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'''NGC 3938''' is an [[unbarred spiral galaxy]] in the [[Ursa Major]] constellation. It was discovered on 6 February 1788 by [[William Herschel]]. It is one of the brightest spiral galaxies in the Ursa Major South galaxy group, and is roughly 67,000 light years in diameter.<ref name=aotu>{{cite web |url=http://www.atlasoftheuniverse.com/galgrps/uma.html |title=The Ursa Major Groups |author= |publisher=Atlas of the Universe |accessdate= 30 December 2011}}</ref> It is approximately 43 million [[light year]]s away from [[Earth]].<ref name=kopernik/> NGC 3938 is classified as type Sc under the [[Hubble sequence]], a loosely wound spiral galaxy with a smaller and dimmer bulge.<ref name="Kruit">{{cite journal | last1 = van der Kruit | first1 = P.C. | last2 = Shostak | first2 = G.S. | authorlink = | title = Studies of Nearly Face-on Spiral Galaxies| journal = Astronomy and Astrophysics| volume = 105| issue = | pages = 351–358| date = 1982| language = | url = http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1982A%26A...105..351V&amp;data_type=PDF_HIGH&amp;whole_paper=YES&amp;type=PRINTER&amp;filetype=.pdf| bibcode = 1982A&A...105..351V | doi = | id = | mr = | zbl = | jfm = | accessdate = 25 June 2014 }}</ref> The spiral arms of the galaxy contain many areas of [[H II region|ionized atomic hydrogen]] gas, more so towards the center.<ref>{{cite journal | last = Jiménez-Vicente| first = J.| authorlink = |display-authors=4 |author2=E. Battaner |author3=M. Rozas |author4=H. Castañeda |author5=C. Porcel | title = Fabry-Perot observations of the ionized gas in NGC 3938| journal = Astronomy and Astrophysics| volume = 342| issue = | pages = 417–425| date = 1999| language = | url = http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1999A%26A...342..417J&amp;data_type=PDF_HIGH&amp;whole_paper=YES&amp;type=PRINTER&amp;filetype=.pdf| jstor = | issn = | doi = | bibcode = 1999A&A...342..417J | accessdate = 25 June 2014 |arxiv = astro-ph/9811391 }}</ref>
'''NGC 3938''' is an [[unbarred spiral galaxy]] in the [[Ursa Major]] constellation. It was discovered on 6 February 1788 by [[William Herschel]]. It is one of the brightest spiral galaxies in the Ursa Major South galaxy group, and is roughly 67,000 light years in diameter.<ref name=aotu>{{cite web |url=http://www.atlasoftheuniverse.com/galgrps/uma.html |title=The Ursa Major Groups |author= |publisher=Atlas of the Universe |accessdate= 30 December 2011}}</ref> It is approximately 43 million [[light year]]s away from [[Earth]].<ref name=kopernik/> NGC 3938 is classified as type Sc under the [[Hubble sequence]], a loosely wound spiral galaxy with a smaller and dimmer bulge.<ref name="Kruit">{{cite journal | last1 = van der Kruit | first1 = P.C. | last2 = Shostak | first2 = G.S. | authorlink = | title = Studies of Nearly Face-on Spiral Galaxies| journal = Astronomy and Astrophysics| volume = 105| issue = | pages = 351–358| date = 1982| language = | url = http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1982A%26A...105..351V&amp;data_type=PDF_HIGH&amp;whole_paper=YES&amp;type=PRINTER&amp;filetype=.pdf| bibcode = 1982A&A...105..351V | doi = | id = | mr = | zbl = | jfm = | accessdate = 25 June 2014 }}</ref> The spiral arms of the galaxy contain many areas of [[H II region|ionized atomic hydrogen]] gas, more so towards the center.<ref>{{cite journal | last = Jiménez-Vicente| first = J.| authorlink = |display-authors=4 |author2=E. Battaner |author3=M. Rozas |author4=H. Castañeda |author5=C. Porcel | title = Fabry-Perot observations of the ionized gas in NGC 3938| journal = Astronomy and Astrophysics| volume = 342| issue = | pages = 417–425| date = 1999| language = | url = http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1999A%26A...342..417J&amp;data_type=PDF_HIGH&amp;whole_paper=YES&amp;type=PRINTER&amp;filetype=.pdf| jstor = | issn = | doi = | bibcode = 1999A&A...342..417J | accessdate = 25 June 2014 |arxiv = astro-ph/9811391 }}</ref>


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== External links ==
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{{Use dmy dates|date=March 2012}}


Revision as of 05:00, 29 November 2019

NGC 3938
Observation data (2000 epoch)
ConstellationUrsa Major[1]
Right ascension11h 52m 42.9s[1]
Declination+44° 07′ 17″[1]
Distance43 Million light years
Apparent magnitude (V)10.9[1]
Characteristics
TypeSA(s)c
Apparent size (V)5′.4 × 4′.9[1]

NGC 3938 is an unbarred spiral galaxy in the Ursa Major constellation. It was discovered on 6 February 1788 by William Herschel. It is one of the brightest spiral galaxies in the Ursa Major South galaxy group, and is roughly 67,000 light years in diameter.[2] It is approximately 43 million light years away from Earth.[1] NGC 3938 is classified as type Sc under the Hubble sequence, a loosely wound spiral galaxy with a smaller and dimmer bulge.[3] The spiral arms of the galaxy contain many areas of ionized atomic hydrogen gas, more so towards the center.[4]

Supernovae

Two supernovae have been identified within NGC 3938. SN 2005ay is a type II supernova that was discovered on 27 March 2005 and had a magnitude of 15.6.[5] SN 2017ein is a type Ic supernova that was discovered on 25 May 2017 and peaked at magnitude 14.9.[6]

  • Artist's impression of progenitor star to a type Ic supernova in NGC 3938.[7]
    Artist's impression of progenitor star to a type Ic supernova in NGC 3938.[7]
  • Spiral galaxy NGC 3938, by HST. Location of SN 2005ay remnant is marked.
    Spiral galaxy NGC 3938, by HST. 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, by HST.

References

  1. ^ a b c d e f George Normandin (5 May 2005). "Spiral Galaxy NGC 3839". kopernik.org. Retrieved 30 December 2011.
  2. ^ "The Ursa Major Groups". Atlas of the Universe. Retrieved 30 December 2011.
  3. ^ 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. Retrieved 25 June 2014.
  4. ^ 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. Retrieved 25 June 2014.
  5. ^ "Supernova 2005ay in NGC 3938". Rochester Astronomy. Retrieved 29 January 2013.
  6. ^ "Supernovae 2017ein in NGC 3938". www.rochesterastronomy.org. Retrieved 29 June 2017.
  7. ^ "Artist's impression of progenitor star to a type Ic supernova". www.spacetelescope.org. Retrieved 20 November 2018.
  • Media related to NGC 3938 at Wikimedia Commons



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