Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-12-22
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
6 pages, 4 figures, accepted for publication in ApJL
Scientific paper
We present a detailed analysis of the first very long baseline interferometry (VLBI) detection of the radio remnant of supernova 1987A. The VLBI data taken in 2007 and 2008 at 1.4 and 1.7 GHz, respectively, provide images sensitive to angular scales from 0.1" to 0.7", the highest resolution to date at radio frequencies. The results reveal two extended lobes with an overall morphology consistent with observations at lower resolutions. We find evidence of small-scale features in the radio shell, which possibly consist of compact clumps near the inner surface of the shell. These features have angular extent smaller than 0.2" and contribute less than 13% of the total remnant flux density. No central source is detected in the VLBI images. We place a 3-sigma flux density limit of 0.3 mJy on any pulsar or pulsar wind nebula at 1.7 GHz.
Gaensler Bryan M.
Ng Cheuk-Yiu
Phillips Chris
Potter T. M.
Staveley--Smith Lister
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