Title:	Specke interferometry of SN 1987A and the "Mystery spot"
Authors:	Nityananda, R.
Issue Date:	24-Feb-1988
Publisher:	Indian Institute of Astrophysics, Bangalore
Citation:	Kodaikanal Observatory Bulletin, 1988, Vol.10, p55-58
Abstract:	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 15' and a separation of 60 milliarcseconds , in a 1002 wide band including H alpha . Among the possible explanations suggested for this remarkable source a r e (i) A relativistic jet breaking out from a weak spot in the supernova shell (ii) Relativistic ejection along 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. The secondary source has now d is appeared leaving us to decide between these two possibilities
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/2567
Alternative Location:	http://adsabs.harvard.edu/cgi-bin/bib_query?1988KodOB..10...55N http://hdl.handle.net/2248/11
Copyright:	1988 Indian Institute of Astrophysics
Appears in Collections:	Research Papers (A&A)

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