Canes Venatici I group

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The location of the Canes Venatici I group within the neighborhood of the local group

The Canes Venatici I group , CVn I for short , also M94 group , is a group of galaxies which, with a distance of about 13 million light years, is one of the closest collections of galaxies outside of the local group . Like the Local Group and other neighboring galaxy groups, it belongs to the Virgo Supercluster. The group is located in the sky in the constellations Hunting Dogs , named from the Latin Canes Venatici , and Hair of Berenike . The brightest member that certainly belongs to this group is the 9.0 mag bright spiral galaxy M 94 . The membership of the galaxy M 106 , which is roughly equally bright, but absolutely brighter due to the significantly greater distance, is controversial.

Investigations into the dynamics of the group indicate that the members of the group are only weakly bound to one another by gravity. This can be deduced from the fact that the radial velocities of the individual group members correspond to those to be expected for the respective distance due to the expansion of the universe . The lack of spheroid dwarf galaxies in this group also indicates the weak bond between their members.

Members

The following table lists the uniquely identified members of the group according to the Nearby Galaxies Catalog , the Lyons Groups of Galaxies Catalog (LGG), and the lists obtained from the Nearby Optical Galaxy sample by Giuricin et al. were created.

Members of the Canes Venatici I group
Surname Type α δ v r ( km / s ) m V
IC 3687 IAB (s) m 12 h 42 m 15.1 s 2383012+ 38 ° 30 ′ 12 ″ 354 ± 1 13.7
IC 4182 SA (s) w 13 h 05 m 49.5 s 2373618+ 37 ° 36 ′ 18 ″ 321 ± 1 13.0
M94 (R) SA (r) off 12 h 50 m 53.0 s 2410714+ 41 ° 07 ′ 14 ″ 308 ± 1 9.0
NGC 4144 SAB (s) cd 12 h 09 m 58.6 s 2462726+ 46 ° 27 ′ 26 ″ 265 ± 1 12.1
NGC 4190 In the pec 12 h 13 m 44.8 s 2363803+ 36 ° 38 ′ 03 ″ 228 ± 1 13.4
NGC 4214 IAB (s) m 12 h 15 m 39.2 s 2361937+ 36 ° 19 ′ 37 ″ 291 ± 3 10.2
NGC 4244 SA (s) cd 12 h 17 m 29.6 s 2374826+ 37 ° 48 ′ 26 ″ 244 ± 0 10.9
NGC 4395 SA (s) w 12 h 25 m 48.9 s 2333248+ 33 ° 32 ′ 48 ″ 319 ± 1 10.6
NGC 4449 IBm 12 h 28 m 11.9 s 2440540+ 44 ° 05 ′ 40 ″ 207 ± 4 10.0
UGC 6817 in the 11 h 50 m 53.0 s 2385249+ 38 ° 52 ′ 49 ″ 242 ± 1 13.4
UGC 7559 IBm 122705.212 h 27 m 05.2 s 2370833+ 37 ° 08 ′ 33 ″ 218 ±, 14.2
UGC 7577 in the 12 h 27 m 40.9 s 2432944+ 43 ° 29 ′ 44 ″ 195 ± 0 12.8
UGC 7698 in the 12 h 32 m 54.4 s 2313228+ 31 ° 32 ′ 28 ″ 331 ± 1 13.0
UGC 8320 IBm 13 h 14 m 27.9 s 2455509+ 45 ° 55 ′ 09 ″ 192 ± 1 12.7

In addition, NGC 4105 and UGC 8331 are sometimes counted as group members. As mentioned above, the group membership of M 106 is questionable.

See also

Individual evidence

  1. ↑ a b I.D. Karachentsev: The Local Group and Other Neighboring Galaxy Groups . In: Astronomical Journal . 129, No. 1, 2005, pp. 178-188. arxiv : astro-ph / 0410065 . bibcode : 2005AJ .... 129..178K . doi : 10.1086 / 426368 .
  2. ^ RB Tully: The Local Supercluster . In: Astrophysical Journal . 257, 1982, pp. 389-422. bibcode : 1982ApJ ... 257..389T . doi : 10.1086 / 159999 .
  3. ^ A b A. Garcia: General study of group membership. II - Determination of nearby groups . In: Astronomy and Astrophysics Supplement . 100, 1993, pp. 47-90. bibcode : 1993A & AS..100 ... 47G .
  4. ↑ a b G. Giuricin, C. Marinoni, L. Ceriani, A. Pisani: Nearby Optical Galaxies: Selection of the sample and Identification of Groups . In: Astrophysical Journal . 543, No. 1, 2000, pp. 178-194. arxiv : astro-ph / 0001140 . bibcode : 2000ApJ ... 543..178G . doi : 10.1086 / 317070 .
  5. ↑ a b R. B. Tully: Nearby Galaxies Catalog . Cambridge University Press, Cambridge 1988, ISBN 0-521-35299-1 .
  6. ↑ SIMBAD Astronomical Database . In: Results for NGC 4736 Group . Retrieved October 30, 2006.
  7. ↑ ID Karachentsev, ME Sharina, AE Dolphin, EK Grebel, D. Geisler, P. Guhathakurta, PW Hodge, VE Karachentseva, A. Sarajedini, P. Seitzer: Galaxy flow in the Canes Venatici I cloud . In: Astronomy and Astrophysics . 398, No. 2, 2003, pp. 467-477. arxiv : astro-ph / 0210414 . bibcode : 2003A & A ... 398..467K . doi : 10.1051 / 0004-6361: 20021598 .
  8. ↑ a b c d e NASA / IPAC Extragalactic Database . In: Results for various galaxies . Retrieved November 6, 2006.