Recent Developments Concerning High-Velocity Clouds

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

I summarize the new developments in HVC research that have occurred in the pastfew years. These include a) the determination of approximate distances to someIVCs and HVC complex A; b) the measurement of the metallicity of the MagellanicStream and the conclusion that tidal forces are dominant in creating the Stream;c) the derivation that the metallicity of complex C is 0.1 solar, with someevidence for metallicity variations; d) the result that N/O in complex C is 0.2times the solar ratio, a value otherwise only seen in dwarf galaxies and DampedLyα systems; e) the discovery of high-velocity OVI absorption, bothassociated with previously known HI HVCs and in directions without a HI HVC;f) the proposal that HVCs form a population of objects permeating the LocalGroup.

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