a Search for Pulsations from the Central Core of G21.5-0.9

Details a Search for Pulsations from the Central Core of G21.5-0.9 a Search for Pulsations from the Central Core of G21.5-0.9

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop..831m&link_type=abstract

Chandra Proposal ID #03500072

Statistics

Chandra Proposal Id #03500072

Scientific paper

G21.5-0.9 is a Crab-like synchrotron nebula that is presumably powered by a central pulsar. ACIS observations show that the power law index of the nebula flattens with radius, indicative of the synchrotron burn-off of electrons injected in the center. HRC observations show a central compact emission region that is extended, with some indication of an embedded point source. We propose an HRC timing observation with an exposure of 30 ks in order to search for pulsations from the compact core of G21.5-0.9. The count rate of the compact central region is 0.05 counts/s, so the proposed exposure would yield 1500 counts, thus providing sufficient statistics for a powerful timing search even if the pulsations are somewhat dilluted by diffuse central emission. GTO Priority "A"

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