The infrared response of molecular hydrogen gas to ultraviolet radiation - A scaling law

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infrared Astronomy, Interstellar Gas, Molecular Gases, Scaling Laws, Ultraviolet Absorption, Incident Radiation, Luminous Intensity, Molecular Clouds

Scientific paper

A scaling law for molecular hydrogen clouds is presented. The law relates the dependence of the intensities of the infrared fluorescent emission line produced in low-density, cold, isothermal, static photodissociation regions of such clouds on the gas density, the intensity of the incident UV radiation, the molecular formation rate coefficient, and the effective grain continuum UV absorption cross-section to a single calculated reference spectrum and a UV-to-IR conversion efficiency function. The computed reference spectrum and conversion efficiency function are presented for a gas cloud at a temperature of 1000 K, and observations of fluorescent emission in the two reflection nebulae Parsamyan 18 and NGC 2023 are analyzed.

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