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Communication Dans Un Congrès Année : 2018

Star Formation with ALMA

S. Guilloteau

Résumé

Stars are believed to form from interstellar material through the gravitational collapse of dusty clouds. Interstellar medium is a very dynamical environment in which clouds of atomic gas (and its associated dust counterpart) form in warm medium fragments, perhaps as a result of turbulence or the passage of shock, and subsequently cool down and condense. Although the dust is a tiny fraction (of order 1%) of the total material mass, it plays a major role in the cloud evolution because its opacity can shield the cloud center from the interstellar UV field and dust surfaces act as a catalyst on which molecular hydrogen can form. For high enough column density, the combined effect of dust shielding and self-shielding of H 2 2 turn the initially predominantly atomic gas into molecular form. H 2 2 forms first, but more and more complex species such as CO, CN, and HCN, form during cloud evolution.

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Dates et versions

hal-01868326 , version 1 (05-09-2018)

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S. Guilloteau. Star Formation with ALMA. 38th SAAS-FEE Advanced Course on Millimeter Astronomy - 3-8 Mar 2008. Les Diablerets, Switzerland - Millimeter Astronomy, Saas-Fee Advanced Course, Volume 38. ISBN 978-3-662-57545-1. Springer-Verlag GmbH Germany, part of Springer Nature, 2018, p. 111, Mar 2018, Les Diablerets, Switzerland. ⟨10.1007/978-3-662-57546-8_2⟩. ⟨hal-01868326⟩

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