Structual Study of Galactic Hot Gas toward Markarian 421 from X-Ray Absorption and Emission Lines

Abstract

We present a structural study of the hot ISM in the Galactic halo along the sight line toward the bright active galactic nucleus Mkn 421. The OVII and OVIII absorption lines were measured with the Low Energy Transmission Grating Spectrograph aboard Chandra toward Mkn 421, and the OVII and OVIII emission lines were observed in the adjacent fields of the sight line with the X-ray Imaging Spectrometer aboard Suzaku. We jointly analyzed the absorption and the emission spectra assuming exponential distributions of the gas temperature and density from the Galactic plane, and constrained the temperature and density at the plane to be $(3.2_{-0.7}^{+0.6})\times 10^6\mathrm{K}$ and $(1.2_{-0.4}^{+0.5})\times 10^{-3}\mathrm{c}{\mathrm{m}}^{-3}$, with the scale heights of $1.6_{-0.7}^{+1.7}\mathrm{kpc}$ and $>2.8\mathrm{kpc}$ respectively. The results are consistent with those obtained in the LMC X-3 direction and the PKS 2155-304 direction, describing a thick disk-like hot gas with its height of a few kpc from the Galactic plane.

27 pages, 15 figures

References in corpus (6)

• X-Ray Absorption from the Milky Way Halo and the Local Group
• High-Resolution X-ray Spectroscopy of the Interstellar Medium II: Neon and Iron Absorption Edges
• Charge-Transfer induced EUV and Soft X-ray emissions in the Heliosphere
• X-ray and UV spectroscopy of Galactic diffuse hot gas along the LMC X--3 sight line
• Xmm-Newton Observations of the Diffuse X-ray Background
• Limits on Hot Galactic Halo Gas from X-ray Absorption Lines

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