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Science 307 (2005) 1292-1295
Unveiling Extensive Clouds of Dark Gas in the Solar Neighborhood
I.A. Grenier1, 2, J.-M. Casandjian1, 2, 3, R. Terrier4

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 ? 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 ? 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.
1 :  AIM - UMR 7158 - Astrophysique Interactions Multi-échelles
2 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
3 :  GANIL - Grand Accélérateur National d'Ions Lourds
4 :  APC - UMR 7164 - AstroParticule et Cosmologie
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique