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A&A 436, L53-L56 (2005)
DOI: 10.1051/0004-6361:200500122
Letter
Tiny H I clouds in the local ISM
R. Braun1 and N. Kanekar21 ASTRON, Postbox 2, 7990 AA Dwingeloo, The Netherlands
e-mail: braun@astron.nl
2 National Radio Astronomy Observatory, Socorro, NM 87801, USA
e-mail: nkanekar@aoc.nrao.edu
(Received 22 April 2005 / Accepted 9 May 2005)
Abstract
We report deep, high spectral resolution WSRT
21 cm
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
%,
column densities of
0.4-
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
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.
Key words: ISM: clouds -- ISM: bubbles -- stars: winds, outflows -- Galaxy: solar neighbourhood
SIMBAD Objects
© ESO 2005
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