NGC 3657
| NGC 3657 | |
|---|---|
 SDSS image of NGC 3657. | |
| Observation data (2000.0 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 11h 23m 55.6s[1] |
| Declination | 52° 55′ 15″[1] |
| Redshift | 0.004059[1] |
| Heliocentric radial velocity | 1217 km/s[1] |
| Distance | 63 Mly (19.2 Mpc)[1] |
| Apparent magnitude (V) | 13.5[1] |
| Absolute magnitude (B) | -21.23[1] |
| Characteristics | |
| Type | SAB(rs)c pec[1] |
| Mass | 4.6×109 (Stellar mass)[2] M☉ |
| Size | ~136,600 ly (41.88 kpc) (estimated)[1] |
| Apparent size (V) | 1.03 × 0.79[1] |
| Other designations | |
| UGC 06406, CGCG 268-030, MCG +09-19-065, PGC 035002[1] | |
NGC 3657 is a peculiar spiral galaxy located approximately 63 million light-years away[3] in the constellation Ursa Major. It was discovered April 12, 1789 by William Herschel.[4] NGC 3657 is a member of the NGC 3631 Group[5][6][7] which is part of the Ursa Major Cloud.[5][8]
NGC 3657 has a huge ultraviolet extended disk revealed by the GALEX space telescope which suggests that NGC 3657 contains an extended HI reservoir. The galaxy has an unusually low ratio of the mass of dust (Mdust) to the mass of neutral atomic hydrogen (MHI) with its extended HI reservoir where star formation is not observed. This indicates that NGC 3657 has either only recently accreted gas from the outside environment or the HI gas in the galaxy has insufficient density to collapse and form stars.[9]
The galaxy hosts a supermassive black hole with an estimated mass of 4.3 × 106 M☉.[10]
See also
[edit]References
[edit]- ^ a b c d e f g h i j k "NASA/IPAC Extragalactic Database". Results for NGC 3657. Retrieved 2025-06-17.
- ^ Leroy, Adam K.; Sandstrom, Karin M.; Lang, Dustin; Lewis, Alexia; Salim, Samir; Behrens, Erica A.; Chastenet, Jérémy; Chiang, I.-Da; Gallagher, Molly J.; Kessler, Sarah; Utomo, Dyas (October 2019). "A z = 0 Multiwavelength Galaxy Synthesis. I. A WISE and GALEX Atlas of Local Galaxies". The Astrophysical Journal Supplement Series. 244 (2): 24. arXiv:1910.13470. Bibcode:2019ApJS..244...24L. doi:10.3847/1538-4365/ab3925. ISSN 0067-0049.
- ^ "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2025-06-17.
- ^ "New General Catalog Objects: NGC 3650 - 3699". cseligman.com. Retrieved 2025-06-17.
- ^ a b Tully, R. Brent (1988). Nearby galaxies catalog (1. publ ed.). Cambridge: Cambridge University Press. ISBN 978-0-521-35299-4.
- ^ Garcia, A. M. (July 1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47–90. Bibcode:1993A&AS..100...47G. ISSN 0365-0138.
- ^ Makarov, Dmitry; Karachentsev, Igor (2011-04-21). "Galaxy groups and clouds in the local (z∼ 0.01) Universe: Galaxy groups in the local Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. doi:10.1111/j.1365-2966.2010.18071.x.
- ^ Karachentsev, I. D.; Nasonova, O. G.; Courtois, H. M. (2013-03-01). "Anatomy of Ursa Majoris". Monthly Notices of the Royal Astronomical Society. 429 (3): 2264–2273. doi:10.1093/mnras/sts494. ISSN 1365-2966.
- ^ Cortese, L.; Ciesla, L.; Boselli, A.; Bianchi, S.; Gomez, H.; Smith, M. W. L.; Bendo, G. J.; Eales, S.; Pohlen, M.; Baes, M.; Corbelli, E.; Davies, J. I.; Hughes, T. M.; Hunt, L. K.; Madden, S. C. (April 2012). "The dust scaling relations of the Herschel Reference Survey". Astronomy and Astrophysics. 540: A52. arXiv:1201.2762. Bibcode:2012A&A...540A..52C. doi:10.1051/0004-6361/201118499. ISSN 0004-6361.
- ^ Arzoumanian, Zaven; Baker, Paul T.; Brazier, Adam; Brook, Paul R.; Burke-Spolaor, Sarah; Becsy, Bence; Charisi, Maria; Chatterjee, Shami; Cordes, James M.; Cornish, Neil J.; Crawford, Fronefield; Cromartie, H. Thankful; Decesar, Megan E.; Demorest, Paul B.; Dolch, Timothy (2021-06-01). "The NANOGrav 11 yr Data Set: Limits on Supermassive Black Hole Binaries in Galaxies within 500 Mpc". The Astrophysical Journal. 914 (2): 121. arXiv:2101.02716. Bibcode:2021ApJ...914..121A. doi:10.3847/1538-4357/abfcd3. ISSN 0004-637X.
External links
[edit]
Media related to NGC 3657 at Wikimedia Commons
