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NGC 1365, also known as the Great Barred Spiral Galaxy,[3] is a double-barred spiral galaxy about 56 million light-years away in the constellation Fornax. Within the larger long bar stretching across the center of the galaxy appears to be a smaller bar that comprises the core, with an apparent size of about 50″ × 40″.[4]This second bar is more notable in infrared images of the central region of the galaxy, and likely arises from a combination of dynamical instabilities of stellar orbits in the region, along with gravity, density waves, and the overall rotation of the disc. The inner bar structure likely rotates as a whole more rapidly than the larger long bar, creating the diagonal shape seen in images. The spiral arms extend in a wide curve north and south from the ends of the east-west bar and form an almost ring like Z-shaped halo.[4]

NGC 1365
Credit: ESO
Observation data (J2000 epoch)
Right ascension 03h 33m 36.4s[1]
Declination−36° 08′ 25″[1]
Redshift1636 ± 1 km/s[1]
Distance56.2 ± 2.6 Mly (17.2 ± 0.8 Mpc)[2]
Apparent magnitude (V)10.3[1]
Apparent size (V)11′.2 × 6′.2[1]
Other designations
ESO 358- G 017, VV 825, MCG -06-08-026, PGC 13179[1]
See also: Galaxy, List of galaxies

Supernovae 2012fr, 2001du, 1983V, and 1957C were observed in NGC 1365.

The central supermassive black hole in the active nucleus, measured to be about 2 million solar masses in size, rotates close to the relativistic limit (the dimensionless spin parameter is larger than 0.84). These observations, announced in February 2013, were made using the X-ray telescope satellite NuSTAR.[5][6]

See alsoEdit


  1. ^ a b c d e f g "NASA/IPAC Extragalactic Database". Results for NGC 1365. Retrieved 2006-11-21.
  2. ^ Jensen, Joseph B.; Tonry, John L.; Barris, Brian J.; Thompson, Rodger I.; et al. (February 2003). "Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations". Astrophysical Journal. 583 (2): 712–726. arXiv:astro-ph/0210129. Bibcode:2003ApJ...583..712J. doi:10.1086/345430.
  3. ^ Garlick, Mark A. (2004). Astronomy: A Visual Guide. Firefly Books. p. 293. ISBN 978-1-55297-958-7.
  4. ^ a b Kepple, George Robert; Glen W. Sanner (1998). The Night Sky Observer's Guide. 1. Willmann-Bell, Inc. p. 198. ISBN 978-0-943396-58-3.
  5. ^ Reynolds, Christopher (2013). "Astrophysics: Black holes in a spin". Nature. 494 (7438): 432–433. Bibcode:2013Natur.494..432R. doi:10.1038/494432a. PMID 23446411.
  6. ^ - Unambiguous Determination of the Spin of the Black Hole in NGC 1365

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