Photoionization in the Microquasar Circinus X-1

Details Photoionization in the Microquasar Circinus X-1 Photoionization in the Microquasar Circinus X-1

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2365s&link_type=abstract

Chandra Proposal ID #09400314

Physics

Chandra Proposal Id #09400314

Scientific paper

We propose to reobserve the X-ray binary Circinus X-1 for a total of 35 ks within an orbital phase window of 0.96 - 0.99 within its 16.5 day orbital cycle using the HETGS. Circinus~X-1 is currently in a low flux state with respect to its longterm (30 yr) lightcurve. A short previous observation of the source at this phase revealed a remarkable emission line spectrum rich in high Z K-shell lines from Si, S, Ar, Ca, and Fe. While the overall spectrum was successfully modeled using the most recent version of the photoionization code XSTAR, we encountered problems in the modeling of specific lines which to a large extent are related to the short exposure and shortcomings in the instrumental setup.

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