NGC 7682 explained

NGC 7682
Credit:HST/NASA/ESA.
Epoch:J2000
Type:SB(r)ab[1]
Dist Ly:177 ± 5 Mly (54.2 ± 1.5 Mpc)
Z:0.017139 ± 0.000013
H Radial V:5,120 ± 4 km/s
Appmag V:13.3[2]
Size V:1.2 × 1.1
Constellation Name:Pisces
Notes:Seyfert galaxy

NGC 7682 is a barred spiral galaxy in the constellation Pisces. It is located at a distance of about 180 million light years from Earth, which, given its apparent dimensions, means that NGC 7682 is about 65,000 light years across. It was discovered by Heinrich d'Arrest on September 23, 1864.[3]

The galaxy has a bar and two weak spiral arms which form a ring.[4] [5] The nucleus of NGC 7682 has been found to be active and has been categorised as a type 2 Seyfert galaxy.[6] The most accepted theory for the energy source of Seyfert galaxies is the presence of an accretion disk around a supermassive black hole. The supermassive hole in the nucleus of NGC 7682 is estimated to be 17–62 million (10) .[7] Ionised H-alpha, [N II] and [O III] gas has been detected along with [Ne V], [Si VI] and [Si VIII].[6] Ionization cones are observed north and south of the nucleus.[5] A jet was reported to be present in H-alpha and NII imaging by W. C. Keel in 1985[8] but further observations didn't confirm its presence.[9]

NGC 7682 forms a pair with NGC 7679. NGC 7682 lies at a distance of 269.7 arcseconds, which corresponds to a projected distance of 97 kpc.[10] The two galaxies are connected by a hydrogen bridge, a sign of a closer encounter in the past 500 million years.[11] It is possible that the interaction of the two galaxies caused star formation in NGC 7679.[12]

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 7682 . 2020-11-03.
  2. Web site: Revised NGC Data for NGC 7682 . spider.seds.org . 25 November 2018.
  3. Web site: Seligman . Courtney . NGC 7682 (= PGC 71566, and with NGC 7679 = Arp 216) . Celestial Atlas . 19 November 2018.
  4. High-resolution radio observations of the CfA Seyfert Sample – I. The observations . Monthly Notices of the Royal Astronomical Society . 15 October 1995 . 10.1093/mnras/276.4.1262.
  5. Martini . Paul . Regan . Michael W. . Mulchaey . John S. . Pogge . Richard W. . Circumnuclear Dust in Nearby Active and Inactive Galaxies. I. Data . The Astrophysical Journal Supplement Series . June 2003 . 146 . 2 . 353–406 . 10.1086/367817. astro-ph/0212396 . 2003ApJS..146..353M .
  6. Mazzalay . Ximena . Rodríguez-Ardila . Alberto . Komossa . S. . Demystifying the coronal-line region of active galactic nuclei: spatially resolved spectroscopy with the Hubble Space Telescope . Monthly Notices of the Royal Astronomical Society . April 2010 . 405 . 2 . 1315 . 10.1111/j.1365-2966.2010.16533.x. 1002.3152 . 2010MNRAS.405.1315M .
  7. Bosch . Remco C. E. van den . Unification of the Fundamental Plane and Super Massive Black Hole Masses . The Astrophysical Journal . 10 November 2016 . 831 . 2 . 134 . 10.3847/0004-637X/831/2/134. free . 1606.01246 . 2016ApJ...831..134V .
  8. Keel . W. C. . A radio-quiet emission-line jet in the type 2 Seyfert galaxy NGC 7682 . The Astronomical Journal . April 1985 . 90 . 577 . 10.1086/113762. 1985AJ.....90..577K .
  9. Brodie . Jean . Willick . Jeffrey A. . Bowyer . Stuart . Henry . J. Patrick . Narrowband imaging and spectroscopy close to the nucleus of the Seyfert galaxy NGC 7682 . The Astronomical Journal . May 1987 . 93 . 1054 . 10.1086/114388. 1987AJ.....93.1054B .
  10. Ricci . C. . Bauer . F. E. . Treister . E. . Schawinski . K. . Privon . G. C. . Blecha . L. . Arevalo . P. . Armus . L. . Harrison . F. . Ho . L. C. . Iwasawa . K. . Sanders . D. B. . Stern . D. . Growing supermassive black holes in the late stages of galaxy mergers are heavily obscured . Monthly Notices of the Royal Astronomical Society . 23 January 2017 . stx173 . 10.1093/mnras/stx173. free . 20.500.11850/213867 . free .
  11. Buson . L. M. . Cappellari . M. . Corsini . E. M. . Held . E. V. . Lim . J. . Pizzella . A. . NGC 7679: an anomalous, composite Seyfert 1 galaxy whose X-ray luminous AGN vanishes at optical wavelengths . Astronomy & Astrophysics . February 2006 . 447 . 2 . 441–451 . 10.1051/0004-6361:20053204. astro-ph/0510034 . 2006A&A...447..441B . free .
  12. Yankulova . I. M. . Golev . V. K. . Jockers . K. . The luminous infrared composite Seyfert 2 galaxy NGC 7679 through the [O III] λ 5007 emission line . Astronomy & Astrophysics . July 2007 . 469 . 3 . 891–898 . 10.1051/0004-6361:20077440. free . 0704.0768 .

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