IC 4182 is aMagellanic spiral galaxy in the constellationCanes Venatici. The galaxy lies about 14 millionlight years away from Earth, which means, given its apparent dimensions, that IC 4182 is approximately 28,000 light years across.[1] It was discovered by German astronomerMax Wolf on 21 March 1903.[3][2]
IC 4182 is seen nearly face-on. It has a low surface brightness disk with patch of star formation and no spiral pattern.[4] The galaxy is close enough for its brightest stars to be resolvable through large telescopes, having a photometric blue filter apparent magnitude of 19.2,[5] and a visual magnitude of around 20 for the brightest blue stars and around 21 for the brightest red stars.[6] The density ofultraviolet sources decreases monotonically with radius.[7]
The galaxy is considered to be a member of theM94 Group,[8] while Garcia considered the galaxy to be a member of theLGG 334 group, along withNGC 5005 andNGC 5033.[9]
Alight curve for SN 1937C, plotted from data published by Baade & Zwicky (1938)[5]
Onesupernova has been observed in IC 4182:SN1937C (Type Ia, mag. 8.4) was discovered byFritz Zwicky on 24 August 1937.[10][11] The supernova was located 30 arcseconds north and 40 arcseconds east of the nucleus,[2] and was a few days post maximum.[5] The peak apparent B-magnitude was estimated to have been 8.7.[12]
The galaxy was observed repeatedly by theHubble Space Telescope in 1992, leading to the discovery ofCepheid variable stars within it. SN1937C then became the first Type Ia supernova to have its distance calibrated with Cepheid stars, and then used asstandard candles to calculate theHubble constant.[13]
^Eskridge, Paul B.; Frogel, Jay A.; Pogge, Richard W.; Quillen, Alice C.; Berlind, Andreas A.; Davies, Roger L.; DePoy, D. L.; Gilbert, Karoline M.; Houdashelt, Mark L.; Kuchinski, Leslie E.; Ramirez, Solange V.; Sellgren, K.; Stutz, Amelia; Terndrup, Donald M.; Tiede, Glenn P. (November 2002). "Near-Infrared and Optical Morphology of Spiral Galaxies".The Astrophysical Journal Supplement Series.143 (1):73–111.arXiv:astro-ph/0206320.Bibcode:2002ApJS..143...73E.doi:10.1086/342340.
^abcBaade, W.; Zwicky, F. (November 1938). "Photographic Light-Curves of the Two Supernovae in IC 4182 and NGC 1003".The Astrophysical Journal.88: 411.Bibcode:1938ApJ....88..411B.doi:10.1086/143996.
^Sandage, Allan; Carlson, George; Kristian, Jerome; Saha, Abhijit; Labhardt, Lukas (May 1996). "The Brightest Stars in Nearby Galaxies IX: Comparison of Ground-Based and HST Phtotmetry of the Brightest Stars in IC 4182".The Astronomical Journal.111: 1872.Bibcode:1996AJ....111.1872S.doi:10.1086/117925.
^"SN 1937C".Transient Name Server.IAU. Retrieved25 September 2024.
^Shapley, Harlow; Zwicky, Fritz (31 August 1937)."Supernova".Central Bureau for Astronomical Telegrams.680. Copenhagen Observatory,IAU: 1. Retrieved19 August 2025.
^Schaefer, Bradley E. (May 1994). "The peak brightness of SN 1937C in IC 4182 and the Hubble constant".The Astrophysical Journal.426: 493.Bibcode:1994ApJ...426..493S.doi:10.1086/174085.
^Saha, A.; Labhardt, Lukas; Schwengeler, Hans; Macchetto, F. D.; Panagia, N.; Sandage, Allan; Tammann, G. A. (April 1994). "Discovery of Cepheids in IC 4182: Absolute peak brightness of SN IA 1937C and the value of H[SUB]0[/SUB]".The Astrophysical Journal.425: 14.Bibcode:1994ApJ...425...14S.doi:10.1086/173957.
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