An X-ray exploration of a wind bowshock from a single star

BD+43 3654 is a very massive runaway star likely formed in the central region ofCygnus OB2 association. The interaction of its strong wind with the localinterstellar medium has produced a bow shock that has been detected at theinfrared with the MSX. Multifrequency VLA observations carried out by us show aradio structure clearly correlated with the MSX bow shock and a nonthermalcomponent located at the infrared emission peak position. This indicates that arelativistic population of electrons is present in the shock. This particlepopulation can produce a nonthermal Xray component, in addition to the thermalcomponent associated with the shocked gas. We propose to detect for the firsttime the Xray emission from the bow shock produced by a runaway young hot star. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]