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SN 1986J VLBI. The Evolution and Deceleration of the Complex Source and a Search for a Pulsar Nebula by Bietenholz, M. F.; Bartel, N.; Rupen, M. P. is a scholarly article available to read on EtoBox.

What is SN 1986J VLBI. The Evolution and Deceleration of the Complex Source and a Search for a Pulsar Nebula about?

We report on VLBI observations of supernova 1986J in the spiral galaxy NGC 891 at two new epochs, 1990 July and 1999 February, t=7.4 and 15.9 yr after the explosion, and on a comprehensive analysis of these and earlier observations from t~4 yr after the explosion date, which we estimate to be 1983.2 +/- 1.1. The source is a shell or composite, and continues to show a complex morphology with large brightness modulations along the ridge and with protrusions. The supernova is moderately to strongly decelerated. The average outer radius expands as t^(0.71 +/- 0.11), and the expansion velocity has slowed to 6000 km/s at t=15.9 yr from an extrapolated 20,000 km/s at t=0.25 yr. The structure changes significantly with time, showing that the evolution is not self-similar. The shell structure is best visible at the latest epoch, when the protrusions have diminished somewhat in prominence and a new, compact component has appeared. The radio spectrum shows a clear inversion above 10 GHz. This might be related to a pulsar nebula becoming visible through the debris of the explosion. The radio flux density between 1.5 and 23 GHz decreases strongly with time, with the flux density proportional to

Author

Bietenholz, M. F.; Bartel, N.; Rupen, M. P.

Published

2002

Language

EN