NGC 5530 is a spiral galaxy located in the constellation Lupus. It is located at a distance of about 40 million light years from Earth, which, given its apparent dimensions, means that NGC 5530 is about 60,000 light years across.[1] It was discovered by John Herschel on April 7, 1837.[3]

NGC 5530 has a flocculent spiral pattern, with multiple spiral arms and spiral fragments with many knots.[4][5] Dust lanes associated with spiral arms are visible across the disk.[4] The galaxy has a small nucleus[4] with a magnitude 13 field star superimposed. In H-alpha images some faint HII regions are visible, but are hard to distinguish among the starry field.[6] In blue filter the galaxy has an inner pseudoring which has a diameter of 4.6 kpc and accounts for 14% of the total H-alpha emission of the galaxy. The star formation rate of the galaxy is estimated to be 1.0±0.4 M☉ based on H-alpha emission.[7] In the nucleus lies a nuclear star cluster which has a radius of 2.6 arcseconds.[8]

NGC 5530 is a member of the NGC 5643 Group, named after NGC 5643.[9]

Supernova

One supernova has been discovered in NGC 5530, SN 2007it. It was discovered visually by Robert Evans on 13 September 2007 at an apparent magnitude of 13.5, lying 24" west and 25" north of the nucleus.[10] It was determined spectrographically as a young type II supernova.[11] Further observations lead to its IIP categorisation. There are indications that dust was formed during the supernova, as well as of a light echo. The progenitor star had an estimated mass of 16–27 M☉.[12] A search of archival photographs revealed several taken by the All Sky Automated Survey, including one taken on 6 September 2007.[13] In this image, it was magnitude 12, making SN 2007it the brightest supernova of the year 2007.[14]

References

  1. ^ a b c d e f g h i j "Results for object NGC 5530". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 5 March 2025.
  2. ^ "Revised NGC Data for NGC 5530". spider.seds.org. Retrieved 25 November 2018.
  3. ^ Seligman, Courtney. "NGC 5530". Celestial Atlas. Retrieved 19 November 2018.
  4. ^ a b c Sandage, A., Bedke, J. (1994), The Carnegie Atlas of Galaxies. Volume I, Carnegie Institution of Washington
  5. ^ Corwin, H. G.; de Vaucouleurs, A.; de Vaucouleurs, G (1985) Southern Galaxy Catalogue. University of Texas
  6. ^ Ryder, Stuart D.; Dopita, Michael A. (October 1993). "An H-alpha atlas of nearby southern spiral galaxies". The Astrophysical Journal Supplement Series. 88: 415. doi:10.1086/191827.
  7. ^ Grouchy, R. D.; Buta, R. J.; Salo, H.; Laurikainen, E. (1 June 2010). "RING STAR FORMATION RATES IN BARRED AND NONBARRED GALAXIES". The Astronomical Journal. 139 (6): 2465–2493. doi:10.1088/0004-6256/139/6/2465.
  8. ^ Georgiev, Iskren Y.; Böker, Torsten; Leigh, Nathan; Lützgendorf, Nora; Neumayer, Nadine (1 April 2016). "Masses and scaling relations for nuclear star clusters, and their co-existence with central black holes". Monthly Notices of the Royal Astronomical Society. 457 (2): 2122–2138. doi:10.1093/mnras/stw093.
  9. ^ Makarov, Dmitry; Karachentsev, Igor (21 April 2011). "Galaxy groups and clouds in the local (z~ 0.01) Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. arXiv:1011.6277. Bibcode:2011MNRAS.412.2498M. doi:10.1111/j.1365-2966.2010.18071.x. S2CID 119194025. Retrieved 1 February 2025.
  10. ^ Green, Daniel (27 September 2007). "V5558 Sgr; 2007gw-2007kd". International Astronomical Union Circular. 8874.
  11. ^ Contreras, C.; Morrell, N.; Gonzalez, S.; Lee, K. -G. (15 September 2007). "Supernova 2007it in NGC 5530". Central Bureau Electronic Telegrams. 1068: 1.
  12. ^ Andrews, J. E.; Sugerman, B. E. K.; Clayton, Geoffrey C.; Gallagher, J. S.; Barlow, M. J.; Clem, J.; Ercolano, B.; Fabbri, J.; Meixner, M.; Otsuka, M.; Welch, D. L.; Wesson, R. (10 April 2011). "PHOTOMETRIC AND SPECTROSCOPIC EVOLUTION OF THE IIP SN 2007it TO DAY 944". The Astrophysical Journal. 731 (1): 47. doi:10.1088/0004-637X/731/1/47.
  13. ^ Pojmanski, G. (2007). "Supernovae 2007gw-2007kd". International Astronomical Union Circular. Bibcode:2007IAUC.8875....1P.
  14. ^ Bishop, David. "Bright Supernovae - 2007". Rochester Astronomy. Retrieved 5 March 2025.
Allikas: http://en.wikipedia.org/wiki/NGC_5530
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