出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present an image of the expanding shell of the remnant associated with supernova
1987A at the highest resolution to date at radio wavelengths, 85 milliarcseconds, using the e-
VLBI technique, from 2007 October. This is comparable to the angular resolution obtained
with the Hubble Space Telescope and is approximately 3 times higher than has been possible
with the Australia Telescope Compact Array or 5 times higher than with the Chandra X-ray
Observatory. The e-VLBI data at 1.4 GHz show good agreement with the ATCA data at 9
GHz, resolving the substructure in the equatorial brightness enhancements of the remnant
(allowing for the fact that the e-VLBI observations are sensitive to structure on angular scales
<0.4”). We place a 3σ upper limit on the time-averaged pulsar emission or a compact pulsarpowered
nebula at this frequency of 1 mJy/beam. These observations were made using
telescopes in Australia, with the data transferred in real-time to the European VLBI Network
correlator at the Joint Institute for VLBI in Europe, in The Netherlands, via high-speed
networks, as part of the EXPReS project, demonstrating the feasibility of a real-time global e-
VLBI network at 512 Mbps per antenna.
