NGC 7020 explained

NGC 7020
Epoch:J2000
Type:(R)SA0^+(r)[1]
Dec:.
Dist Ly:42.4Mpc
Z:0.010677
H Radial V:3201 km/s
Appmag V:12.78
Size V:3.7 x 1.8
Constellation Name:Pavo
Names:NGC 7021, ESO 107-13, PGC 66291
Size:~33.6kpc (estimated)

NGC 7020 is a barred lenticular galaxy located about 140 million light-years away in the constellation Pavo.[2] [3] NGC 7020 was discovered by astronomer John Herschel on August 31, 1836.[4]

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 33.6kpc. 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.[5] [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

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 7020 . 2017-06-06 .
  2. Web site: Galaxy NGC 7020 - Galaxy in Pavo Constellation · Deep Sky Objects Browser. Rojas. Sebastián García. DSO Browser. en. 2017-06-07. 2017-08-13. https://web.archive.org/web/20170813105005/https://dso-browser.com/deep-sky/8207/ngc-7020/galaxy. dead.
  3. Web site: Your NED Search Results. ned.ipac.caltech.edu. 2017-09-23.
  4. Web site: New General Catalog Objects: NGC 7000 – 7049. cseligman.com. en-US. 2017-04-15.
  5. Grouchy. R. D.. Buta. R. J. Salo. H.. Laurikainen. E.. Ring Star Formation Rates in Barred and Nonbarred Galaxies. 3 May 2010. The Astronomical Journal. 139. 6. 2465–2493. 10.1088/0004-6256/139/6/2465. 2010AJ....139.2465G. 1004.5063. 119099302.
  6. Web site: NGC 7020 - (R)SAB(r?)0/a. 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. en. 356. 87–99. 10.1086/168819. 0004-637X. 1990ApJ...356...87B.
  8. Ronald. Buta. November 1990. The ringed X-galaxy NGC 7020. NASA Conference Publication. en. 3098. 124. 189. 1990NASCP3098..189B.