Juan-María Marcaide
Dept. Astronomia Astrofísica, Univ. València (Valence, Espagne)
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
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| « The spatial structures of radio supernovae: yields and challenges of SN1993J » |
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Juan-María Marcaide |
| o supernova has been sighted in our galaxy since the discovery of the telescope, yet the present discovery rate is about 1 sn/day. Indeed, Type Ia supernovae have become essential tools for us to understand the contents of the universe. However, only the Type Ib, Ic and II (core collapse) supernovae are radio loud and only a handful of them are nearby enough to be resolved by earth-size radio arrays. Much has been recently learned about the spatial structure of radio supernovae. SN1987A, SN1986J, and SN1993J have turned out to be remarkable cases. Ten years of careful VLBI monitoring of SN1993J have yielded dozens of detailed images of this supernova, which have been used to make, for the first time, a movie of the expansion. It turns out that the expansion is non-uniformly decelerated and that a puzzling discrepancy is apparent between the expansions determined at two wavelengths. The correct interpretation of the discrepancy appears very challenging at present. |
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vendredi 22 octobre 2004 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |