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A huge reservoir of ionized gas around the Milky Way: Accounting for the Missing Mass?
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Most of the baryons from galaxies have been "missing" and several studies have attempted to map the circumgalactic medium (CGM) of galaxies in their quest. Recent studies with the Hubble Space Telescope have shown that many galaxies contain a large reservoir of ionized gas with temperatures of about 10^5 K. Here we report on X-ray observations made with the Chandra X-ray Observatory probing an even hotter phase of the CGM of our Milky Way at about 10^6 K. We show that this phase of the CGM is massive, extending over a large region around the Milky Way, with a radius of over 100 kpc. The mass content of this phase is over ten billion solar masses, many times more than that in cooler gas phases and comparable to the total baryonic mass in the disk of the Galaxy. The missing mass of the Galaxy appears to be in this warm-hot gas phase.
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Cited by 2 Pith papers
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CRexit observed: probing cosmic ray transport in the circumgalactic medium with absorption line spectra
Efficient cosmic-ray transport in CR-pressure-dominated CGM simulations produces stronger cool-gas absorption (MgII, SiII) and covering fractions matching star-forming galaxies, while slow transport underproduces them.
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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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