تقرير
Revisiting the gas-phase chemical rate coefficients at high temperatures in CLOUDY
| العنوان: | Revisiting the gas-phase chemical rate coefficients at high temperatures in CLOUDY |
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| المؤلفون: | Shaw, Gargi, Ferland, Gary, Chatzikos, M. |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | A two-body gas-phase reaction rate coefficient can be given by the usual Arrhenius-type formula which depends on temperature. The UMIST Database for Astrochemistry is a widely used database for reaction rate coefficients. They provide fittings for coefficients valid over a particular range of temperatures. The permissible upper-temperature limits vary over a wide range: from 100 K to 41000K. A wide range of temperatures occurs in nature; thus, it requires evaluating the rate coefficients at temperatures outside the range of validity. As a result, a simple extrapolation of the rate coefficients can lead to unphysically large values at high temperatures. These result in unrealistic predictions. Here we present a solution to prevent the gas-phase reaction coefficients from diverging at a very high temperature. We implement this into the spectral synthesis code CLOUDY which operates over a wide range of temperatures from CMB to 10$^{10}$ K subject to different astrophysical environments. Comment: Submitted, comments welcome. Three pages, one figure |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2308.02500 |
| رقم الأكسشن: | edsarx.2308.02500 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |