Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.511..181m&link_type=abstract
Exploiting the ISO Data Archive. Infrared Astronomy in the Internet Age, held in Siguenza, Spain 24-27 June, 2002. Edited by
Astronomy and Astrophysics
Astronomy
1
Scientific paper
ISOCAM brought striking images of star forming regions but, thanks to its high sensitivity, it also allowed the observation of diffuse interstellar regions. Such observations allow the study of the life cycle of dust even in the diffuse ISM, and particularly through the transition from atomic to molecular gas. In this contribution we report on spectacular variations of small dust grains abundance in cirrus-like clouds observed with ISOCAM. In the four regions observed, we note a systematic disappearance of the small dust grains in regions where CO emission starts to appear. We suggest that the variations of the small dust grain abundance are related to the amplitude of the gas turbulent motions that modify the dust size distribution through grain-grain collisions. These observations raise interesting questions about the thermal and chemical balance of the gas in the first steps of the molecular gas formation in the diffuse interstellar medium.
Boulanger Francois
Falgarone Edith
Joncas Gilles
Miville-Deschênes Marc-Antoine
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