Ionization State in PDR (IC 63 nebula) |
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| Authors: | OM Shalabiea KA Khalil MS EL-Nawawy |
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| Institution: | 1. Department of Astronomy, Faculty of Science, Cairo University, Cairo, Egypt; Space Science Center, Cairo University, Cairo, Egypt
2. Department of Astronomy, Faculty of Science, Al-Azhar University, Egypt
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| Abstract: | We investigated the chemical evolution in IC 63 nebula, a photo-dominated region (PDR). The chemical structure and the ionization state depend directly on the intensity of the incident UV radiation. The electron density is also affected by the incident UV radiation. It decreases gradually with the increase of the depth in the cloud varying from 5.9×10-5 at the surface to 9.6×10-9 in the core. Ionic carbon(C+) dominates the electron density in the outer region while ionic metals and other ions (H+, CH2D+, and HCO+) are the most dominant in the deepest region. Our results at A V = 6.7 mag are in good agreement with observations except in the case of H2S, where the calculated value is lower than the observed value by about two orders of magnitude. |
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