Effects of H0, H2 Excitation on Neon and Argon Infrared Emission-Line Diagnostics.

Astronomy and Astrophysics – Astronomy

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Infrared emission from neon and argon is commonly used as a diagnostic of physical conditions of environments where the majority of H atoms are ionized. However, in regions permeated by a significant X-ray flux (i.e, and XDR of an AGN), Ne+ and Ar+ can have a large abundance in regions where most of the hydrogen atoms are either in the form of H0 or H2. This means, in X-ray dominated environments, a significant fraction of [Ne II] and [Ar II] emission may be due to collisional excitation of these ions by H0 or H2, and not electrons. In this work, we explore the effects that H0 and H2 collisions have on the [Ne II] and [Ar II] spectrum for a typical AGN. We show how the emission-line ratios commonly used as diagnostics of physical conditions change when H0, H2 collisions are considered, and also investigate the effects of this physical process on the physical conditions of the gas.

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