The Warm Gas in the MW: the Kinematical Model of C IV and its Connection with Si IV
Zhijie Qu,
Ryan Lindley,
Joel N. Bregman
Abstract:We compose a 265-sight line MW C IV line shape sample using the HST/COS archive, which is complementary to the existing Si IV samples. C IV has a higher ionization potential (47 − 64 eV) than Si IV (33 − 45 eV), so it also traces warm gas, which is roughly cospatial with Si IV. The spatial density distribution and kinematics of C IV is identical with Si IV within ≈ 2σ. C IV is more sensitive to the warm gas density distribution at large radii with a higher element abundance. Applying the kinematical model to t… Show more
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