Physics
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.334..412j&link_type=abstract
Nature (ISSN 0028-0836), vol. 334, Aug. 4, 1988, p. 412-415. NSF-supported research.
Physics
20
Absorption Spectra, H Alpha Line, Neutrinos, Radio Emission, Supernova 1987A, Magellanic Clouds, Very Long Base Interferometry
Scientific paper
The results of VLBI observations of SN1987A are reported. No emission from the supernova above a level of about 20 percent of the supernova's total flux density was detected, although signals were detected from two calibrator sources with amplitudes roughly equal to those determined in earlier VLBI observations. It is inferred that the supernova's radiosphere was resolved, and a lower bound on the radiosphere's radius of 2.2 mas is estimated from an epoch 5.2 days after the neutrino burst. Given the photometric data from the supernova, a distance to the LMC of 50 + or - 5 kpc, and an apparent expansion velocity that varied systematically with time from 18,000-16,000 km/s, as estimated from the blue-shifted H-alpha absorption lines on the days preceding the observations, it is concluded that 5.2 days after the neutrino burst the supernova's radiosphere was at least 2.5 times larger than the inferred blackbody photosphere, and at least as large as the H-alpha line-forming region.
Bartel Norbert
Clark Thomas A.
Jauncey David L.
Kemball Athol
Preston A. R. A. R.
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