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NGC 4676, or the Mice Galaxies, are two spiral galaxies in the constellation Coma Berenices. About 290 million light-years distant,[2] they have begun the process of colliding and merging. Their name refers to the long tails produced by tidal action—the relative difference between gravitational pulls on the near and far parts of each galaxy—known here as a galactic tide. It is a possibility that both galaxies, which are members of the Coma Cluster,[3] have experienced collision, and will continue colliding until they coalesce.

NGC 4676A / 4676B
The Mice Galaxies, NGC 4676A (right) / NGC 4676B (left)
Observation data (J2000 epoch)
ConstellationComa Berenices
Right ascension12h 46m 10.1s / 12h 46m 11.2s[1]
Declination+30° 43′ 55″ / +30° 43′ 22″[1]
Redshift6613 ± 8 / 6607 ± 7 km/s[1]
Distance290 Mly (89 Mpc)[2]
Apparent magnitude (V)14.7 / 14.4[1]
Characteristics
TypeIrr / SB(s)0/a pec[1]
Size760,000 ly (233 kpc) (estimated)[lower-alpha 1]
Apparent size (V)2′.3 × 0′.7 / 2′.2 × 0′.8[1]
Notable featuresInteracting galaxies
Other designations
Mice Galaxies,[1] IC 819 / 820,[1] UGC 7938 / 7939,[1]
PGC 43062 / 43065,[1] Arp 242[1]

The colors of the galaxies are peculiar. In NGC 4676A a core with some dark markings is surrounded by a bluish white remnant of spiral arms. The tail is unusual, starting out blue and terminating in a more yellowish color, despite the fact that the beginning of each arm in virtually every spiral galaxy starts yellow and terminates in a bluish color.[clarification needed] NGC 4676B has a yellowish core and two arcs; arm remnants underneath are bluish as well.

The galaxies were photographed in 2002 by the Hubble Space Telescope.[4] In the background of the Mice Galaxies, there are at least 3,300 galaxies, at distances up to 13 billion light-years.


See also



References


  1. "NASA/IPAC Extragalactic Database". Results for NGC 4676A / 4676B. Retrieved 2006-11-21.
  2. Chien, Li-Hsin; Barnes, Joshua E.; Kewley, Lisa J.; Chambers, Kenneth, C. (May 2007). "Multiobject Spectroscopy of Young Star Clusters in NGC 4676". The Astrophysical Journal. 660 (2): L105–L108. arXiv:astro-ph/0703510. Bibcode:2007ApJ...660L.105C. doi:10.1086/518215. S2CID 119417388.
  3. Burbidge, E. M.; Burbidge, G. R. (March 1961). "NGC 4676, a Peculiar System in the Coma Cluster of Galaxies". The Astrophysical Journal. 133: 726. Bibcode:1961ApJ...133..726B. doi:10.1086/147076. ISSN 0004-637X.
  4. "Hubble's New Camera Delivers Breathtaking Views of the Universe". HubbleSite. 2002-04-30. Retrieved 2009-05-07.

Notes


  1. The size of NGC 4676 A is 194,000 ly, while that of NGC 4676 B is 186,000 ly. This would give 380,000 ly by combining their sizes although the tail is about two times larger, giving 760,000 ly.



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На других языках

[de] NGC 4676

NGC 4676 = IC 819/20 (manchmal Die Mäuse genannt) ist ein Paar interagierender Galaxien im Sternbild Coma Berenices am Nordsternhimmel, das etwa 296 Millionen Lichtjahre von der Milchstraße entfernt ist. Die beiden Galaxien kollidierten vor etwa 150 Millionen Jahren und werden in etwa 400 Millionen Jahren zu einer elliptischen Galaxie verschmelzen.
- [en] Mice Galaxies

[es] Colisión de las galaxias Los Ratones

Los Ratones (en inglés: The Mice) son un par de galaxias en la constelación de Coma Berenices que están en proceso de colisión y fusión. Su denominación es NGC 4676, y se encuentran a unos 300 millones de años luz de la Vía Láctea. El nombre proviene de sus largas colas.

[ru] Галактики Мышки

NGC 4676 или галактики Мышки (другие обозначения — ZWG 159.72, VV 224, ARP 242) — две спиральные галактики в созвездии Волосы Вероники. Они находятся на расстоянии около 290 миллионов световых лет от Земли. Эти галактики взаимодействуют и в будущем может произойти их слияние.


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