NAGIOS: RODERIC FUNCIONANDO

8.4 GHz VLBI observations of SN 2004et in NGC 6946

Repositori DSpace/Manakin

IMPORTANT: Aquest repositori està en una versió antiga des del 3/12/2023. La nova instal.lació está en https://roderic.uv.es/

8.4 GHz VLBI observations of SN 2004et in NGC 6946

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.citation	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.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.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	journal article	es_ES
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.identifier.idgrec	043403	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://www.aanda.org/articles/aa/pdf/2007/30/aa7522-07.pdf	en