Astronomy:NGC 1313

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NGC 1313
A Very Large Telescope (VLT) image of NGC 1313.
Credit: ESO.
Observation data (J2000.0 epoch)
ConstellationReticulum
Right ascension 03h 18m 15.4s [1]
Declination−66° 29′ 50″ [1]
Redshift0.001568 [1]
Distance12.886 Mly[1]
Characteristics
TypeSB(s)d[1]
Apparent size (V)9.1 x 7.1 arcmin[1]
Other designations
Topsy Turvy Galaxy, PGC 12286, ESO 082- G 011

NGC 1313 (also known as the Topsy Turvy Galaxy[2]) is a field galaxy[3] and an irregular galaxy[4] discovered by the Scottish astronomer James Dunlop on 27 September 1826.[5] It has a diameter of about 50,000 light-years, or about half the size of the Milky Way.[6]

NGC 1313 lies within the Virgo Supercluster.[7]

In 2007, a rare WO star was discovered in NGC 1313,[8] currently known by its only designation of [HC2007] 31. It is of spectral type WO3.[8] The derived absolute magnitude is about -5,[8] which is very high for a single WO star. (WOs usually have absolute magnitudes of about -1 to -4) This means that the WO is likely part of a binary or a small stellar association.[8]

Supernovae

Two supernovae have been observed in NGC 2841:

  • SN 1962M (type II, mag. 11.7) was discovered by José Sérsic on 26 November 1962.[9][10]
  • SN 1978K (type IIn, mag. 16) was discovered by Stuart Ryder in January 1990 and originally reported as a nova.[11] However, a search of archival photographs revealed an outburst on 31 July 1978, and all data indicated that it was a very unusual type II supernova.[12]

Features

NGC 1313 has a strikingly uneven shape and its axis of rotation is not exactly in its centre.[13] NGC 1313 also shows strong starburst activity[14] and associated supershells.[15] NGC 1313 is dominated by scattered patches of intense star formation, which gives the galaxy a rather ragged appearance.[16] The uneven shape, the ragged appearance and the strong starburst can all be explained by a galactic collision in the past.[17] However, NGC 1313 seems to be an isolated galaxy and has no direct neighbours. Therefore, it is not clear whether it has swallowed a small companion in its past.[2]

Young, blue stars are scattered across the galaxy.[18] This is evidence of infant mortality in which the young open clusters quickly became gravitationally "unglued", scattering their resident stars into the galaxy.[19] The galaxy bears some resemblance to the Magellanic Clouds[20] and hosts two ultraluminous X-ray sources, called NGC 1313 X-1 and X-2.[21] The former is a rare intermediate-mass black hole.[22][23]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "NASA/IPAC Extragalactic Database". Results for NGC 1313. https://ned.ipac.caltech.edu/byname?objname=NGC1313&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  2. ↑ 2.0 2.1 "The Topsy-Turvy Galaxy NGC 1313". ESO. 23 November 2006. https://www.eso.org/public/images/eso0643a/. 
  3. ↑ "Taking a narrow view of lopsided galaxy". Gemini Observatory. 21 May 2010. http://cseligman.com/text/atlas/ngc13.htm#1313. 
  4. ↑ Nemiroff, R.; Bonnell, J., eds (7 August 2009). "The Star Clusters of NGC 1313". Astronomy Picture of the Day. NASA. https://apod.nasa.gov/apod/ap090807.html. 
  5. ↑ Courtney Seligman. "NGC 1313 (= PGC 12286)". Celestial Atlas. http://cseligman.com/text/atlas/ngc13.htm#1313. 
  6. ↑ Nemiroff, R.; Bonnell, J., eds (30 March 2010). "Unusual Starburst Galaxy NGC 1313". Astronomy Picture of the Day. NASA. https://apod.nasa.gov/apod/ap100330.html. 
  7. ↑ "Nearby Groups of Galaxies". https://ned.ipac.caltech.edu/level5/Dev2/Dev9.html. 
  8. ↑ 8.0 8.1 8.2 8.3 Hadfield, L. J.; Crowther, P. A. (2007-10-01). "A survey of the Wolf-Rayet population of the barred, spiral galaxy NGC 1313". Monthly Notices of the Royal Astronomical Society 381 (1): 418–432. doi:10.1111/j.1365-2966.2007.12284.x. ISSN 0035-8711. Bibcode: 2007MNRAS.381..418H. 
  9. ↑ Hill, P. W. (1965). "The Spectrum of the 1962 Supernova in NGC 1313". Monthly Notices of the Royal Astronomical Society 131: 155–157. doi:10.1093/mnras/131.1.155. 
  10. ↑ "SN 1962M". IAU. https://www.wis-tns.org/object/1962M. 
  11. ↑ Dopita, M. A.; Ryder, S. D. (1990). "Nova in NGC 1313". International Astronomical Union Circular (4950): 3. Bibcode: 1990IAUC.4950....3D. 
  12. ↑ Ryder, Stuart; Staveley-Smith, Lister; Dopita, Michael; Petre, Robert; Colbert, Edward; Malin, David; Schlegel, Eric (1993). "SN 1978K: An Extraordinary Supernova in the Nearby Galaxy NGC 1313". The Astrophysical Journal 416: 167. doi:10.1086/173223. Bibcode: 1993ApJ...416..167R. 
  13. ↑ Materne, J. (April 1979). "The structure of nearby groups of galaxies - Quantitative membership probabilities". Astronomy and Astrophysics 74 (2): 235–243. Bibcode: 1979A&A....74..235M. 
  14. ↑ "VLT Image of Starburst Galaxy NGC 1313". European Southern Observatory. 23 November 2006. https://www.eso.org/public/news/eso0643/. 
  15. ↑ Suzuki (2013). "AKARI view of star formation in NGC 1313". Astronomy & Astrophysics 554: A8. doi:10.1051/0004-6361/201220294. Bibcode: 2013A&A...554A...8S. 
  16. ↑ "NGC 1313". Astrosurf. 22 October 2006. http://www.astrosurf.com/antilhue/ngc1313.htm. 
  17. ↑ "Tumult in NGC 1313" (in de). Wissenschaft.de. 28 November 2006. http://www.wissenschaft.de/home/-/journal_content/56/12054/1021067/. 
  18. ↑ "Hubble Sees Star Cluster "Infant Mortality"". NASA. 10 January 2007. http://hubblesite.org/newscenter/archive/releases/2007/05/image/c/. 
  19. ↑ Anne Pellerin; Martin Meyer; Jason Harris; Daniela Calzetti (2007). "Stellar Clusters in NGC 1313: Evidence of Infant Mortality". The Astrophysical Journal 653 (2): L87–L90. doi:10.1086/515437. Bibcode: 2007ApJ...658L..87P. 
  20. ↑ Mollá, Mercedes; Roy, Jean-René (1 April 1999). "Modeling the Radial Abundance Distribution of the Transition Galaxy NGC 1313". The Astrophysical Journal 514 (2): 781–786. doi:10.1086/306982. Bibcode: 1999ApJ...514..781M. 
  21. ↑ Matteo Bachetti (2013). "The Ultraluminous X-Ray Sources NGC 1313 X-1 and X-2: A Broadband Study with NuSTAR and XMM-Newton". The Astrophysical Journal 778 (2): 163. doi:10.1088/0004-637X/778/2/163. Bibcode: 2013ApJ...778..163B. 
  22. ↑ Dheeraj Pasham (2015). "Evidence for High-Frequency QPOs with a 3:2 Frequency Ratio from a 5000 Solar Mass Black Hole". The Astrophysical Journal 811 (1): L11. doi:10.1088/2041-8205/811/1/L11. Bibcode: 2015ApJ...811L..11P. 
  23. ↑ "Intermediate-Mass Black Hole 5,000 Times Mass of Sun". Sci-News.com. 23 September 2015. http://www.sci-news.com/astronomy/science-ngc1313x1-intermediate-mass-black-hole-03265.html. 



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