NGC 7253 is a pair of spiral galaxies in the constellation Pegasus. It was discovered by the German-British astronomer Albert Marth on 9 September 1863.[2] It is listed in Halton Arp's Atlas of Peculiar Galaxies as Arp 278, as an example of gravitationally interacting galaxies.[3]
| NGC 7253 | |
|---|---|
 The spiral galaxy pair NGC 7253 imaged by Pan-STARRS | |
| Observation data (J2000 epoch) | |
| Constellation | Pegasus |
| Right ascension | 22h 19m 28.9s[1] |
| Declination | 29° 23′ 30.0″[1] |
| Redshift | 0.015738[1] |
| Heliocentric radial velocity | 4718 km/s[1] |
| Distance | 203.7 Mly (62.46 Mpc) & 200.4 Mly (61.43 Mpc)[1] |
| Apparent magnitude (V) | 13.2 & 14.3[1] |
| Characteristics | |
| Type | Double System[1] |
| Size | ~135,000 ly (41.40 kpc) & 71,400 ly (21.88 kpc) (estimated)[1] |
| Apparent size (V) | 1.7' x 0.8' & 1.6' x 0.5'[1] |
| Other designations | |
| Arp 278, UGC 11984 & 11985, MCG +05-52-010 & +05-52-011, PGC 68572 & 68573, CGCG 494-014, VV 242[1] | |
Of the pair, the galaxy to the north is known individually as NGC 7253A. Its velocity relative to the cosmic microwave background is 4,235 ± 24 km/s, which corresponds to a Hubble distance of 62.5 ± 4.4 Mpc (~204 million light-years).[1] The other galaxy in the pair is known individually as NGC 7253B. Its velocity relative to the cosmic microwave background is 4,165 ± 24 km/s, which corresponds to a Hubble distance of 61.4 ± 4.3 Mpc (~200 million light-years).[1]
With a surface brightness equal to 14.06 Mag/arcsec2, NGC 7253B can be described as a low surface brightness galaxy.
NGC 7253 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]
Supernova
editOne supernova has been observed in NGC 7253B: SN 2002jg (Type Ia, mag. 17) was discovered by Mike Schwartz and LOTOSS (Lick Observatory and Tenagra Observatory Supernova Searches) on 23 November 2002.[6][7]
Image Gallery
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NGC 7253 imaged by the Hubble Space Telescope (data processing by Judy Schmidt).
See also
editReferences
edit- 1 2 3 4 5 6 7 8 9 10 11 12 "Results for object NGC 7253". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 16 July 2024.
- ↑ Courtney Seligman. "Celestial Atlas Entry for NGC 7253". Retrieved 17 July 2024..
- ↑ Arp, Halton (1966). "Atlas of Peculiar Galaxies". The Astrophysical Journal Supplement Series. 14: 1. Bibcode:1966ApJS...14....1A. doi:10.1086/190147.
- ↑ 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 7253". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 July 2024.
- ↑ Ganeshalingam, M.; Li, W.; Schwartz, M. (2002). "Supernova 2002jg in NGC 7253". International Astronomical Union Circular (8022): 2. Bibcode:2002IAUC.8022....2G.
- ↑ "SN 2002jg". Transient Name Server. IAU. Retrieved 12 December 2024.
External links
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Media related to NGC 7253 at Wikimedia Commons- NGC 7253 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
