Discovery of Galactic OIV and OV X-ray absorption due to transition temperature gas in the PKS 2155-304 spectrum

J. Nevalainen, B. Wakker, J. Kaastra +4

FUV observations have revealed the transition temperature gas (TTG; $\log T(\mathrm{K})$ ~ 5), located in the lower Galactic halo and in the High Velocity Clouds. However, the c…