2007A&A...470.1071M


Query : 2007A&A...470.1071M

2007A&A...470.1071M - Astronomy and Astrophysics, volume 470, 1071-1077 (2007/8-2)

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

MARTI-VIDAL I., MARCAIDE J.M., ALBERDI A., GUIRADO J.C., LARA L., PEREZ-TORRES M.A., 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. and VINKO J.

Abstract (from CDS):

We report on 8.4GHz very-long-baseline-interferometry (VLBI) observations of the type II-P supernova SN2004et in the spiral galaxy NGC6946, made on 20 February 2005 (151 days after explosion). The Very Large Array (VLA) flux density was 1.23±0.07mJy, corresponding to an isotropic luminosity at 8.4GHz of (4.45±0.3)x1025erg/s/Hz and a brightness temperature of (1.3±0.3)x108K. 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 15700±2000km/s. 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.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC6946 - radio continuum: stars - stars: supernovae: individual: SN2004et

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 SN 1986J SN* 02 22 31.33 +42 19 56.4   18.4 18.4     SNII 315 1
2 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1364 1
3 SN 1979C SN* 12 22 58.58 +15 47 52.7   11.6       SNIIL 567 1
4 SN 2001gd SN* 13 13 23.89 +36 38 17.7     16.5     SNIIb 60 1
5 ICRF J202206.6+613658 Sy2 20 22 06.68174620 +61 36 58.8047323     19.5 17.58   ~ 312 1
6 SN 2002hh SN* 20 34 44.29 +60 07 19.0     17.18     SNIIP 144 1
7 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2428 2
8 SN 1968D SN* 20 34 58.40 +60 09 34.4   13.5 13.5     SNII 69 1
9 NVSS J203523+582119 Rad 20 35 23.75233032 +58 21 18.7452370           ~ 11 1
10 SN 2004et SN* 20 35 25.33 +60 07 17.7   12.88       SNIIP 464 1
11 SN 1980K SN* 20 35 30.07 +60 06 23.7   11.6       SNIIL 453 1

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2023.02.02-18:32:15

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