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The Tornado nebula (G357.7-0.1) is a mysterious radio source with bright"head" and faint "tail" located in the direction of the Galactic center (GC)region. We here report the discovery of two diffuse X-ray sources at the headand tail of the Tornado with the Suzaku satellite. We found emission lines fromhighly ionized atoms in the two sources. The spectra are reproduced by anoptically thin thermal plasma with a common temperature of 0.6-0.7 keV. Theinterstellar absorption (NH) of these sources are the same and are slightlylarger than that of the GC distance. Since the estimated distance using the NHvalue is consistent with the radio observation of the Tornado, these X-raysources are likely associated with the Tornado nebula. The twin-plasmamorphology at the both ends of the Tornado suggests that the system is abipolar/outflow source.

Suzaku Discovery of Twin Thermal Plasma from the Tornado Nebula