X-ray spectroscopy of Cir X-1 through its transition to an exceptionally hard X-ray state

Details X-ray spectroscopy of Cir X-1 through its transition to an exceptionally hard X-ray state X-ray spectroscopy of Cir X-1 through its transition to an exceptionally hard X-ray state

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.3017d&link_type=abstract

Chandra proposal ID #11408348

Physics

Scientific paper

Following a long period of X-ray quiescence Cir X-1 shown a new X-ray re-brightening from May 2010 (Atel #2608).The source has shown a decline of its flux where the X-ray emission become dominated by extended structures (Atel #2650, Atel #2674).A strong radio re-brightening of the source was detected on June 24 by ATCA (Atel #2699). The latest X-ray spectrum observed with Swift XRT (MJD 55373.47, June 26th) revealed an unusually hard spectrum (Gamma ~ 1 power-law) and absorbed by a local absorber (N_h 10^24 cm^-2).The spectrum also shows an intense and broadened iron line at 6.4 keV (eqw. width ~ 200 eV). We request a 20 ks Chandra/HETGS observation of this source with these aims: to resolve the line emitting plasma and the origin of the broadened iron line and to define the role and the physical parameters of the plasma constituting the base of the jet observed in the radio band.

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