NGC 3184

NGC 3184, the Little Pinwheel Galaxy, is a spiral galaxy approximately 40 million light-years away[2] in the constellation Ursa Major. It has two HII regions named NGC 3180[3] and NGC 3181.[4]

NGC 3184
NGC 3184 as observed with the Spitzer Space Telescope, as part of the Spitzer Infrared Nearby Galaxy Survey. The blue colors represent the 3.6 micrometre emission from stars. The green and red colors represent the 5.8 and 8.0 micrometre emission from polycyclic aromatic hydrocarbons and possibly dustright
.
Observation data (J2000 epoch)
ConstellationUrsa Major
Right ascension10h 18m 17.0s[1]
Declination+41° 25′ 28″[1]
Redshift0.001975[1]
Heliocentric radial velocity592 ± 1 km/s[1]
Distance39.8 ± 12 Mly
(12.2 ± 3.7 Mpc)[2]
Apparent magnitude (V)10.4[1]
Characteristics
TypeSA(s)b: II
Apparent size (V)7.4′ × 6.9′
Other designations
UGC 5557, PGC 30087

NGC 3184 houses a high abundance of heavy elements and SN 1999gi, a magnitude 14 Type II supernova detected on December 9, 1999.[5][6] Other supernovae in NGC 3184 include 1921B (mag 13.5), 1921C (mag 11) and 1937F (mag 13.5).[6]

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.[7]

SN 2010dn

On May 31, 2010, Koichi 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.[8] This event may be an outbursting luminous blue variable (LBV) star.[9] Archival Hubble and Spitzer images of NGC 3184 seem to show no progenitor for optical transient SN 2010dn.[10] SN 2010dn is just like SN 2008S and NGC 300-OT.[9] On day 2, SN 2010dn had an unfiltered magnitude of 17.1, corresponding to a peak absolute magnitude of roughly -13.3.[9]

Supernovae in NGC 3184[11]
Supernova apmag type
AT2019sfe20.6 ?
2016bkv14.8II
2010dn17.2LBV
1999gi14.0II
1937F13.5 ?
1921C11.0 ?
1921B13.5 ?
NGC 3184 showing supernova impostor 2010dn on June 02, 2010
Galaxies with several Supernovae
Galaxy number Declination
NGC 6946 (Fireworks)10+60
Arp 299 (NGC 3690 + IC 694)9+58
Messier 618+04
Messier 1007+15
NGC 31847+41
Messier 83 (Southern Pinwheel)6−29
NGC 2207 and IC 21636−21
NGC 22766+85
Messier 665+12
Messier 101 (Pinwheel)5+54
NGC 3095−09

See also

References
  1. "NASA/IPAC Extragalactic Database". Results for NGC 3184. Retrieved 2010-06-01.
  2. "Distance Results for NGC 3184". NASA/IPAC Extragalactic Database. Retrieved 2010-06-01.
  3. "NASA/IPAC Extragalactic Database". Results for NGC 3180. Retrieved 2010-06-02.
  4. "NASA/IPAC Extragalactic Database". Results for NGC 3181. Retrieved 2010-06-02.
  5. Daniel W. E. Green (1999-12-10). "Supernova 1999gi in NGC 3184 (Circular No. 7329)". Central Bureau for Astronomical Telegrams. Retrieved 2010-06-02.
  6. David Bishop. "1999gi (main page)". supernovae.net (International Supernovae Network). Retrieved 2010-06-02.
  7. Honig, Z.N.; Reid, M.J. (February 2015). "Characteristics of Spiral Arms in Late-type Galaxies". The Astrophysical Journal. 800 (1): 5387–5394. arXiv:1412.1012. Bibcode:2015ApJ...800...53H. doi:10.1088/0004-637X/800/1/53. PMID 53. S2CID 118666575. Retrieved November 10, 2022.
  8. David Bishop. "Latest Supernovae". supernovae.net (International Supernovae Network). Retrieved 2010-06-02.
  9. Smith, Nathan; Weidong, Li; Silverman, Jeffrey; Ganeshalingam, Mo; Filippenko, Alexei (2010). "Luminous Blue Variable eruptions and related transients: Diversity of progenitors and outburst properties". Monthly Notices of the Royal Astronomical Society. 415 (1): 773–810. arXiv:1010.3718. Bibcode:2011MNRAS.415..773S. doi:10.1111/j.1365-2966.2011.18763.x. S2CID 85440811.
  10. "ATEL 2655: HST/Spitzer limits on the progenitor of SN2010dn in NGC3184". Astronomers Telegram. 2010-06-01. Retrieved 2010-06-01.
  11. 2019sfe in NGC 3184 (David Bishop)
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