Thermal and Nonthermal Emission from the Crab's Twin SNR B0540-693

Details Thermal and Nonthermal Emission from the Crab's Twin SNR B0540-693 Thermal and Nonthermal Emission from the Crab's Twin SNR B0540-693

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20752r&link_type=abstract

Spitzer Proposal ID #20752

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Scientific paper

We propose a deep spectroscopic investigation of the pulsar-driven supernova remnant B0540-693 in the LMC, known as the "Crab's Twin." This remnant contains a fast pulsar and synchrotron nebula, and a surrounding shell of thermal gas, probably the innermost ejecta. Optical spectra show velocities of order 2000 km/s and indicate an age of order 800 yr. We plan to obtain the broadband continuum shape, which should include the critical region in which spectral steepening between radio and optical must occur, with important implications for modeling pulsar-wind nebulae (PWNe). If hot dust is present, we may be able to detect it. We also plan echelle spectroscopy to obtain fluxes, and velocity profiles, of fine-structure lines of Si, S, Ar, Fe, and perhaps other elements, from which we hope to extract abundances more reliably than can be done with only optical spectra. We expect to determine whether material is shock-heated or photoionized, and will be able to test the prediction of a Type Ib/Ic origin for 0540. Velocity information should allow us to test the extent of velocity stratification and mixing. This object is the only O-rich SNR in which we observe innermost, rather than outer ejecta; with the PWN, it is a unique object and should amply repay careful study with Spitzer.

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