NGC 7253

NGC 7253
The spiral galaxy pair NGC 7253 imaged by the Gemini North telescope
Observation data (J2000 epoch)
ConstellationPegasus
Right ascension22h 19m 28.9s
Declination29° 23′ 30.0″
Redshift0.015738
Heliocentric radial velocity4718 km/s
Distance203.7 Mly (62.46 Mpc) & 200.4 Mly (61.43 Mpc)
Apparent magnitude (V)13.2 & 14.3
Characteristics
TypeDouble System
Size~135,000 ly (41.40 kpc) & 71,400 ly (21.88 kpc) (estimated)
Apparent size (V)1.7' x 0.8' & 1.6' x 0.5'
Other designations
Arp 278, UGC 11984 & 11985, MCG +05-52-010 & +05-52-011, PGC 68572 & 68573, CGCG 494-014, VV 242

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. It is listed in Halton Arp's Atlas of Peculiar Galaxies as Arp 278, as an example of gravitationally interacting galaxies.

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). 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).

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.

Supernova

One 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.

See also

References

  1. 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.
  2. ↑ Courtney Seligman. "Celestial Atlas Entry for NGC 7253". Retrieved 17 July 2024..
  3. ↑ Arp, Halton (1966). "Atlas of Peculiar Galaxies". The Astrophysical Journal Supplement Series. 14: 1. Bibcode:1966ApJS...14....1A. doi:10.1086/190147.
  4. ↑ 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.
  5. ↑ "NGC 7253". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 July 2024.
  6. ↑ Ganeshalingam, M.; Li, W.; Schwartz, M. (2002). "Supernova 2002jg in NGC 7253". International Astronomical Union Circular (8022): 2. Bibcode:2002IAUC.8022....2G.
  7. ↑ "SN 2002jg". Transient Name Server. IAU. Retrieved 12 December 2024.