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

Abstract

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.

12 pages, 10 figures, accepted in PASJ

References in corpus (4)

• X-Ray Absorption from the Milky Way Halo and the Local Group
• OVII and OVIII line emission in the diffuse soft X-ray background: heliospheric and galactic contributions
• X-ray and UV spectroscopy of Galactic diffuse hot gas along the LMC X--3 sight line
• Chandra and Far Ultraviolet Spectroscopic Explorer Observations of z~0 Warm-Hot Gas Toward PKS 2155-304

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