Astronomy:NGC 2903

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Short description: Spiral galaxy in the constellation Leo
NGC 2903
NGC 2903 GALEX.jpg
An ultraviolet image of NGC 2903 taken with GALEX.
Observation data (J2000 epoch)
ConstellationLeo
Right ascension 09h 32m 10.111s[1]
Declination+21° 30′ 02.99″[1]
Redshift556±1 km/s[2]
Distance30.4 Mly (9.33 Mpc)[3]
Group or clusterVirgo Supercluster[4]
Apparent magnitude (V)9.0[5]
Characteristics
TypeSBbc[6] or SAB(rs)bc[7]
Size100,000 ly (diameter)
Apparent size (V)11.48′ × 5.25′[8]
Other designations
UGC 5079, IRAS 09293+2143,[9] PGC 27077[2]

NGC 2903 is an isolated barred spiral galaxy in the equatorial constellation of Leo, positioned about 1.5° due south of Lambda Leonis.[10] It was discovered by German-born astronomer William Herschel, who cataloged it on November 16, 1784. He mistook it as a double nebula, as did subsequent observers, and it wasn't until the nineteenth century that the Third Earl of Rosse resolved into a spiral form.[5] J. L. E. Dreyer assigned it the identifiers 2903 and 2905 in his New General Catalogue; NGC 2905 now designates a luminous knot in the northeastern spiral arm.[11]

This field galaxy[12] is located about 30[3] million light-years away from the Milky Way, and is a member of the Virgo Supercluster.[4] The morphological classification of this galaxy is SBbc,[6] indicating a barred spiral (SB) with moderate to tightly-wound spiral arms (bc). De Vaucouleurs and associates assigned it the class SAB(rs)bc, suggesting a weaker bar structure (SAB) with a partial ring (rs). The bar structure appears stronger in the near infrared band. The galaxy as a whole is inclined by an angle of 60° to the line of sight from the Earth.[7]

72% of the stellar mass is located in the outer disk of the galaxy, and 20% is found in the bar. The bulge adds 5% of the stellar mass, and its star population is generally older.[13] However, the central ~650 pc radius volume of the core is a strong starburst region. The star formation rate here is 0.7 M☉ y−1 and it is being fed by gas inflow along the bar. There is no evidence of an active nucleus.[7]

The irregular dwarf galaxy KKH 51 appears to be a companion, as they have an angular separation of 25′ and nearly the same radial velocity.[14]

References

  1. ↑ 1.0 1.1 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S. 
  2. ↑ 2.0 2.1 "NASA/IPAC Extragalactic Database". Results for NGC 2903. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+2903&img_stamp=yes&extend=no. Retrieved 2006-11-25. 
  3. ↑ 3.0 3.1 Tully, R. Brent et al. (August 2016). "Cosmicflows-3". The Astronomical Journal 152 (2): 21. doi:10.3847/0004-6256/152/2/50. 50. Bibcode: 2016AJ....152...50T. 
  4. ↑ 4.0 4.1 "Nearby Groups of Galaxies". http://ned.ipac.caltech.edu/level5/Dev2/frames.html. 
  5. ↑ 5.0 5.1 O'Meara, Stephen James (2007). Hidden treasures. Cambridge University Press. p. 256. ISBN 9780521837040. https://books.google.com/books?id=a6VY0Q1zsJoC&pg=PA256. 
  6. ↑ 6.0 6.1 Ann, H. B. et al. (2015). "A Catalog of Visually Classified Galaxies in the Local (z ~ 0.01) Universe". The Astrophysical Journal Supplement Series 217 (2): 27–49. doi:10.1088/0067-0049/217/2/27. Bibcode: 2015ApJS..217...27A. 
  7. ↑ 7.0 7.1 7.2 Yukita, Mihoko et al. (October 2012). "Hot Diffuse Emission in the Nuclear Starburst Region of NGC 2903". The Astrophysical Journal 758 (2): 17. doi:10.1088/0004-637X/758/2/105. 105. Bibcode: 2012ApJ...758..105Y. 
  8. ↑ Paturel, G. et al. (December 2003). "HYPERLEDA. I. Identification and designation of galaxies". Astronomy and Astrophysics 412: 45–55. doi:10.1051/0004-6361:20031411. Bibcode: 2003A&A...412...45P. 
  9. ↑ "NGC 2903". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+2903. 
  10. ↑ Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. 2. Sky Publishing Corporation and the European Space Agency. p. 686. ISBN 0-933346-83-2. 
  11. ↑ Moore, S. L. et al. (April 2010). "NGC 2903 - the galaxy Messier missed". Journal of the British Astronomical Association 120 (2): 106–107. Bibcode: 2010JBAA..120..106M. 
  12. ↑ 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. 
  13. ↑ Carrillo, Andreia et al. (April 2020). "The VIRUS-P Exploration of Nearby Galaxies (VENGA): the stellar populations and assembly of NGC 2903's bulge, bar, and outer disc". Monthly Notices of the Royal Astronomical Society 493 (3): 4094–4106. doi:10.1093/mnras/staa397. Bibcode: 2020MNRAS.493.4094C. 
  14. ↑ Makarova, L. N. et al. (March 2002). "Surface photometry of new nearby dwarf galaxies". Astronomy and Astrophysics 384: 72–80. doi:10.1051/0004-6361:20020006. Bibcode: 2002A&A...384...72M. 

External links


Coordinates: Sky map 09h 32m 10.1s, +21° 30′ 03″



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