NGC 7682 is abarred spiral galaxy in theconstellationPisces. It is located at a distance of about 180 millionlight years from Earth, which, given its apparent dimensions, means that NGC 7682 is about 65,000 light years across. It was discovered byHeinrich d'Arrest on September 23, 1864.[3]
The galaxy has a bar and two weakspiral arms which form a ring.[4][5] The nucleus of NGC 7682 has been found to beactive and has been categorised as a type 2Seyfert galaxy.[6] The most accepted theory for the energy source of Seyfert galaxies is the presence of anaccretion disk around asupermassive black hole. The supermassive hole in the nucleus of NGC 7682 is estimated to be 17–62 million (107.56±0.33)M☉.[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] Ajet was reported to be present inH-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 withNGC 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]
^abMartini, Paul; Regan, Michael W.; Mulchaey, John S.; Pogge, Richard W. (June 2003). "Circumnuclear Dust in Nearby Active and Inactive Galaxies. I. Data".The Astrophysical Journal Supplement Series.146 (2):353–406.arXiv:astro-ph/0212396.Bibcode:2003ApJS..146..353M.doi:10.1086/367817.
^Keel, W. C. (April 1985). "A radio-quiet emission-line jet in the type 2 Seyfert galaxy NGC 7682".The Astronomical Journal.90: 577.Bibcode:1985AJ.....90..577K.doi:10.1086/113762.
^Brodie, Jean; Willick, Jeffrey A.; Bowyer, Stuart; Henry, J. Patrick (May 1987). "Narrowband imaging and spectroscopy close to the nucleus of the Seyfert galaxy NGC 7682".The Astronomical Journal.93: 1054.Bibcode:1987AJ.....93.1054B.doi:10.1086/114388.
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