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F. Lu, D. Wang (U. Massachusetts)
We present a Chandra ACIS observation of SNR G54.1+0.3. Morphologically, the supernova remnant is resolved into multiple X-ray emitting components. The bright central point-like source (CXOU J193030.13+185214.1) is clearly the putative pulsar; a surrounding torus most likely means the shock of an equatorial wind from the pulsar; two plumes are perhaps cocoons of jets laminating from the pulsar; extended low surface brightness emission represents the accumulated pulsar wind materials. Spectroscopically these components are all satisfactorily described by a power law; the spectrum becomes increasingly steep with increasing scale. Furthermore, no evidence for any thermal plasma emission is found that might represent the blast-wave of the remnant. SNR G54.1+0.3 is therefore the closest known ``cousin'' of the Crab nebula, which shows similar morphological and spectral characteristics.