NGC 4527 is anintermediate spiral galaxy similar to theAndromeda Galaxy[4] and is located at a distance not well determined, but usually is considered to be an outlying member of theVirgo Cluster of galaxies,[5] being placed within the subcluster known asS Cloud.[6]
Unlike the Andromeda Galaxy, NGC 4527 is also astarburst galaxy, with 2.5 billionsolar masses ofmolecular hydrogen concentrated within its innermost regions.[7] However said starburst is still weak and seems to be on its earliest phases.[7]
SN 1915A (type unknown, mag. 15.5) was discovered byHeber Curtis on 20 March 1915.[8][9][10]
SN 1991T (Type Ia-pec, mag. 13) was discovered by Stephen Knight on 13 April 1991, and independently reported byRobert Evans, Mirko Villi, Giancarlo Cortini, and Wayne Johnson.[11][12] This supernova has been studied extensively as a peculiar and overluminous Type Ia, and is now used as a template, with similar events being classified asType Ia-91T-like.[13][14]
^Shapley, Harlow (1917). "A Faint Nova in the Nebula of Andromeda".Publications of the Astronomical Society of the Pacific.29 (171):213–217.Bibcode:1917PASP...29Q.213S.doi:10.1086/122669.
^Waagen, E.; Evans, R. O.; Villi, M.; Cortini, G.; Johnson, W.; McNaught, R. H.; Mueller, J.; Cappellaro, E.; Cutispoto, G.; La Franca, F.; Goldschmidt, C.; Kirshner, R. P.; Peters, J. (1991). "Supernova 1991T in NGC 4527".International Astronomical Union Circular (5239): 1.Bibcode:1991IAUC.5239....1W.
^"SN1991T".Transient Name Server.IAU. Retrieved6 December 2024.
^Lira, P.; Suntzeff, Nicholas B.; Phillips, M. M.; Hamuy, Mario; Maza, José; Schommer, R. A.; Smith, R. C.; Wells, Lisa A.; Avilés, R.; Baldwin, J. A.; Elias, J. H.; González, L.; Layden, A.; Navarrete, M.; Ugarte, P.; Walker, Alistair R.; Williger, Gerard M.; Baganoff, F. K.; Crotts, Arlin P. S.; Rich, R. Michael; Tyson, N. D.; Dey, A.; Guhathakurta, P.; Hibbard, J.; Kim, Y. -C.; Rehner, Daniel M.; Siciliano, E.; Roth, Joshua; Seitzer, Patrick; Williams, T. B. (1998). "Optical Light Curves of the Type IA Supernovae SN 1990N and SN 1991T".The Astronomical Journal.115 (1): 234.arXiv:astro-ph/9709262.Bibcode:1998AJ....115..234L.doi:10.1086/300175.
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