Bibliographic Details
Title: |
Passage of a Gamma-Ray Burst through a Molecular Cloud: Cloud Ionization Structure. |
Authors: |
Nesterenok, A. V.1 (AUTHOR) alex-n10@yandex.ru |
Source: |
Astronomy Letters. Feb2024, Vol. 50 Issue 2, p99-119. 21p. |
Subject Terms: |
*MOLECULAR clouds, *ULTRAVIOLET radiation, *ION emission, *ELECTRON emission, *RADIATION absorption, *PHOTOIONIZATION, *GAMMA ray bursts, *ELECTRON impact ionization |
Abstract: |
We have constructed a model for the passage of gamma-ray burst radiation through a dense molecular cloud. In our calculations we take into account the main radiation–cloud material interaction processes: the ionization of H and He atoms, the ionization of metal ions with the emission of Auger electrons, the ionization and photodissociation of H molecules, the absorption of ultraviolet radiation in the H lines of the Lyman and Werner bands, and the vaporization of dust grains. The ionization of metal ions by X-ray radiation determines the gas ionization fraction in the region where the gas is predominantly neutral. The photoionization of the inner electron shells of ions is accompanied by the emission of Auger electrons, giving rise to metal ions in a high ionization state. In particular, the column densities of Mg, Si, and Fe ions in the ionization states I–IV are much lower than the column densities of these ions in the ionization state V or higher. The photoionization of metal ions by ultraviolet radiation occurs only at distances smaller than the dust vaporization radius and for neutral atoms with an ionization threshold below 13.6 eV. The results of our calculations have confirmed the previously made assumption that the ionization of He atoms plays an important role in the absorption of radiation in the X-ray wavelength range. For a low metallicity, , the role of helium atoms is dominant. [ABSTRACT FROM AUTHOR] |
|
Copyright of Astronomy Letters is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
Database: |
Academic Search Complete |
Full text is not displayed to guests. |
Login for full access.
|