NGC 7020

NGC 2021 is a barred lenticular galaxy located about 140 million light-years away in the constellation Pavo.[3][4] NGC 7020 was discovered by astronomer John Herschel on August 31, 1836.[5]

NGC 7020
The ringed galaxy NGC 7020.
Observation data (J2000 epoch)
ConstellationPavo
Right ascension21h 11m 20.1s[1]
Declination−64° 01′ 31″.[1]
Redshift0.010677[1]
Helio radial velocity3201 km/s[1]
Distance138 Mly (42.4 Mpc)[1]
Apparent magnitude (V)12.78[1]
Characteristics
Type(R)SA0^+(r)[1]
Size~110,000 ly (33.6 kpc) (estimated)[2]
Apparent size (V)3.7 x 1.8[1]
Other designations
NGC 7021, ESO 107-13, PGC 66291[1]

Physical characteristics

NGC 7020 has a large outer ring surrounding a bright inner hexagonal zone containing an inner ring and possibly a bar. The large outer ring is completely detached from the inner hexagonal zone of the galaxy and is dominated by numerous flocculent spiral features. The outer ring has an estimated diameter of 110,000 ly (33.6 kpc). The ring is knotty and bluer than the rest of the galaxy and shows where recent star formation is occurring in NGC 7020. The possible inner ring shows protruding features at the ends of its major axis therefore classifying it as a bar. The galaxy appears to be fairly free of ionized gas, which is not surprising for an early-type galaxy.[2][6]

Nearby galaxies

NGC 7020 is member of a sparse group of galaxies that contains IC 5084, IC 5092, IC 5096, NGC 6943, NGC 7083, NGC 7096, NGC 7125, NGC 7126 and ESO 107-14.[7] However, NGC 7020 is not interacting with any other galaxy in the group.[8]

See also

References
  1. "NASA/IPAC Extragalactic Database". Results for NGC 7020. Retrieved 2017-06-06.
  2. Grouchy, R. D.; Buta, R. J; Salo, H.; Laurikainen, E. (3 May 2010). "RING STAR FORMATION RATES IN BARRED AND NONBARRED GALAXIES". The Astronomical Journal. 139 (6): 2465–2493. arXiv:1004.5063. Bibcode:2010AJ....139.2465G. doi:10.1088/0004-6256/139/6/2465.
  3. Rojas, Sebastián García. "Galaxy NGC 7020 - Galaxy in Pavo Constellation · Deep Sky Objects Browser". DSO Browser. Retrieved 2017-06-07.
  4. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2017-09-23.
  5. "New General Catalog Objects: NGC 7000 – 7049". cseligman.com. Retrieved 2017-04-15.
  6. "NGC 7020 - (R)SAB(r?)0/a". Retrieved 2017-06-07.
  7. Buta, R. (June 1990). "Weakly barred early-type ringed galaxies. III - The remarkable outer-ringed S0+ galaxy NGC 7020". The Astrophysical Journal. 356: 87–99. Bibcode:1990ApJ...356...87B. doi:10.1086/168819. ISSN 0004-637X.
  8. Ronald, Buta (November 1990). "The ringed X-galaxy NGC 7020". NASA Conference Publication. 3098 (124): 189. Bibcode:1990NASCP3098..189B.


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