Backscattering and line broadening in Orion
Examination of emission lines in high-velocity-resolution optical spectra of the Orion Nebula confirms that the velocity component on the red wing of the main ionization front emission line is due to backscattering in the Photon Dominated Region. This scattered light component has a weak wavelength...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
2023
|
| In: |
The astronomical journal
Year: 2023, Volume: 165, Issue: 1, Pages: 1-11 |
| ISSN: | 1538-3881 |
| DOI: | 10.3847/1538-3881/ac9f44 |
| Online Access: | Resolving-System, kostenfrei, Volltext: https://doi.org/10.3847/1538-3881/ac9f44 Verlag, kostenfrei, Volltext: https://iopscience.iop.org/article/10.3847/1538-3881/ac9f44 
|
| Author Notes: | C.R. O’Dell, G.J. Ferland, and J.E. Méndez-Delgado |
| Summary: | Examination of emission lines in high-velocity-resolution optical spectra of the Orion Nebula confirms that the velocity component on the red wing of the main ionization front emission line is due to backscattering in the Photon Dominated Region. This scattered light component has a weak wavelength dependence that is consistent with either general interstellar medium particles or particles in the foreground of the Orion Nebula Cluster. An anomalous line-broadening component that has been known for 60+ years is characterized in unprecedented detail. Although this extra broadening may be due to turbulence along the line of sight of our spectra, we explore the possibility that it is due to Alfvén waves in conditions where the ratio of magnetic and thermal energies are about equal and constant throughout the ionized gas. |
|---|---|
| Item Description: | Online veröffentlicht am 19. Dezember 2022 Gesehen am 22.02.2023 |
| Physical Description: | Online Resource |
| ISSN: | 1538-3881 |
| DOI: | 10.3847/1538-3881/ac9f44 |