Astronomy:NGC 7253

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NGC 7253
The spiral galaxy pair NGC 7253 imaged by Pan-STARRS
Observation data (J2000 epoch)
ConstellationPegasus
Right ascension 22h 19m 28.9s[1]
Declination29° 23′ 30.0″[1]
Redshift0.015738[1]
Helio radial velocity4718 km/s[1]
Distance203.7 Mly (62.46 Mpc) & 200.4 Mly (61.43 Mpc)[1]
Apparent magnitude (V)13.2 & 14.3[1]
Characteristics
TypeDouble 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[1]

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.

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

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.[6][7]

See also

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 "Results for object NGC 7253". NASA and Caltech. http://ned.ipac.caltech.edu/byname?objname=NGC+7253. 
  2. ↑ Courtney Seligman. "Celestial Atlas Entry for NGC 7253". http://cseligman.com/text/atlas/ngc72a.htm#7253. .
  3. ↑ Arp, Halton (1966). "Atlas of Peculiar Galaxies". The Astrophysical Journal Supplement Series 14: 1. doi:10.1086/190147. Bibcode: 1966ApJS...14....1A. 
  4. ↑ 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. 
  5. ↑ "NGC 7253". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+7253. 
  6. ↑ Ganeshalingam, M.; Li, W.; Schwartz, M. (2002). "Supernova 2002jg in NGC 7253". International Astronomical Union Circular (8022): 2. Bibcode: 2002IAUC.8022....2G. http://www.cbat.eps.harvard.edu/iauc/08000/08022.html#Item2. 
  7. ↑ "SN 2002jg". IAU. https://www.wis-tns.org/object/2002jg. 

Coordinates: Sky map 22h 19m 28.9s, +29° 23′ 30.0″



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