The Missing Mass of the Crab Nebula

Details The Missing Mass of the Crab Nebula The Missing Mass of the Crab Nebula

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7761l&link_type=abstract

HST Proposal ID #7761

Physics

Hst Proposal Id #7761 Stellar Ejecta

Scientific paper

The Crab Nebula, along with its central pulsar and its explosive origin in SN 1054, plays a crucial role in our understanding of the link between supernovae and pulsar formation and activity. Yet, there are fundamental uncertainties in the nature of the event that have not been settled in more than two decades of investigation. The observed mass in the nebula and pulsar is less than half of the expected initial stellar mass and the observed energy is only a few percent of the typical supernova energy. Resting on the assumption that the ``missing mass'' is in a high velocity envelope around the observed nebula, we propose to search for this fast shell by taking a STIS spectrum of the Crab pulsar in the region of the C IV 1550 line. According to time-dependent ionization calculations this line should produce a detectable broad, blueshifted absorption if the shell is present. Our spectrum will also narrow significantly the gap of the pulsar spectrum between the optical/UV and X-ray range.

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