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]

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.

According to the Simbad database, NGC 7253 is a candidate for the title of active galaxy nucleus.[4]

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.[5][6]

See also

References

  1. ^ a b c d e f g h i j k l "NASA/IPAC Extragalactic Database". Results for NGC 7253. Retrieved 16 July 2024.
  2. ^ Courtney Seligman. "Celestial Atlas Table of Contents, NGC 7250 - 7299". 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. ^ SIMBAD entry for NGC 7253 Retrieved 17 July 2024.
  5. ^ Ganeshalingam, M.; Li, W.; Schwartz, M. (2002). "Supernova 2002jg in NGC 7253". International Astronomical Union Circular (8022): 2. Bibcode:2002IAUC.8022....2G.
  6. ^ "SN 2002jg". Transient Name Server. IAU. Retrieved 12 December 2024.
Allikas: https://en.wikipedia.org/wiki/NGC_7253
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