HETG Zero Phase Spectroscopy of Circinus X-1

Details HETG Zero Phase Spectroscopy of Circinus X-1 HETG Zero Phase Spectroscopy of Circinus X-1

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop..176b&link_type=abstract

Chandra Proposal ID #01400876

Physics

Chandra Proposal Id #01400876

Scientific paper

We propose to make the first grating-resolution X-ray spectra of Cir X-1 during one of its zero phase passages. Our ASCA analyses of Cir X-1 have shown that its variable iron K features can be explained using a direct flux plus scattered flux model, and HETG spectra will test our model. During zero phase `dips' we expect line emission from an accretion disk corona (ADC), since we predict predominantly ADC scattered emission below 5 keV. Line measurements will constrain the ADC ionization parameter, temperature, thickness and motion. We will also make the highest resolution iron K line/edge measurements and use them to study obscuring matter. Our observation will not cause telemetry saturation, and our dispersed spectra will not have serious photon pile up.

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