Astronomy:NGC 2139

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NGC 2139
Legacy Surveys DR10 image of NGC 2139
Observation data (J2000 epoch)
ConstellationLepus
Right ascension 06h 01m 07.963s[1]
Declination−23° 40′ 20.35″[1]
Redshift0.006148±0.000017[2]
Helio radial velocity1,836 km/s[3]
Galactocentric velocity1,649 km/s[3]
Distance120.6 Mly (36.98 Mpc)[3]
Apparent magnitude (V)11.6[4]
Apparent magnitude (B)11.98[3]
Characteristics
TypeSAB(rs)cd[5]
Number of stars9.1×109 M☉[5]
Apparent size (V)2.40′ × 1.9′[4]
Notable featuresBulgeless
Other designations
NGC 2139, IC 2154, MCG-04-15-005, PGC 18258[6]

NGC 2139 is a barred spiral galaxy in the constellation of Lepus.[4] It was discovered on November 17, 1784, by the German-English astronomer William Herschel.[7] The galaxy is located at a distance of 120.6 million light-years (36.98 Mpc) from the Sun and is receding with a radial velocity of 1,836 km/s.[3]

The overall form of this galaxy is irregular with spiral arms and the appearance of tidal features, suggesting a potential recent merger event. There is no central bulge of significance.[8] The morphological classification is SAB(rs)cd,[5] which indicates a barred spiral galaxy (SAB) with a transitional inner ring structure (rs) and loosely wound spiral arms (cd). It is a star forming galaxy with a formation rate of 3.8 M☉·yr−1.[5] There is a plume extending to the south of the galaxy.[8]

A luminous filament runs through the center of the galaxy, which includes a small nuclear cluster. This cluster is only 4.1×107 years old with a mass of 8.3×105 M☉.[8] It is offset at a distance of 320 pc from the center of the galaxy and may come to rest there on a time scale of around 100 million years.[9] The cluster is a source of X-ray emission.[10]

Supernovae

Three supernovae have been observed in NGC 2139:

  • Robert Evans and associates discovered SN 1995ad (Type II, mag. 14) on 28 September 1995.[11][12] It was positioned in one of the spiral arms, 25″ west and 5″ south of the NGC 2139 nucleus. The recession velocity was consistent with that of the host galaxy.[13]
  • SN 2022qhy (Type Ibn, mag. 15.889) was discovered by ATLAS on 1 August 2022.[14]
  • SN 2023zcu (Type II, mag. 19.054) was discovered by ATLAS on 8 December 2023.[15]

References

  1. ↑ 1.0 1.1 Skrutskie, Michael F. 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. ↑ De Vaucouleurs, Gerard et al. (1991), Third Reference Catalogue of Bright Galaxies, Bibcode: 1991rc3..book.....D. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 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 4.2 Frommert, Hartmut, Revised NGC Data for NGC 2139, Students for the Exploration and Development of Space, https://spider.seds.org/ngc/revngcic.cgi?NGC%202139, retrieved 2024-03-07. 
  5. ↑ 5.0 5.1 5.2 5.3 Mineo, S. et al. (November 1, 2012), "X-ray emission from star-forming galaxies - II. Hot interstellar medium", Monthly Notices of the Royal Astronomical Society 426 (3): 1870–1883, doi:10.1111/j.1365-2966.2012.21831.x, Bibcode: 2012MNRAS.426.1870M. 
  6. ↑ "NGC 2139". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+2139. 
  7. ↑ Seligman, Courtney, "NGC Objects: NGC 2100 - 2149", Celestial Atlas, https://cseligman.com/text/atlas/ngc21.htm#2139, retrieved 2024-03-07. 
  8. ↑ 8.0 8.1 8.2 Shields, Joseph C. et al. (July 2012), "Chandra Observations of the Nuclear Star Cluster and Ultraluminous X-Ray Sources in NGC 2139", The Astronomical Journal 144 (1): id. 12, doi:10.1088/0004-6256/144/1/12, Bibcode: 2012AJ....144...12S. 
  9. ↑ Andersen, David R. et al. (December 2008), "Caught in Formation: The Nuclear-Cluster-to-Be in NGC 2139", The Astrophysical Journal 688 (2): 990–999, doi:10.1086/592342, Bibcode: 2008ApJ...688..990A. 
  10. ↑ Shields, J. et al. (2010), X-ray Properties of Star Clusters in NGC 2139, European Southern Observatory, https://www.eso.org/sci/meetings/2010/cmo2010/Presentations/Day2/shields_eso2010.pdf, retrieved 2024-03-07. 
  11. ↑ "SN 1995ad". IAU. https://www.wis-.tns.org/object/1995ad. 
  12. ↑ Evans, R. et al. (September 1995), Green, D. W. E., ed., "Supernova 1995ad in NGC 2139", IAU Circular (6239): 1, Bibcode: 1995IAUC.6239....1E. 
  13. ↑ Inserra, C. et al. (July 2013), "Moderately luminous Type II supernovae", Astronomy & Astrophysics 555: id. A142, doi:10.1051/0004-6361/201220496, Bibcode: 2013A&A...555A.142I. 
  14. ↑ "SN 2022qhy". IAU. https://www.wis-.tns.org/object/2022qhy. 
  15. ↑ "SN 2023zcu". IAU. https://www.wis-.tns.org/object/2023zcu. 

Template:NGC objects:2000-2499



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