Journal Article

Radiative cooling functions for primordial molecules

C. M. Coppola, L. Lodi and J. Tennyson

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 1, pages 487-493
Published in print July 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18723.x
Radiative cooling functions for primordial molecules

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Cooling of primordial gas plays a crucial role in the birth of the first structures in our Universe. Due to the low fractional abundance of molecular species at high redshifts, spontaneous emission rather than collisions represents the most efficient way to cool the pristine plasma. In the present work, radiative cooling functions are evaluated for the diatomic species HD, HD+, HeH+, LiH and LiH+. Cooling functions for the triatomic ions H+3 and H2D+ are also considered. Analytic fits as functions of temperature are provided.

Keywords: molecular processes; early Universe

Journal Article.  4370 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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