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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents

ID: 11723.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Strongly decelerated expansion of SN1979C
Authors:Marcaide, J. M.; Pérez-Torres, M. A.; Ros, E.; Alberdi, A.; Diamond, P. J.; Guirado, J. C.; Lara, L.; Van Dyk, S. D.; Weiler, K. W.
Date of Publication (YYYY-MM-DD):2002-03
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:2
Start Page:408
End Page:413
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We observed SN1979C in M100 on 4 June 1999, about twenty years after explosion, with a very sensitive four-antenna VLBI array at the wavelength of lambda18 cm. The distance to M100 and the expansion velocities are such that the supernova cannot be fully resolved by our Earth-wide array. Model-dependent sizes for the source have been determined and compared with previous results. We conclude that the supernova shock was initially in free expansion for 6 +/- 2 yrs and then experienced a very strong deceleration. The onset of deceleration took place a few years before the abrupt trend change in the integrated radio flux density curves. We estimate the shocked swept-up mass to be M-sw similar to 1.6 M-circle dot, assuming a standard density profile for the CSM. Such a swept-up mass for SN1979C suggests a mass of the hydrogen-rich envelope ejected at explosion no larger than M-env similar to 0.9 M-circle dot. If SN1979C originated in a binary star, the low value of Menv suggests that the companion of the progenitor star stripped off most of the hydrogen-rich envelope mass of the presupernova star prior to the explosion.
Free Keywords:techniques : interferometric; supernovae : individual : SN1979C; ISM : supernova remnants; radio continuum : stars; galaxies : individual : M100
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Univ Valencia, Dept Astron, E-46100 Burjassot, Spain; Univ Valencia, Dept Astron, E-46100 Burjassot, Spain; CNR, Ist Radioastron, I-40129 Bologna, Italy; Max Planck Inst Radioastron, D-53121 Bonn, Germany; CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain; Jodrell Bank Observ, MERLIN VLBI Natl Facil, Macclesfield SK11 9DL, Cheshire, England; CALTECH, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA; USN, Remote Sensing Div, Res Lab, Washington, DC 20375 USA
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