Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001natur.412..308k&link_type=abstract
Nature, Volume 412, Issue 6844, pp. 308-310 (2001).
Computer Science
34
Scientific paper
A large fraction of the mass of the interstellar medium in our Galaxy is in the form of warm (103-104K) and cool (50-100K) atomic hydrogen (HI) gas. Cold (10-30K) regions are thought to be dominated by dense clouds of molecular hydrogen. Cold HI is difficult to observe, and therefore our knowledge of its abundance and distribution in the interstellar medium is poor. The few known clouds of cold HI are much smaller in size and mass than typical molecular clouds. Here we report the discovery that the HI supershell GSH139-03-69 is very cold (10K). It is about 2kiloparsecs in size and as massive as the largest molecular complexes. The existence of such an immense structure composed of cold atomic hydrogen in the interstellar medium runs counter to the prevailing view that cold gas resides almost exclusively in clouds dominated by molecular hydrogen.
Brunt Christopher M.
Knee Lewis B. G.
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