][4] MembersThe table below lists galaxies that have been consistently identified as group members in the Nearby Galaxies Catalog,[3] the survey of Fouque et al.,[4] 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]
Other probable members (galaxies listed in two or more of the lists from the above references) include IC 4263 and UGC 8320. The exact membership is somewhat uncertain. Nearby GroupsThe M51 Group is located to the southeast of the M101 Group and the NGC 5866 Group.[6] The distances to these three groups (as determined from the distances to the individual member galaxies) are similar, which suggests that the M51 Group, the M101 Group, and the NGC 5866 Group are actually part of a large, loose, elongated structure.[6] However, most group identification methods (including those used by the references cited above) identify these three groups as separate entities. See also
External links
References1. ^1 2 3 4 5 6 {{cite journal | author=A. Garcia | title=General study of group membership. II - Determination of nearby groups | journal=Astronomy and Astrophysics Supplement | date=1993 | volume=100 | pages=47–90 | bibcode=1993A&AS..100...47G}} 2. ^1 2 3 4 5 6 7 8 {{cite journal |author1=G. Giuricin |author2=C. Marinoni |author3=L. Ceriani |author4=A. Pisani | title=Nearby Optical Galaxies: Selection of the Sample and Identification of Groups | journal=Astrophysical Journal | date=2000 | volume=543 | issue=1 | pages=178–194 | bibcode=2000ApJ...543..178G | doi=10.1086/317070|arxiv = astro-ph/0001140 }} 3. ^1 2 {{cite book | author=R. B. Tully | date=1988 | title=Nearby Galaxies Catalog | edition= | publisher=Cambridge University Press | location=Cambridge | isbn=0-521-35299-1}} 4. ^1 2 3 {{cite journal | author=P. Fouque, E. Gourgoulhon, P. Chamaraux, G. Paturel | title=Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members | journal=Astronomy and Astrophysics Supplement | date=1992 | volume=93 | pages=211–233 | bibcode=1992A&AS...93..211F | last2=Gourgoulhon | last3=Chamaraux | last4=Paturel}} 5. ^1 2 3 4 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for various galaxies | url=http://nedwww.ipac.caltech.edu/ | accessdate=2006-10-19}} 6. ^1 {{cite journal | author=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 | title=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 | journal=Astrophysical Journal Supplement | date=2000 | volume=128 | issue=2 | pages=431–459 | bibcode=2000ApJS..128..431F | doi=10.1086/313391|arxiv = astro-ph/9910501 | last4=Kennicutt }} 2 : M51 Group|Canes Venatici |
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