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23 GHz VLBI observations of SN 2008ax (Research Note)

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23 GHz VLBI observations of SN 2008ax (Research Note)

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	Pérez Torres, Miguel Ángel
dc.contributor.author	Ros Ibarra, Eduardo
dc.contributor.author	Shapiro, I.I.
dc.contributor.author	Beswick, R.J.
dc.contributor.author	Muxlow, T.W.B.
dc.contributor.author	Pedlar, A.
dc.contributor.author	Argo, M.K.
dc.contributor.author	Immler, S.
dc.contributor.author	Panagia, N.
dc.contributor.author	Stockdale, C.J.
dc.contributor.author	Sramek, R.A.
dc.contributor.author	Van Dyk, S. D.
dc.contributor.author	Weiler, K.W.
dc.date.accessioned	2010-07-28T11:53:47Z
dc.date.available	2010-07-28T11:53:47Z
dc.date.issued	2009
dc.identifier.citation	MARTÍ-VIDAL, I., Marcaide, J. M., Alberdi, A., GUIRADO, J. C., PÉREZ-TORRES, M. A., ROS, E., SHAPIRO, I. I., BESWICK, R. J., MUXLOW, T. W. B., PEDLAR, A., ARGO, M. K., IMMLER, S., PANAGIA, N., STOCKDALE, C. J., SRAMEK, R. A., VAN DYK, S. and WEILER, K. W. (2009): 23 GHz VLBI observations of SN 2008ax (Research Note), Astronomy and Astrophysics, vol. 499, núm 3, pp. 649	en
dc.identifier.uri	http://hdl.handle.net/10550/16708
dc.description.abstract	We report on phase-referenced 23 GHz Very-Long-Baseline-Interferometry (VLBI) observations of the type IIb supernova SN 2008ax, made with the Very Long Baseline Array (VLBA) on 2 April 2008 (33 days after explosion). These observations resulted in a marginal detection of the supernova. The total flux density recovered from our VLBI image is 0.8 ± 0.3 mJy (one standard deviation). As it appears, the structure may be interpreted as either a core-jet or a double source. However, the supernova structure could be somewhat confused with a possible close by noise peak. In such a case, the recovered flux density would decrease to 0.48 ± 0.12 mJy, compatible with the flux densities measured with the VLA at epochs close in time to our VLBI observations. The lowest average expansion velocities derived from our observations are (1.90 ± 0.30) × 105 km s−1 (case of a double source) and (5.2 ± 1.3) × 104 km s−1 (taking the weaker source component as a spurious, close by, noise peak, which is the more likely interpretation). These velocities are 7.3 and 2 times higher, respectively, than the maximum ejecta velocity inferred from optical-line observations.	en
dc.language.iso	en	en
dc.subject	Galaxies : individual : NGC 4490; Radio continuum : stars; Supernovae : individual : SN 2008ax; Supernovae: general	en
dc.title	23 GHz VLBI observations of SN 2008ax (Research Note)	en
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Galaxias	en
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Estrellas	en
dc.identifier.doi	10.1051/0004-6361/200912034	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://www.aanda.org/index.php?option=article&access=doi&doi=10.1051/0004-6361/200912034	en