NGC 4651

NGC 4651
NGC 4651. Note the umbrella-shaped stream.
Observation data (J2000 epoch)
Constellation	Coma Berenices
Right ascension	12^h 43^m 42.6^s^[1]
Declination	+16° 23′ 36″^[1]
Redshift	788 ± 2 km/s^[1]
Distance	72.0 Mly
Apparent magnitude (V)	11.39^[1]
Characteristics
Type	SA(rs)c^[1]
Apparent size (V)	4′.0 × 2′.6^[1]
Other designations
UGC 7901,^[1] PGC 42833^[1]

NGC 4651 imaged by the Hubble Space Telescope

NGC 4651 is a spiral galaxy located in the constellation of Coma Berenices that can be seen with amateur telescopes, at a distance not well determined that ranges from 35 million light years^[2] to 72 million light years^[3]

Features

This member of the Virgo Cluster, located on its outskirts,^[4] is known as the Umbrella Galaxy due to the umbrella-shaped structure that extends from its disk to the east and that it is composed of stellar streams, being the remmants of a much smaller galaxy that has been torn apart by NGC 4651's tidal forces,^[2]^[5] something that explains why NGC 4651 has been included on Halton Arp's Atlas of Peculiar Galaxies as Arp 189 -galaxy with filaments-.

Studies using radiotelescopes of the distribution of its neutral hydrogen show distortions on NGC 4651's outer regions and a gas clump associated with a dwarf galaxy that may have born in the event that produced the mentioned stellar streams^[6]

Unlike most spiral galaxies of the Virgo Cluster, NGC 4651 is rich in neutral hydrogen, also extending beyond the optical disk,^[6] and its star formation is the typical for a galaxy of its type.^[4]

References

1 2 3 4 5 6 7 8 "NASA/IPAC Extragalactic Database". Results for NGC 4651. Retrieved 2012-08-04.
1 2 Nemiroff, R.; Bonnell, J., eds. (15 April 2010). "NGC 4651: The Umbrella Galaxy". Astronomy Picture of the Day. NASA. Retrieved 2012-08-04.
↑ Solanes, J. M.; Sanchis, T.; Salvador-Solé, E.; Giovanelli, R.; Haynes, M. P. (2002). "The Three-dimensional Structure of the Virgo Cluster Region from Tully-Fisher and H I Data". The Astronomical Journal. 124 (5): 2440–2452. arXiv:astro-ph/0208147. Bibcode:2002AJ....124.2440S. doi:10.1086/344074.
1 2 Koopmann, R.; Kenney, J. D. P. (2004). "Hα Morphologies and Environmental Effects in Virgo Cluster Spiral Galaxies". The Astrophysical Journal. 613 (2): 866–885. arXiv:astro-ph/0406243. Bibcode:2004ApJ...613..866K. doi:10.1086/423191.
↑ "Stellar Tidal Streams in Spiral Galaxies of the Local Volume". Retrieved 2012-07-21.
1 2 Chung, A.; Van Gorkom, J.H.; Kenney, J.F.P.; Crowl, Hugh; Vollmer, B. (2009). "VLA Imaging of Virgo Spirals in Atomic Gas (VIVA). I. The Atlas and the H I Properties". The Astronomical Journal. 138 (6): 1741–1816. Bibcode:2009AJ....138.1741C. doi:10.1088/0004-6256/138/6/1741.

New General Catalogue 4500 to 4999

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Astronomical catalog List of NGC objects

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