Tiny HI Clouds in the Local ISM

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

2005-05-03

arxiv.org/abs/astro-ph/0505055v3

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, accepted for publication in A&A Letters, final corrections

Scientific paper

10.1051/0004-6361:200500122

We report deep, high spectral resolution WSRT HI 21cm observations of four high latitude compact radio sources, that have revealed a new population of tiny, discrete clouds in the diffuse ISM, with peak optical depths tau ~ 0.1-2%, HI column densities of 0.4-8 * 10^{18} cm^{-2} and core temperatures of 20-80 K. Imaging detections confirm these low column densities and imply linear core dimensions of a few thousand AU, assuming a distance of 100 pc. The physical origin of these tiny HI structures and their distribution in the ISM is at present unknown. Further observations will be required to determine whether they are a ubiquitous component of the ISM.

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