First X-ray detection from a bow shock region of a runaway star, BD+43{degree sign}3654, with Suzaku

Searching for new types of particle-acceleration sites is important. Recently, Synchrotron emission has been reported from a bow shock region from a runway star BD+43°3654 with a radio observation by VLA. It was the first discovery of a non-thermal emission from a runaway star. In order to search for possible non-thermal tail in the X-ray band, we have performed the observation of the object BD+43°3654 with Suzaku in April 2011 with the exposure of 105 ksec. As a result, thanks to the stable low-background capability of the XIS, we detected X-rays around the bow shock region. The X-ray luminosity of the diffuse X-rays around the object was about 10 31 erg s−1 in the 0.5 to 10 keV band. In addition, we also detected X-rays from the object itself, BD+43°3654, representing a thermal X-ray spectrum with a temperature of 0.6 keV at the luminosity of 1.3×10 31 erg s−1 in the same band. Detail analyses will be reported in a future paper. The results suggest the conversion efficiency from the momentum of the stel...