NGC 7020

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NGC 7020
NGC7020 - Iotw2224a.jpg
The ringed galaxy NGC 7020.
Observation data (J2000 epoch)
Constellation Pavo
Right ascension 21h 11m 20.1s [1]
Declination −64° 01′ 31″. [1]
Redshift 0.010677 [1]
Heliocentric radial velocity 3201 km/s [1]
Distance 138  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]

NGC 7020 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]

Contents

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

Related Research Articles

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NGC 6782 is a barred spiral galaxy located in the southern constellation of Pavo, at a distance of approximately 173 megalight-years from the Milky Way. It was discovered on July 12, 1834 by English astronomer John Herschel. John L. E. Dreyer described it as, "considerably faint, considerably small, round, a little brighter middle, 9th magnitude star to south". The morphological classification of NGC 6782 is (R1R′2)SB(r)a, indicating a barred spiral galaxy with a multiple ring system and tightly-wound spiral arms. It is seen nearly face-on, being inclined by an angle of 27.2°±0.2° to the line of sight from the Earth.

<span class="mw-page-title-main">NGC 5364</span> Spiral galaxy in the constellation Virgo

NGC 5364 is a grand design spiral galaxy located 54.5 million light years away in the constellation Virgo. It is inclined to the line of sight from the Earth at an angle of 47° along a position angle of 25°. It is a member of the NGC 5364 Group of galaxies, itself one of the Virgo III Groups strung out to the east of the Virgo Supercluster of galaxies.

<span class="mw-page-title-main">NGC 3344</span> Galaxy in the constellation Leo Minor

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<span class="mw-page-title-main">NGC 7013</span> Spiral or lenticular galaxy in the constellation Cygnus

NGC 7013 is a relatively nearby spiral or lenticular galaxy estimated to be around 37 to 41.4 million light-years away from Earth in the constellation of Cygnus. NGC 7013 was discovered by English astronomer William Herschel on July 17, 1784 and was also observed by his son, astronomer John Herschel on September 15, 1828.

<span class="mw-page-title-main">NGC 7098</span> Galaxy in the constellation Octans

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<span class="mw-page-title-main">NGC 7060</span> Galaxy in the constellation Microscopium

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<span class="mw-page-title-main">NGC 4274</span> Galaxy in the constellation Coma Berenices

NGC 4274 is a barred spiral galaxy located in the constellation Coma Berenices. It is located at a distance of circa 45 million light years from Earth, which, given its apparent dimensions, means that NGC 4274 is about 95,000 light years across. It was discovered by William Herschel in 1785.

<span class="mw-page-title-main">NGC 7079</span> Galaxy in the constellation of Grus

NGC 7079 is a barred lenticular galaxy located about 110.58 million light-years away in the constellation of Grus. NGC 7079 is also classified as a LINER galaxy. It is tilted about 51° to the Earth's line of sight. NGC 7079 was discovered by astronomer John Herschel on September 6, 1834.

<span class="mw-page-title-main">ESO 198-13</span> Ring galaxy in the constellation Eridanus

ESO 198-13 is a ring galaxy with multiple ring-like structures located about 240 million light-years away in the constellation Eridanus.

<span class="mw-page-title-main">NGC 7087</span> Galaxy in the constellation of Grus

NGC 7087 is a barred spiral galaxy located about 215 million light-years away in the constellation of Grus. NGC 7087 was discovered by astronomer John Herschel on September 4, 1834.

<span class="mw-page-title-main">NGC 4473</span> Galaxy in the constellation Coma Berenices

NGC 4473 is an elliptical galaxy located about 50 million light-years away in the constellation of Coma Berenices. It was discovered by astronomer William Herschel on April 8, 1784. NGC 4473 has an inclination of about 71°. NGC 4473 is a member of a chain of galaxies called Markarian's Chain which is part of the larger Virgo Cluster of galaxies.

<span class="mw-page-title-main">NGC 4340</span> Galaxy in the constellation Coma Berenices

NGC 4340 is a double-barred lenticular galaxy located about 55 million light-years away in the constellation of Coma Berenices. NGC 4340 was discovered by astronomer William Herschel on March 21, 1784. NGC 4340 is a member of the Virgo Cluster. NGC 4340 is generally thought to be in a pair with the galaxy NGC 4350.

<span class="mw-page-title-main">NGC 4457</span> Galaxy in the constellation of Virgo

NGC 4457 is an intermediate spiral galaxy located about 55 million light-years away in the constellation of Virgo. It is also classified as a LINER galaxy, a class of active galaxy defined by their spectral line emissions. NGC 4457 Is inclined by about 33°. It was discovered by astronomer William Herschel on February 23, 1784. Despite being listed in the Virgo Cluster Catalog as VCC 1145, NGC 4457 is a member of the Virgo II Groups which form an extension of the Virgo cluster.

<span class="mw-page-title-main">NGC 4612</span> Galaxy in the constellation Virgo

NGC 4612 is a barred lenticular galaxy located about 57 million light-years away in the constellation of Virgo. NGC 4612 was discovered by astronomer William Herschel on January 23, 1784. The galaxy is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 6753</span> Galaxy in the constellation Pavo

NGC 6753 is a massive unbarred spiral galaxy, seen almost exactly face-on, in the southern constellation of Pavo. It was discovered by the English astronomer John Herschel on July 5, 1836. The galaxy is located at a distance of 142 million light years from the Milky Way, and is receding with a heliocentric radial velocity of 3,140 km/s. It does not display any indications of a recent interaction with another galaxy or cluster.

<span class="mw-page-title-main">NGC 4429</span> Galaxy in the constellation Virgo

NGC 4429 is a lenticular galaxy located about 55 million light-years away in the constellation of Virgo. NGC 4429 is tilted at an inclination of about 75° which means that the galaxy is tilted almost edge-on as seen from Earth. NGC 4429 was discovered by astronomer William Herschel on March 15, 1784. The galaxy is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 4689</span> Galaxy in the constellation Coma Berenices

NGC 4689 is a spiral galaxy located about 54 million light-years away in the constellation of Coma Berenices. NGC 4689 is also classified as a LINER galaxy. NGC 4689 is inclined at an angle of about 36° which means that the galaxy is seen almost face-on to the Earth's line of sight. NGC 4689 was discovered by astronomer William Herschel on April 12, 1784. The galaxy is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 3313</span> Galaxy in the constellation Hydra

NGC 3313 is a large barred spiral galaxy located about 55 megaparsecs away in the constellation Hydra. It was discovered by astronomer Ormond Stone in 1886 and is an outlying member of the Hydra Cluster.

<span class="mw-page-title-main">NGC 7531</span> Galaxy in the constellation Grus

NGC 7531 is an intermediate spiral galaxy located in the constellation Grus. It is located at a distance of about 70 million light-years from Earth, which, given its apparent dimensions, means that NGC 7531 is about 95,000 light years across. It was discovered by John Herschel on September 2, 1836.

<span class="mw-page-title-main">NGC 4513</span> Galaxy in the constellation Draco

NGC 4513 is a lenticular galaxy and a ring galaxy located about 110 million light-years away in the constellation Draco. It was discovered by astronomer Heinrich d'Arrest on October 16, 1866.

References

  1. 1 2 3 4 5 6 7 8 9 "NASA/IPAC Extragalactic Database". Results for NGC 7020. Retrieved 2017-06-06.
  2. 1 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. S2CID   119099302.
  3. ↑ Rojas, Sebastián García. "Galaxy NGC 7020 - Galaxy in Pavo Constellation · Deep Sky Objects Browser". DSO Browser. Archived from the original on 2017-08-13. 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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