Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11234r&link_type=abstract
HST Proposal ID #11234. Cycle 16
Astronomy and Astrophysics
Astronomy
Scientific paper
We propose using WFPC2 to obtain continuum-dominated images of the Crab pulsar and environs closely duplicating archival exposures from 1994 and 1995. By matching the archival data we can realize ~3mas precision astrometry with a minimum of systematic effects over a maximum ~13.5y baseline. This determines the Crab proper motion to better than 0.3mas/yr 3km/s accuracy and measures its position angle to better than 1.5degrees, i.e. reducing the errrors of the best present HST archive measurement by a factor of three. Most importantly, this provide a nearly systematic-free result. This proper motion measurement would match the precision of the CXO-measured angular momentum vector. Comparison of these vectors is the foundation of an effort to understand the physical origin of the large momentum kick at pulsar birth.;
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