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X-ray Spectroscopy of Galactic Hot Gas along the PKS 2155-304 Sight Line

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arxiv 1006.4901 v1 pith:YG5LLIWT submitted 2010-06-25 astro-ph.HE

X-ray Spectroscopy of Galactic Hot Gas along the PKS 2155-304 Sight Line

Toshishige Hagihara , Yangsen Yao , Noriko Y. Yamasaki , Kazuhisa Mitsuda , Q. Daniel Wang , Yoh Takei , Tomotaka Yoshino , Dan McCammon This is my paper
classification astro-ph.HE
keywords densitydirectiongalactictemperatureaboardabsorptionemissionlines
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We present a detailed spectroscopic study of the hot gas in the Galactic halo toward the direction of a blazer PKS 2155-304 (z=0.117). The OVII and OVIII absorption lines are measured with the Low and High Energy Transmission Grating Spectrographs aboard Chandra, and the OVII, OVIII, and NeIX emission lines produced in the adjacent field of the PKS 2155-304 direction are observed with the X-ray Imaging Spectrometer aboard Suzaku. Assuming vertically exponential distributions of the gas temperature and the density, we perform a combined analysis of the absorption and emission data. The gas temperature and density at the Galactic plane are determined to be 2.5(+0.6,-0.3) MK and 1.4(+0.5,-0.4) x 10^{-3} cm^{-3} and the scale heights of the gas temperature and density are 5.6(+7.4,-4.2) kpc and 2.3(+0.9,-0.8) kpc, respectively. These values are consistent with those obtained in the LMC X-3 direction.

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