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• W2064968482 endingPage "157" @default.
• W2064968482 startingPage "157" @default.
• W2064968482 abstract "We present a study of the properties of the transition temperature (T ∼ 105 K) gas in the Milky Way corona, based on the measurements of O vi, N v, C iv, Si iv, and Fe iii absorption lines seen in the far-ultraviolet spectra of 58 sight lines to extragalactic targets, obtained with the Far-Ultraviolet Spectroscopic Explorer and the Space Telescope Imaging Spectrograph. In many sight lines the Galactic absorption profiles show multiple components, which are analyzed separately. We find that the highly ionized atoms are distributed irregularly in a layer with a scale height of about 3 kpc, which rotates along with the gas in the disk, without an obvious gradient in the rotation velocity away from the Galactic plane. Within this layer the gas has randomly oriented velocities with a dispersion of 40–60 km s−1. On average the integrated column densities are log N(O vi) = 14.3, log N(N v) = 13.5, log N(C iv) = 14.2, log N(Si iv) = 13.6, and log N(Fe iii) = 14.2, with a dispersion of just 0.2 dex in each case. In sight lines around the Galactic center and Galactic north pole, all column densities are enhanced by a factor ∼2, while at intermediate latitudes in the southern sky there is a deficit in N(O vi) of about a factor of two, but no deficit for the other ions. We compare the column densities and ionic ratios to a series of theoretical predictions: collisional ionization equilibrium, shock ionization, conductive interfaces, turbulent mixing, thick disk supernovae, static non-equilibrium ionization (NIE) radiative cooling, and an NIE radiative cooling model in which the gas flows through the cooling zone. None of these models can fully reproduce the data, but it is clear that NIE radiative cooling is important in generating the transition temperature gas." @default.
• W2064968482 created "2016-06-24" @default.
• W2064968482 creator A5021977014 @default.
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• W2064968482 creator A5032091808 @default.
• W2064968482 creator A5036808277 @default.
• W2064968482 creator A5059056180 @default.
• W2064968482 date "2012-04-03" @default.
• W2064968482 modified "2023-10-15" @default.
• W2064968482 title "CHARACTERIZING TRANSITION TEMPERATURE GAS IN THE GALACTIC CORONA" @default.
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