arxiv: astro-ph/0409427 · v1 · pith:G33ANPT3new · submitted 2004-09-17 · 🌌 astro-ph

Tiny HI Clouds in the Local ISM

Robert Braun (1) , Nissim Kanekar (2) ((1) ASTRON , (2) Kapteyn Inst.) This is my paper

classification 🌌 astro-ph

keywords tinyabsorptioncloudsconfirmcorecorrespondingdarkdetections

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Very sensitive HI absorption spectra (tau RMS about 10^-4 over 1 km/s) toward high latitude QSOs have revealed a population of tiny discrete features in the diffuse ISM with peak tau of 0.1 - 2% and core line-widths corresponding to temperatures as low as 20 K. Imaging detections confirm linear dimensions of a few 1000 AU. We suggest these structures may be formed by the stellar winds of intermediate mass stars. A more speculative origin might involve molecular "dark matter".

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Tiny HI Clouds in the Local ISM

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