| 词条 | NGC 4631 Group |
| 释义 |
| name = NGC 4631 Group | epoch=J2000 | ra=12h 09m[1][2] | dec=+30° 02′[1][2] | constellation = Canes Venatici & Coma Berenices | member_no = 5-27[1][2][7][8] | brightest_member = NGC 4631[2][8] | other_names = LGG 291,[1] NOGG H611,[2] NOGG P1 631,[2] NOGG P2 642[2]}} The NGC 4631 Group is a poorly defined group of galaxies, about 25 million light years from Earth in the Coma Berenices and Canes Venatici constellations. The NGC 4631 Group is one of many that lie within the Virgo Supercluster.[8] Members
Aside from these four galaxies, however, the determination of group membership is quite variable. The group lies in a relatively crowded part of the sky near the Virgo Cluster, so exact determination of the group membership is extremely difficult. Some studies have estimated that the NGC 4631 Group contains as few as 5 galaxies,[5] while others place the estimate as high as 27.[2] Additionally, it is unclear as to whether the galaxies near NGC 4631 and NGC 4656/NGC4657 form one large group or two smaller groups.[1] See also
References1. ^1 2 3 4 {{cite journal | author=A. M. 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 {{cite journal | author=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 3 {{cite journal | author=P. Fouque | author2=E. Gourgoulhon | author3=P. Chamaraux | author4=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}} 4. ^{{cite journal | author=H. Arp | title=Atlas of Peculiar Galaxies | journal=Astrophysical Journal Supplement | date=1966 | volume=14 | pages=1–20 | bibcode=1966ApJS...14....1A | doi=10.1086/190147}} 5. ^1 {{cite book | author=R. B. Tully | date=1988 | title=Nearby Galaxies Catalog | edition= | publisher=Cambridge University Press | location=Cambridge | isbn=0-521-35299-1}} External links
5 : Galaxy clusters|NGC 4631 Group|Coma Berenices (constellation)|Canes Venatici|Virgo Supercluster |
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