Speaker
Description
The Crab Nebula, the pulsar wind nebula surrounding the Crab pulsar, is one of the most thoroughly studied objects in the sky, and it might appear unlikely that, at this stage, radio observations could shed new light on its properties. In this talk, I will present a subarcsecond resolution image of the nebula at 150 MHz, possibly the highest dynamic range image ever made with LOFAR. The new observations allow us to measure the expansion of the pulsar wind nebula, which resulted from a supernova explosion in 1054. More interestingly, our map shows new absorption features in a filament southwest of the pulsar, including knots with a spectral index of approximately 3 (for $S_\nu \propto \nu^\alpha$). I will discuss free-free absorption and synchrotron self-absorption as the possible origins for the observed absorption features, and their implications for the physical conditions in the knots.
| If we aren't able to schedule this contribution for a talk, would you like to present it as a poster instead? | Yes |
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