X-ray jets in CirX-1

Physics

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Chandra Proposal Id #08408269

Scientific paper

CirX-1 is a neutron star (Tennant et al 1986a,b). The X-ray and radio flux of CirX-1 have gradually decayed over the last few years. Recently the radio flux has increased dramatically (ATel 985). The source has returned to the low X-ray-flux high radio-flux state as found in the 1970-80ties. On March 6 Fender observed a radio jet using ATCA at 2" from the core. Interestingly, the position angle of the radio jet has changed. The large radio flares suggest that major ejection events take place. We propose a 50 ksec HRC-I observation to take advantage of the current favorable source/jet count rate ratio to search for an X-ray counterpart to the new radio jet emission. We assumed that the X-ray flux and spectrum of a jet is the same as the X-ray jet observed in XTE J1550-564. For the X-ray flux of CirX-1 we took the value from our SWIFT-XRT ToO observation of March 19. We simulated with ChaRT/marx that even a jet placed at a distance of 0.75" is detectable.

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