Astronomy:NGC 7020

From HandWiki
(Redirected from Astronomy:NGC 7021)
NGC 7020
NGC 7020 imaged by Gemini South Observatory
Observation data (J2000 epoch)
ConstellationPavo
Right ascension 21h 11m 20.0493s[1]
Declination−64° 01′ 30.803″.[1]
Redshift0.010677±0.0000870[1]
Helio radial velocity3,201±26 km/s[1]
Distance95.89 ± 27.40 Mly (29.400 ± 8.400 Mpc)[2]
Apparent magnitude (V)12.78[1]
Characteristics
Type(R)SA0^+(r)[1]
Size~143,700 ly (44.05 kpc) (estimated)[1]
Apparent size (V)3.7′ × 1.8′[1]
Other designations
ESO 107-13, NGC 7021, PGC 66291[1]

NGC 7020 is a barred lenticular galaxy in the constellation Pavo.[3][4] Its velocity with respect to the cosmic microwave background is 3,102±27 km/s, which corresponds to a Hubble distance of 149.2 ± 10.6 Mly (45.75 ± 3.25 Mpc).[1] However, two non-redshift measurements give a much closer mean distance of 95.89 ± 27.40 Mly (29.400 ± 8.400 Mpc).[2] NGC 7020 was discovered by British astronomer John Herschel on June 22, 1835.[5]

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 143,700 ly (44.05 kpc).[1] 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.[6][7]

Nearby galaxies

NGC 7020 is member of a sparse group of galaxies that contains IC 5084 (fr), IC 5092 (fr), IC 5096 (fr), NGC 6943, NGC 7083, NGC 7096, NGC 7125 (fr), NGC 7126 (fr) and ESO 107-14 (d).[8] However, NGC 7020 is not interacting with any other galaxy in the group.[9]

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 "Results for object NGC 7020". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+7020. 
  2. ↑ 2.0 2.1 "Distance Results for NGC 7020". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+7020. 
  3. ↑ Rojas, Sebastián García. "Galaxy NGC 7020 - Galaxy in Pavo Constellation · Deep Sky Objects Browser" (in en). https://dso-browser.com/deep-sky/8207/ngc-7020/galaxy. 
  4. ↑ "Your NED Search Results". https://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+7020&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES. 
  5. ↑ "New General Catalog Objects: NGC 7000 – 7049" (in en-US). https://cseligman.com/text/atlas/ngc70.htm. 
  6. ↑ 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. doi:10.1088/0004-6256/139/6/2465. Bibcode: 2010AJ....139.2465G. 
  7. ↑ "NGC 7020 - (R)SAB(r?)0/a". https://kudzu.astr.ua.edu/devatlas/NGC_7020______B___________.html. 
  8. ↑ Buta, R. (June 1990). "Weakly barred early-type ringed galaxies. III - The remarkable outer-ringed S0+ galaxy NGC 7020" (in en). The Astrophysical Journal 356: 87–99. doi:10.1086/168819. ISSN 0004-637X. Bibcode: 1990ApJ...356...87B. 
  9. ↑ Ronald, Buta (November 1990). "The ringed X-galaxy NGC 7020" (in en). NASA Conference Publication 3098 (124): 189. Bibcode: 1990NASCP3098..189B. 

Coordinates: Sky map 21h 11m 20.0493s, −64° 01′ 30.803″ Template:NGC objects: 7001-7840



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:NGC_7020&oldid=4622701"