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ReportsUnveiling Extensive Clouds of Dark Gas in the Solar Neighborhood
From the comparison of interstellar gas tracers in the solar neighborhood (HI and CO lines from the atomic and molecular gas, dust thermal emission, and g rays from cosmic-ray interactions with gas), we unveil vast clouds of cold dust and dark gas, invisible in HI and CO but detected in
1 Astrophysique Interactions Multi-échelles (CEA/ Universite Paris 7/CNRS), Commissanatá l'Energie Atomique, DSM/DAPNIA, Service d'Astrophysique, CEA, Saclay, 91191 Gif sur Yvette, France. 2 Grand Accélérateur National d'Ions Lourds (CEA/CNRS), boulevard Henri Becquerel, BP 55027, 14076 Caen, France.3 Astroparticules et Cosmologie (CNRS/ Université Paris 7/CEA), 11 place Marcellin Berthelot, 75005 Paris, France.
 rays. They surround all the nearby CO clouds and bridge the dense cores to broader atomic clouds, thus providing a key link in the evolution of interstellar clouds. The relation between the masses in the molecular, dark, and atomic phases in the local clouds implies a dark gas mass in the Milky Way comparable to the molecular one.
* To whom correspondence should be addressed.E-mail: isabelle.grenier{at}cea.fr
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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