NGC 3997
| NGC 3997 | |
|---|---|
 NGC 3997 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Leo |
| Right ascension | 11h 57m 48.2299s[1] |
| Declination | +25° 16′ 14.268″[1] |
| Redshift | 0.015914±0.0000170[1] |
| Heliocentric radial velocity | 4,771±5 km/s[1] |
| Distance | 274.30 Mly (84.100 Mpc)[2] |
| Group or cluster | NGC 3997 Group (LGG 260) |
| Apparent magnitude (V) | 14.02[1] |
| Characteristics | |
| Type | SBb pec[1] |
| Size | ~132,500 ly (40.61 kpc) (estimated)[1] |
| Apparent size (V) | 1.7′ × 0.6′[1] |
| Other designations | |
| HOLM 308B, IRAS 11552+2532, 2MASX J11574822+2516142, UGC 6942, MCG +04-28-102, PGC 37629, CGCG 127-114[1] | |
NGC 3997 is a peculiar barred spiral galaxy in the constellation of Leo. Its velocity with respect to the cosmic microwave background is 5,078±22 km/s, which corresponds to a Hubble distance of 244.3 ± 17.1 Mly (74.90 ± 5.25 Mpc).[1] Additionally, one non-redshift measurement gives a farther distance of 274.30 Mly (84.100 Mpc).[2] It was discovered by British astronomer John Herschel on 19 February 1827.[3]
NGC 3997 has a possible active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.[4][5]
NGC 3997 group
[edit]NGC 3997 is a member of a group of galaxies named after it (also known as LGG 260). This group contains 6 galaxies, including NGC 3989, NGC 3993, IC 746, CGCG 127-109, and NGC 4015B.[6][7]
Supernova
[edit]One supernova has been observed in NGC 3997:
- SN 2004aw (Type Ic, mag. 17.1) was discovered independently by Tom Boles and Kōichi Itagaki on 10 March 2004.[8][9]
See also
[edit]References
[edit]- 1 2 3 4 5 6 7 8 9 10 "Results for object NGC 3997". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 25 March 2026.
- 1 2 "Distance Results for NGC 3997". NASA/IPAC Extragalactic Database. NASA. Retrieved 25 March 2026.
- ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 3997". Celestial Atlas. Retrieved 25 March 2026.
- ↑ Asmus, D.; Greenwell, C. L.; Gandhi, P.; Boorman, P. G.; Aird, J.; Alexander, D. M.; Assef, R. J.; Baldi, R. D.; Davies, R. I.; Hönig, S. F.; Ricci, C.; Rosario, D. J.; Salvato, M.; Shankar, F.; Stern, D. (2020). "Local AGN survey (LASr): I. Galaxy sample, infrared colour selection, and predictions for AGN within 100 MPC". Monthly Notices of the Royal Astronomical Society. 494 (2): 1784. arXiv:2003.05959. Bibcode:2020MNRAS.494.1784A. doi:10.1093/mnras/staa766.
- ↑ "NGC 3997". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 March 2026.
- ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47. Bibcode:1993A&AS..100...47G.
- ↑ "LGG 260". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 March 2026.
- ↑ Boles, T.; Itagaki, K.; Nakano, S.; Kushida, Y. (2004). "Supernova 2004aw in NGC 3997". International Astronomical Union Circular (8310): 1. Bibcode:2004IAUC.8310....1B.
- ↑ "SN 2004aw". Transient Name Server. IAU. Retrieved 25 March 2026.
External links
[edit]
Media related to NGC 3997 at Wikimedia Commons- NGC 3997 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
