The Large-Scale, Decelerating X-ray Jets from the Microquasar Xte J1550?564: Evidence for External Shocks Caused by the Jet-Ism Interaction? |
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| Authors: | X Y Wang Z G Dai T Lu |
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| Institution: | (1) Department of Astronomy, Nanjing University, Nanjing, China;(2) Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China |
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| Abstract: | Large-scale, decelerating, relativistic X-ray jets from microquasar XTE J1550−564 has been recently discovered with Chandra by Corbel et al. (2002). We find that the dynamical evolution of the approaching jet at the late time is consistent with
the well-known Sedov evolutionary phase R∝ t
2/5. A trans-relativistic external shock dynamic model by analogy with the evolution of gamma-ray burst remnants, is shown to
be able to fit the proper-motion data of the approaching jet reasonably well. The inferred interstellar medium density around
the source is well below the canonical value n
ISM∼1 cm−3. The rapidly fading X-ray emission can be interpreted as synchrotron radiation from the non-thermal electrons in the adiabatically
expanding ejecta. These electrons were accelerated by the reverse shock (moving back into the ejecta) which becomes important
when the inertia of the swept external matter leads to an appreciable slowing down of the original ejecta. |
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| Keywords: | stars: individual (XTE J1550-564) gamma rays: bursts ISM: jets and outflows radiation mechanisms: non-thermal |
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