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Title: The distribution and kinematics of interstellar O VI in the milky way
Authors: Sarma, R
Pathak, A
Murthy, J
Sarma, J. K
Keywords: ISM: atoms;ISM: galaxies;Milky Way
Issue Date: 1-Feb-2017
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 464, No. 4, pp. 4927-4937
Abstract: We present the results of a survey of interstellar O vi absorption in the Milky Way (MW) towards 69 stars in the Large Magellanic Cloud obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE). The integrated MW O vi column densities log N(O vi) are in the range from 13.68 to 14.73 with a mean of 14.26+0.07−0.09 atoms cm−2. The O vi exponential scale height is found to be 2.28 ± 1.06 kpc. The O vi column density correlates with the Doppler parameter b. The O vi velocity dispersion ranges from 14.0 to 91.6 with an average value of 62.7 km s−1. These high values of the velocity dispersion reveal the effect of turbulence, multiple velocity components and collision on broad O vi profiles. There is a significant variation of the O vi column density on all scales studied (0 ∘.0025–6 ∘.35). The smallest scale for which O vi column density variations has been found is Δθ ∼ 9 arcsec. A comparison of the O vi velocity profiles with Fe ii indicates the presence of intermediate-velocity cloud and/or high-velocity cloud components in the O vi absorption.
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