منابع مشابه
Sn 1993j Vlbi (iii): the Evolution of the Radio Shell
A sequence of images of supernova 1993J at 30 epochs, from 50 d to ∼ 9 yr after shock breakout, shows the evolution of the expanding radio shell of an exploded star in detail. The images were obtained from 24 observing sessions at 8.4 GHz and 19 at 5.0 GHz and from our last session at 1.7 GHz. The images are all phase-referenced to the stable reference point of the core of the host galaxy M81. ...
متن کاملSimulated Radio Images and Light Curves of SN 1993J
We present calculations of the radio images and light curves from supernovae, based on high-resolution numerical simulations of the hydrodynamics and radiation transfer in a spherically symmetric medium. As a specific example we model the emission from SN1993J. This supernova does not appear to be expanding in a self-similar fashion, and cannot be adequately fitted with the often-used analytic ...
متن کاملRadio emission and nonlinear diffusive shock acceleration of cosmic rays in the supernova SN 1993J
Aims. The extensive observations of the supernova SN 1993J at radio wavelengths make this object a unique target for the study of particle acceleration in a supernova shock. Methods. To describe the radio synchrotron emission we use a model that couples a semianalytic description of nonlinear diffusive shock acceleration with self-similar solutions for the hydrodynamics of the supernova expansi...
متن کاملThe role of synchrotron self-absorption in the late radio emission from SN 1993J
The standard model for radio supernovae considers that the observed synchrotron radio emission arises from the high-energy shell that results from the strong interaction between the expanding supernova ejecta and the circumstellar medium. This emission is considered to be only partially absorbed by ionized thermal electrons in the circumstellar wind of the progenitor star. Based on a study of t...
متن کاملLow frequency observations of SN 1993J with Giant Meterwave Radio Telescope
In this paper, we discuss the low frequency spectrum of SN 1993J with GMRT. We observed SN 1993J at several epochs in 20cm, 50cm, 90cm and 125cm wavelengths and achieved near simultaneous spectra. We fit synchrotron self absorption (SSA) and free-free models to the data. We compare the size of SN obtained using SSA fits to that of size extrapolated from VLBI measurements at various epochs using...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 2005
ISSN: 0252-9211
DOI: 10.1017/s0252921100008964