Tiny HI Clouds in the Local ISM

Details Tiny HI Clouds in the Local ISM Tiny HI Clouds in the Local ISM

2004-09-17

arxiv.org/abs/astro-ph/0409427v1

Astronomy and Astrophysics

Astrophysics

6 pages, 8 figures, to appear in "The IMF at 50", eds. E. Corbelli, F. Palla, and H. Zinnecker, ASSL (Kluwer)

Scientific paper

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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