0000000000133229

AUTHOR

Richard Schilizzi

showing 3 related works from this author

Discovery of shell-like radio-structure in SN1993J

1995

The radio-luminous supernova SN 1993J in M81 offers an unprecedented opportunity to study with high linear resolution the details of the growth of a supernova radio structure by means of the VLBI technique.

PhysicsSupernovaMultidisciplinaryAstrophysics::High Energy Astrophysical PhenomenaVery-long-baseline interferometryStructure (category theory)Shell (structure)Astrophysics::Solar and Stellar AstrophysicsAstronomyAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsLinear resolutionAstrophysics::Galaxy Astrophysics
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Deceleration in the Expansion of SN 1993J

1997

A rarity among supernova, SN 1993J in M81 can be studied with high spatial resolution. Its radio power and distance permit VLBI observations to monitor the expansion of its angular structure. This radio structure was previously revealed to be shell-like and to be undergoing a self-similar expansion at a constant rate. From VLBI observations at the wavelengths of 3.6 and 6 cm in the period 6 to 42 months after explosion, we have discovered that the expansion is decelerating. Our measurement of this deceleration yields estimates of the density profiles of the supernova ejecta and circumstellar material in standard supernova explosion models.

Physics010504 meteorology & atmospheric sciencesAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)FOS: Physical sciencesAstronomyAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsAstrophysics01 natural sciencesConstant rateSupernovaWavelengthSpace and Planetary Science0103 physical sciencesVery-long-baseline interferometryHigh spatial resolutionAstrophysics::Solar and Stellar AstrophysicsEjecta010303 astronomy & astrophysicsAstrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesInternational Astronomical Union Colloquium
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Expansion of SN 1993J

1995

A sequence of images from very long baseline interferometry shows that the young radio supernova SN 1993J is expanding with circular symmetry. However, the circularly symmetric images show emission asymmetries. A scenario in which freely expanding supernova ejecta shock mostly isotropic circumstellar material is strongly favored. The sequence of images constitutes the first “movie” of a radio supernova.

PhysicsMultidisciplinaryAstrophysics::High Energy Astrophysical PhenomenaIsotropyAstronomyAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsShock (mechanics)SupernovaVery-long-baseline interferometryAstrophysics::Solar and Stellar AstrophysicsCircular symmetryEjectaAstrophysics::Galaxy Astrophysics
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