Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12434l&link_type=abstract
HST Proposal ID #12434. Cycle 18
Physics
Scientific paper
Physics of activity in the "wisps" of the Crab nebula remains poor understood, with shocks, in situ particle acceleration and magnetic field all proposed to be the driving factors. A recent flare in the Crab Nebula discovered with AGILE offers an excellent opportunity to shed the light on this issue. The flare has been successfully observed with Chandra, HST, and VLBI {EVN+MERLIN}, with the flaring region {located at 5" west from the Crab pulsar} remaining in a high state for over two months and showing a brightness temperature of >10^7 . Such a peculiar behavior is difficult to explain with the usual shock scenario. Instead it may imply a magnetic field build up or reconnection, which may turn out a common mechanism driving the activity in the "wisps" inside the Crab nebula. New observations with VLBI {23-24 November} and Chandra {27 November} are aiming at further investigating this possibility. We propose here to image the flaring region concurrently with the HST in order to be able to address radio-optical-X-ray spectral properties and also to study the evolution of the flaring region in all three bands by comparing the new images with the ones made during the previous round of concurrent observations {made about one month ago}.;
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