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A disk-dominated and clumpy circumgalactic medium of the Milky Way seen in X-ray emission
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abstract
The Milky Way galaxy is surrounded by a circumgalactic medium (CGM) that may play a key role in galaxy evolution as the source of gas for star formation and a repository of metals and energy produced by star formation and nuclear activity. The CGM may also be a repository for baryons seen in the early universe, but undetected locally. The CGM has an ionized component at temperatures near $2 \times 10^{6}$~K studied primarily in the soft X-ray band. Here we report a survey of the southern Galactic sky with a soft X-ray spectrometer optimized to study diffuse soft X-ray emission. The X-ray emission is best fit with a disc-like model based on the radial profile of the surface density of molecular hydrogen, a tracer of star formation, suggesting that the X-ray emission is predominantly from hot plasma produced via stellar feedback. Strong variations in the X-ray emission on angular scales of $\sim10^{\circ}$ indicate that the CGM is clumpy. Addition of an extended, and possibly massive, halo component is needed to match the halo density inferred from other observations.
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Cited by 1 Pith paper
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An X-ray Absorption-Line Survey of the Circumgalactic Medium of M31 with XMM-Newton
The first multi-sightline X-ray absorption survey toward M31 reports a 2.2-2.3 sigma excess in O VII and O VIII equivalent widths inside 300-350 kpc, consistent with a hot circumgalactic medium.
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