NGC 7793
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NGC 7793 is a flocculent spiral galaxy in the southern constellation of Sculptor. It was discovered on July 14, 1826, by Scottish astronomer James Dunlop.[1][2] The galaxy is located at a distance of Template:Cvt[3] million light years and is receding with a heliocentric radial velocity of Script error: No such module "val"..[4] NGC 7793 is one of the five brightest galaxies within the Sculptor Group.[5][6]
The morphological class of NGC 7793 is SA(s)d,[7] indicating it is unbarred spiral galaxy (SA) with no inner ring structure (s) and the arms are loosely wound and disorganized (d). It is flocculent in appearance with a very small bulge and a star cluster at the nucleus.[5] The galactic disk is inclined at an angle of 53.7° to the line of sight from the Earth. The visible profile is elliptical in form with an angular size of Script error: No such module "val".[5] and a major axis aligned along a position angle of 99.3°.[7] There are two nearby dwarf galaxy companions.[8]
NGC 7793 hosts the ultra-luminous X-ray pulsar (ULXP) referred to as NGC 7793 P13 (previously believed to harbor a black hole), which consists of a 0.42-second pulsar in a 64-day orbit with a 18–23 solar mass B9Ia companion star.[9]
Supernova
One supernova has been observed in NGC 7793. SN 2008bk (type II-P, mag. 12.6) was discovered by Berto Monard (bio-it) on March 25, 2008.[10][11][12] It reached apparent magnitude 12.5, making it the second-brightest supernova of 2008.[13] The progenitor of this supernova was a red supergiant, observed only 547 days prior to the explosion.[14]
Gallery
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Visual and infrared image of NGC 7793
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SN 2008bk before it exploded (left) and after the explosion (right)
See also
- List of NGC objects (7001–7840)
- NGC 300 – a similar spiral galaxy that is near NGC 7793
- NGC 2403 – a similar spiral galaxy
References
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External links
Template:Catalogs Template:Ngc80 Template:Sculptor (constellation)