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Author Nityananda, Rajarama
Source Indian Institute of Astrophysics
Content type Text
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics
Subject Keyword Speckle Interferometry ♦ Supernova 1987A
Description Two groups have independently studied SN1987A by the technique of optical speckle interferometry in the visible region of wavelengths about a month after the explosion. Both detect a secondary source a factor of ten fainter than the primary, at a position angle of 15o and a separation of 60 milliarcseconds, in a 100Å wide band including Hα. Among the possible explanations suggested for this remarkable source are (i) A relativistic jet breaking out from a weak spot in the supernova shell (ii) Relativistic ejection among the axis of rotation during the collapse (iii) Ionisation of a nearby gas cloud by a flash of hard radiation emitted at a very early stage, followed by recombination.
ISSN 03743632
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Institution Indian Institute of Astrophysics
Size (in Bytes) 115.99 kB
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