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NGC 3938

From Wikipedia, the free encyclopedia
Galaxy in the constellation Ursa Major

NGC 3938
NGC 3938 imaged by Mount Lemmon SkyCenter of theUniversity of Arizona
Observation data (J2000epoch)
ConstellationUrsa Major[1]
Right ascension11h 52m 42.9s[1]
Declination+44° 07′ 17″[1]
Distance43 Mly
Apparent magnitude (V)10.9[1]
Characteristics
TypeSA(s)c[2]
Apparent size (V)5.4′ × 4.9′[1]
Other designations
UGC 6856,MCG +07-25-001,PGC 37229[2]

NGC 3938 is anunbarred spiral galaxy in theUrsa Major constellation. It was discovered on 6 February 1788 byWilliam Herschel. It is one of the brightest spiral galaxies in the Ursa Major South galaxy group and is roughly 67,000light years in diameter.[3] It is approximately 43 million light years away fromEarth.[1] NGC 3938 is classified as type Sc under theHubble sequence, a loosely wound spiral galaxy with a smaller and dimmer bulge.[4] The spiral arms of the galaxy contain many areas ofionized atomic hydrogen gas, more so towards the center.[5]

Supernovae

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Fivesupernovae have been identified within NGC 3938.

  • SN 1961U (type II, mag. 13.7) was discovered byPaul Wild on 28 December 1961.[6][7] [Note: some sources incorrectly list the discovery date as 2 January 1962.]
  • SN 1964L (type Ic, mag. 13.3) was discovered by Paul Wild on 11 December 1964.[8][9]
  • SN 2005ay (type II, mag. 15.6) was discovered byDoug Rich on 27 March 2005.[10][11]
  • SN 2017ein (type Ic, mag. 17.6) was discovered by Ron Arbour on 25 May 2017 and peaked at magnitude 14.9.[12][13] Images taken before the explosion point to a progenitor mass between ~47-48M☉, if it was in a single star system, and ~60-80M☉, if it was in abinary star system.[14]
  • SN 2022xlp (type Ia, mag. 17) was discovered byKōichi Itagaki on 13 October 2022.[15]

Gallery

[edit]
  • Artist's impression of progenitor star to a type Ic supernova in NGC 3938.[16]
    Artist's impression of progenitor star to a type Ic supernova in NGC 3938.[16]
  • Spiral galaxy NGC 3938, by HST. Location of SN 2005ay remnant is marked.
    Spiral galaxy NGC 3938, byHST. Location of SN 2005ay remnant is marked.
  • NGC 3938 with supernova SN 2005ay
    NGC 3938 with supernova SN 2005ay
  • The location of SN 2017ein, by HST.
    The location of SN 2017ein, byHST.
  • NGC 3938 by the Sloan Digital Sky Survey

References

[edit]
  1. ^abcdefGeorge Normandin (5 May 2005)."Spiral Galaxy NGC 3839". kopernik.org. Retrieved30 December 2011.
  2. ^ab"Results for object NGC 3938 (NGC 3938)".NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved28 February 2021.
  3. ^"The Ursa Major Groups". Atlas of the Universe. Retrieved30 December 2011.
  4. ^van der Kruit, P.C.; Shostak, G.S. (1982)."Studies of Nearly Face-on Spiral Galaxies"(PDF).Astronomy and Astrophysics.105:351–358.Bibcode:1982A&A...105..351V. Retrieved25 June 2014.
  5. ^Jiménez-Vicente, J.; E. Battaner; M. Rozas; H. Castañeda; et al. (1999)."Fabry-Perot observations of the ionized gas in NGC 3938"(PDF).Astronomy and Astrophysics.342:417–425.arXiv:astro-ph/9811391.Bibcode:1999A&A...342..417J.
  6. ^"SN 1961U".Transient Name Server.IAU. Retrieved27 November 2024.
  7. ^Thernoe, K. A. (4 January 1962)."Circular No. 1787 (sides 2 and 3)".Central Bureau for Astronomical Telegrams. Observatory Copenhagen. Retrieved27 November 2024.
  8. ^"SN 1964L".Transient Name Server.IAU. Retrieved27 November 2024.
  9. ^Thernoe, K. A. (29 December 1964)."Circular No. 1882 (side 1)".Central Bureau for Astronomical Telegrams. Observatory Copenhagen. Retrieved27 November 2024.
  10. ^"Supernova 2005ay in NGC 3938".Rochester Astronomy. Retrieved29 January 2013.
  11. ^"SN 2005ay".Transient Name Server.IAU. Retrieved27 November 2024.
  12. ^"SN 2017ein".Transient Name Server.IAU. Retrieved27 November 2024.
  13. ^"Supernovae 2017ein in NGC 3938".www.rochesterastronomy.org. Retrieved29 June 2017.
  14. ^Van Dyk, Schuyler; et al. (15 July 2018)."SN 2017ein and the Possible First Identification of a Type Ic Supernova Progenitor".The Astrophysical Journal.860 (2): 90.arXiv:1803.01050.Bibcode:2018ApJ...860...90V.doi:10.3847/1538-4357/aac32c.hdl:10150/628570.S2CID 56265423.
  15. ^"SN 2022xlp".Transient Name Server.IAU. Retrieved27 November 2024.
  16. ^"Artist's impression of progenitor star to a type Ic supernova".www.spacetelescope.org. Retrieved20 November 2018.

External links

[edit]
  • Media related toNGC 3938 at Wikimedia Commons


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