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Autori: P. Soleri, S. Heinz, R. Fender, R. Wijnands, V. Tudose, D. Altamirano, P.G. Jonker, M. van der Klis, L. Kuiper, C. Kaiser, P. Casella
Editorial: Monthly Notices of the Royal Astronomical Society, 397, p.L1, 2009.
We present the results of the analysis of two Chandra observations of Circinus X-1 performed in 2007, for a total exposure time of ~50 ks. The source was observed with the High Resolution Camera during a long X-ray low-flux state of the source. Cir X-1 is an accreting neutron star binary system that exhibits ultra-relativistic arcsec-scale radio jets and an extended arcmin-scale radio nebula. Furthermore, a recent paper has shown an X-ray excess on arcmin-scale prominent on the side of the receding radio jet. In our images, we clearly detect X-ray structures on both the side of the receding and the approaching radio jet. The X-ray emission is consistent with a synchrotron origin. Our detection is consistent with neutron star binaries being as efficient as black hole binaries in producing X-ray outflows, despite their shallower gravitational potential.
Cuvinte cheie: ISM: jets and outflow, stars: individual: Cir X-1, X-rays: binaries