8.4 GHz VLBI observations of SN 2004et in NGC 6946
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8.4 GHz VLBI observations of SN 2004et in NGC 6946

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8.4 GHz VLBI observations of SN 2004et in NGC 6946

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dc.contributor.author Martí Vidal, Iván
dc.contributor.author Marcaide Osoro, Juan María
dc.contributor.author Alberdi, A.
dc.contributor.author Guirado Puerta, Jose Carlos
dc.contributor.author Lara, L.
dc.contributor.author Pérez Torres, Miguel Ángel
dc.contributor.author Ros Ibarra, Eduardo
dc.contributor.author Argo, M.K.
dc.contributor.author Beswick, R.J.
dc.contributor.author Muxlow, T.W.B.
dc.contributor.author Pedlar, A.
dc.contributor.author Shapiro, I.I.
dc.contributor.author Stockdale, C.J.
dc.contributor.author Sramek, R.A.
dc.contributor.author Weiler, K.W.
dc.contributor.author Vinko, J.
dc.date.accessioned 2010-07-13T08:09:17Z
dc.date.available 2010-07-13T08:09:17Z
dc.date.issued 2007
dc.identifier.uri http://hdl.handle.net/10550/15994
dc.description.abstract We report on 8.4 GHz very-long-baseline-interferometry (VLBI) observations of the type II-P supernova SN2004et in the spiral galaxy NGC 6946, made on 20 February 2005 (151 days after explosion). The Very Large Array (VLA) flux density was 1.23 ± 0.07 mJy, corresponding to an isotropic luminosity at 8.4 GHz of (4.45 ± 0.3) × 1025 erg s^−1 Hz^−1 and a brightness temperature of (1.3 ± 0.3) × 108 K. We also provide an improved source position, accurate to about 0.5 mas in each coordinate. The VLBI image shows a clear asymmetry. From model fitting of the size of the radio emission, we estimate a minimum expansion velocity of 15 700 ± 2000 km s^−1. This velocity is more than twice the expected mean expansion velocity estimated from a synchrotron self-absorbed emission model, thus suggesting that synchrotron self-absorption is not relevant for this supernova. With the benefit of an optical spectrum obtained 12 days after explosion, we favor an emission model which consists of two hot spots on an underlying expanding shell of width comparable to that of SN1993J. en
dc.language.iso en en
dc.relation http://www.aanda.org/articles/aa/pdf/2007/30/aa7522-07.pdf en
dc.source MARTI VIDAL, Ivan ; Marcaide Osoro, Juan María ; Alberdi, A. ; Guirado Puerta, Jose Carlos ; Lara, L. ; Pérez Torres, Miguel Ángel ; Ros, E. ; Argo, M.K. ; Beswick, R.J. ; Muxlow, T.W.B. ; Pedlar, A. ; Shapiro, I.I. ; Stockdale, C.J. ; Sramek, R.A. ; Weiler, K.W. ; Vinko, J., 2007, 8.4 GHz VLBI observations of SN 2004et in NGC 6946, Astronomy and astrophysics, vol. 470, no. 3, p. 1071-1077 en
dc.subject Galaxies ; Individual ; NGC 6946 ; Radio continuum ; Stars ; Supernovae ; SN 2004et en
dc.title 8.4 GHz VLBI observations of SN 2004et in NGC 6946 en
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia en
dc.identifier.doi 10.1051/0004-6361:20077522 en
dc.description.private Marti Vidal, Ivan, I.Marti-Vidal@uv.es ; Marcaide Osoro, Juan Maria, J.M.Marcaide@uv.es ; Guirado Puerta, Jose Carlos, Jose.C.Guirado@uv.es ; Perez Torres, Miguel Angel, M.Angel.Perez@uv.es en
dc.identifier.idgrec 043403 en

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