Perets, Hagai B. and Gal-Yam, Avishay and Crockett, R. Mark. and Anderson, Joseph P. and James, Phil A. and Sullivan, Mark and Neill, James D. and Leonard, Douglas C. (2011) The Old Environment of the Faint Calcium-rich Supernova SN 2005cz. Astrophysical Journal Letters, 728 (2). Art. No. L36. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20110322-130425655
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The supernova SN 2005cz has recently attracted some attention due to the fact that it was spectroscopically similar to type Ib supernovae (SNe Ib), a class that is presumed to result from the core collapse of massive stars, yet it occurred in an elliptical galaxy, where one expects very few massive stars to exist. Two explanations for this remarkable event were put forward. Perets et al. associate SN 2005cz with the class of Ca-rich, faint SNe Ib, which likely result from old double-white-dwarf systems with an He-rich secondary. On the other hand, Kawabata et al. suggest that SN 2005cz is indeed a core-collapse event (in a binary system), albeit of a star at the lower end of the mass range, 10-12 M_⊙. The existence of this star in its elliptical host is explained as resulting from low-level star formation (SF) activity in that galaxy. Here we present extensive observations of the location of SN 2005cz, sensitive to a variety of SF tracers, including optical spectroscopy, Hα emission, UV emission, and Hubble Space Telescope photometry. We show that NGC 4589, the host galaxy of SN 2005cz, does not show any signatures of a young stellar population or recent SF activity either close to or far from the location of SN 2005cz.
|Additional Information:||© 2011 American Astronomical Society. Received 2010 December 1; accepted 2011 January 18; published 2011 January 31. We gratefully acknowledge NASA, the Centre National d’Etudes Spatiales of France, and the Korean Ministry of Science and Technology for the development, construction, operation, and science analysis of the GALEX (Galaxy Evolution Explorer) mission.|
|Subject Keywords:||galaxies: star formation – H_(II) regions – stars: formation – supernovae: general – supernovae: individual (SN 2005cz) – white dwarfs|
|Classification Code:||PACS: 97.60.Bw, 95.85.Kr, 97.10.Bt|
|Official Citation:||Hagai B. Perets et al. 2011 ApJ 728 L36 doi: 10.1088/2041-8205/728/2/L36|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Benjamin Perez|
|Deposited On:||22 Mar 2011 20:35|
|Last Modified:||26 Dec 2012 13:06|
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