Astronomy: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] |
| Helio 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, UGC 6942, MCG+04-28-102, PGC 37629[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
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 (fr), NGC 3993 (fr), IC 746 (fr), CGCG 127-109 (d), and NGC 4015B (fr).[6][7]
Supernova
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
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 "Results for object NGC 3997". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+3997.
- ↑ 2.0 2.1 "Distance Results for NGC 3997". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+3997.
- ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 3997". https://cseligman.com/text/atlas/ngc39a.htm#3997.
- ↑ Asmus, D.; Greenwell, C. L.; Gandhi, P.; Boorman, P. G.; Aird, J.; Alexander, D. M.; Assef, R. J.; Baldi, R. D. et al. (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. doi:10.1093/mnras/staa766. Bibcode: 2020MNRAS.494.1784A.
- ↑ "NGC 3997". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+3997.
- ↑ 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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LGG+260.
- ↑ Boles, T.; Itagaki, K.; Nakano, S.; Kushida, Y. (2004). "Supernova 2004aw in NGC 3997". International Astronomical Union Circular (8310): 1. Bibcode: 2004IAUC.8310....1B. http://www.cbat.eps.harvard.edu/iauc/08300/08310.html#Item1.
- ↑ "SN 2004aw". IAU. https://www.wis-tns.org/object/2004aw.
External links
- NGC 3997 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
11h 57m 48.2299s, +25° 16′ 14.268″
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