M51 Group

{{Short description|Galaxy cluster in constellation Canes Venatici}} {{Galaxy cluster | name = M51 Group | image = 300px |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}}<ref name="garcia1993">{{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}}</ref><ref name="giuricinetal2002">{{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 |s2cid=9618325 }}</ref> | dec = {{DEC|46|13}}<ref name="garcia1993" /><ref name="giuricinetal2002" /> | constellation = Canes Venatici | member_no = 7–17<ref name="garcia1993" /><ref name="giuricinetal2002" /><ref name="nbg" /><ref name="fouqueetal1992" /> | brightest_member = Whirlpool Galaxy (M51A)<ref name="garcia1993" /><ref name="giuricinetal2002" /><ref name="fouqueetal1992" /> | other_names = NGC 5194 Group, LGG 347,<ref name="garcia1993" /> NOGG H 712,<ref name="giuricinetal2002" /><br />NOGG P1 723,<ref name="giuricinetal2002" /> NOGG P2 739<ref name="giuricinetal2002" /> }}

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).<ref name="garcia1993" /><ref name="giuricinetal2002" /><ref name="nbg">{{cite book | author=R. B. Tully | date=1988 | title=Nearby Galaxies Catalog | edition= | publisher=Cambridge University Press | location=Cambridge | isbn=0-521-35299-1}}</ref><ref name="fouqueetal1992">{{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}}</ref>

==Members== The table below lists galaxies that have been consistently identified as group members in the Nearby Galaxies Catalog,<ref name="nbg" /> the survey of Fouque et al.,<ref name="fouqueetal1992" /> the Lyons Groups of Galaxies (LGG) Catalog,<ref name="garcia1993" /> and the three group lists created from the Nearby Optical Galaxy sample of Giuricin et al.<ref name="giuricinetal2002" />

{| class="wikitable" style="text-align:center;" |+'''Members of the M51 Group''' |- ! Name ! Type<ref name="ned">{{cite web | title=NASA/IPAC Extragalactic Database | work=Results for various galaxies | url=http://nedwww.ipac.caltech.edu/ | accessdate=2006-10-19}}</ref> ! R.A. (J2000)<ref name="ned" /> ! Dec. (J2000)<ref name="ned" /> ! Redshift (km/s)<ref name="ned" /> ! Apparent Magnitude<ref name="ned" /> |- | Whirlpool Galaxy (M51A) | SA(s)bc pec | {{RA|13|29|52.7}} | {{DEC|+47|11|43}} | 463 ± 3 | 9.0 |- | M51B (NGC 5195) | SB0 pec | {{RA|13|29|59.6}} | {{DEC|+47|15|58}} | 465 ± 10 | 10.5 |- | NGC 5023 | Scd | {{RA|13|12|12.6}} | {{DEC|+44|02|28}} | 407 ± 1 | 12.9 |- | NGC 5229 | SB(s)d | {{RA|13|34|02.8}} | {{DEC|+47|54|56}} | 364 ± 8 | 14.3 |- | Sunflower Galaxy (M63) | SA(rs)bc | {{RA|13|15|49.3}} | {{DEC|+42|01|45}} | 504 ± 4 | 9.3 |- | UGC 8313 | SB(s)c | {{RA|13|13|53.9}} | {{DEC|+42|12|31}} | 593 ± 4 | 14.4 |- | UGC 8331 | IAm | {{RA|13|15|30.3}} | {{DEC|+47|29|56}} | 260 ± 5 | 14.6 |- |}

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 Groups== The M51 Group is located to the southeast of the M101 Group and the NGC 5866 Group.<ref name="ferrareseetal00">{{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 | s2cid=121612286 }}</ref> 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.<ref name="ferrareseetal00" /> However, most group identification methods (including those used by the references cited above) identify these three groups as separate entities.

==See also== * Virgo Supercluster

==References== {{Reflist}}

==External links== {{commonscat}} * [http://messier.seds.org/more/m051gr.html M51 group, SEDS Messier pages]

{{DEFAULTSORT:M51 Group}} Category:M51 Group Category:Canes Venatici