Modeling the Pulse Shape of Hercules X-1: Constraints on the Size and Shape of the Accretion Column

Details Modeling the Pulse Shape of Hercules X-1: Constraints on the Size and Shape of the Accretion Column Modeling the Pulse Shape of Hercules X-1: Constraints on the Size and Shape of the Accretion Column

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.2469l&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

Hercules X-1 is the first x-ray pulsar to have observationally determined constraints on the structure of the emission region. The 35-day cycle of pulse shape changes during the 35-day flux cycle "Main High Low Short High Low" is caused by varying obscuration of the emission region by the accretion disk [9]. The pulse shape changes require the inner edge of the disk to be fairly sharp and also require a "reversed fan beam" configuration for the beam pattern from the accretion column. Using a newly developed code for modeling accretion column emission, including gravitational light-b ending effects, the observed pulse shape of Her X-1 is modeled here.

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