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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2023

Collisional excitation of PO+ by para-H2: Potential energy surface, scattering calculations and astrophysical applications

Résumé

We report the derivation of rate coefficients for rotational (de-)excitation PO+ induced by collisions with H2. The calculations were performed on a four-dimensional potential energy surface, obtained top highly accurate ab initio points. Preliminary tests pointed out low influence coupling between j = 0 and higher levels H2 cross sections values, thus allowing to neglect structure On this basis, state-to-state collisional derived temperatures ranging from 5 200 K. Radiative transfer have been used model recent observation in G+0.693-0.027 molecular cloud, order evaluate possible impact non-LTE models determination its physical conditions. column density was found be approximately ∼ 3.7 × 1011 cm−2, which is 60% (a factor 1.7) smaller than previously LTE-derived value. Extensive simulations show that low-j lines exhibit maser behavior at densities 104 106 cm−3, highlighting importance proper treatment accurately emissions interstellar medium.

Dates et versions

hal-04265758 , version 1 (31-10-2023)

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F Tonolo, L. Bizzocchi, V. M. Rivilla, François Lique, M Melosso, et al.. Collisional excitation of PO+ by para-H2: Potential energy surface, scattering calculations and astrophysical applications. Monthly Notices of the Royal Astronomical Society, 2023, ⟨10.1093/mnras/stad3140⟩. ⟨hal-04265758⟩
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