Radiative cooling functions for primordial molecules

Details Radiative cooling functions for primordial molecules Radiative cooling functions for primordial molecules

2011-03-15

arxiv.org/abs/1103.2957v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 9 figures, 1 table

Scientific paper

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 H$_2$D$^+$ are also considered. Analytic fits as functions of temperature are provided.

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