NGC 3184 explained

NGC 3184
Type:SA(s)b: II
Z:0.001975[1]
Dist Ly:39.8 ± 12 Mly
[2]
Appmag V:10.4
Size V:7.4 × 6.9
Constellation Name:Ursa Major
Names:UGC 5557, PGC 30087

NGC 3184, the Little Pinwheel Galaxy, is a spiral galaxy approximately 40 million light-years away[2] in the constellation Ursa Major. Its name comes from its resemblance to the Pinwheel Galaxy. It was discovered on 18 March 1787 by German-British astronomer William Herschel.[3] It has two HII regions named NGC 3180[4] and NGC 3181.[5]

NGC 3184 houses a high abundance of heavy elements. The blue color of its spiral arms comes mostly from relatively few bright young blue stars. The bright stars that highlight the arms were created in huge density waves that circle the center.

Structure

NGC 3184 has two prominent spiral arms. They have constant pitch angles, which makes them both symmetrical.[6]

Supernovae and Astronomical Transients

Seven supernovae and astronomical transients have been observed in NGC 3184: SN 1921B (type unknown, mag. 13.5),[7] 1921C (type unknown, mag. 11),[8] SN 1937F (type unknown, mag. 13.5),[9] SN 1999gi (type II, mag. 14),[10] [11] [12] SN 2010dn (type ILRT, mag. 17),[13] SN 2016bkv (type II, mag. 17.2),[14] and AT 2019sfe (type unknown, mag. 20.6).[15] [16]

SN 2010dn

On May 31, 2010, Kōichi Itagaki detected a magnitude 17 optical transient 33" east and 61" north of the center of NGC 3184 at coordinates 10 18 19.89 +41 26 28.8.[17] This event was initially thought to be an outbursting luminous blue variable (LBV) star,[18] but later analysis categorized it as an intermediate-luminosity red transient (ILRT), also known as a luminous red nova.[19] [20] Archival Hubble and Spitzer images of NGC 3184 seem to show no progenitor for optical transient SN 2010dn.[21] SN 2010dn is just like SN 2008S and NGC 300-OT.[18] On day 2, SN 2010dn had an unfiltered magnitude of 17.1, corresponding to a peak absolute magnitude of roughly -13.3.[18]

Astronomical Transients in NGC 3184! Name! apmag! type
SN 1921B 13.5 ?
SN 1921C 11.0 ?
SN 1937F 13.5 ?
SN 1999gi 14.0 II
SN 2010dn 17.2 ILRT
SN 2016bkv 17.2 II
AT 2019sfe 20.6 ?
Galaxies with several Supernovae! Galaxy! number! Declination
Arp 299 (NGC 3690 + IC 694) 14 +58
NGC 6946 (Fireworks) 10 +60
8 +04
7 +15
NGC 3184 7 +41
Messier 83 (Southern Pinwheel) 6 −29
6 −21
6 +85
5 +12
Messier 101 (Pinwheel) 5 +54
5 −09

See also

External links

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 3184 . 2010-06-01.
  2. Web site: Distance Results for NGC 3184 . NASA/IPAC Extragalactic Database . 2010-06-01.
  3. Web site: NGC 3184 . Seligman . Courtney . Celestial Atlas . 8 August 2024 .
  4. Web site: NASA/IPAC Extragalactic Database . Results for NGC 3180 . 2010-06-02.
  5. Web site: NASA/IPAC Extragalactic Database . Results for NGC 3181 . 2010-06-02.
  6. Honig . Z.N. . Reid . M.J. . Characteristics of Spiral Arms in Late-type Galaxies . The Astrophysical Journal . February 2015 . 800 . 1 . 5387–5394 . 10.1088/0004-637X/800/1/53 . 53 . November 10, 2022. 1412.1012 . 2015ApJ...800...53H . 118666575 .
  7. Web site: Transient Name Server . SN 1921B . . 16 August 2024.
  8. Web site: Transient Name Server . SN 1921C . . 16 August 2024.
  9. Web site: Transient Name Server . SN 1937F . . 16 August 2024.
  10. Web site: Transient Name Server . SN 1999gi . . 16 August 2024.
  11. Web site: 1999-12-10 . Supernova 1999gi in NGC 3184 (Circular No. 7329) . Central Bureau for Astronomical Telegrams . Daniel W. E. Green . 2010-06-02.
  12. Web site: 1999gi (main page) . supernovae.net (International Supernovae Network) . David Bishop . 2010-06-02.
  13. Web site: Transient Name Server . SN 2010dn . . 16 August 2024.
  14. Web site: Transient Name Server . SN 2016bkv . . 16 August 2024.
  15. Web site: Transient Name Server . AT 2019sfe . . 16 August 2024.
  16. https://www.rochesterastronomy.org/sn2019/index.html#2019sfe 2019sfe
  17. Web site: Latest Supernovae . supernovae.net (International Supernovae Network) . David Bishop . 2010-06-02.
  18. Smith . Nathan . Weidong . Li . Silverman . Jeffrey . Ganeshalingam . Mo . Filippenko . Alexei . Alexei Filippenko . Luminous Blue Variable eruptions and related transients: Diversity of progenitors and outburst properties . Monthly Notices of the Royal Astronomical Society . 2010 . 1010.3718 . 2011MNRAS.415..773S . 10.1111/j.1365-2966.2011.18763.x . 415 . 1 . 773–810. free . 85440811 .
  19. Cai . Y.-Z. . Intermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosions . 2021 . Astronomy & Astrophysics . 654 . A157 . 10.1051/0004-6361/202141078. 2108.05087 . 2021A&A...654A.157C .
  20. Web site: Transient Name Server . AT 2010dn. . 16 August 2024.
  21. Web site: 2010-06-01 . ATEL 2655: HST/Spitzer limits on the progenitor of SN2010dn in NGC3184 . Astronomers Telegram . 2010-06-01.

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