Velocity structure in the orion nebula. ii. emission line atlas of partially ionized to fully ionized gas
We present an atlas4 of three-dimensional (position-position-velocity) spectraof the Orion Nebula in optical emission lines from a variety of different ionizationstages: [O I] 6300˚A, [S II] 6716,6731˚A, [N II] 6584˚A, [S III] 6312˚A, Hα 6563˚A,a...
| Authors: | , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2008 |
| Country: | México |
| Institution: | Universidad Nacional Autónoma de México |
| Repository: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:57144114 |
| Online Access: | https://www.redalyc.org/articulo.oa?id=57144114 |
| Access Level: | Open access |
| Keyword: | Física, Astronomía y Matemáticas H II regions ISM: Herbig Haro objects ISM: individual: Orion nebula techniques: spectroscopy turbulence |
| Summary: | We present an atlas4 of three-dimensional (position-position-velocity) spectraof the Orion Nebula in optical emission lines from a variety of different ionizationstages: [O I] 6300˚A, [S II] 6716,6731˚A, [N II] 6584˚A, [S III] 6312˚A, Hα 6563˚A,and [O III] 5007˚A. These transitions provide point to point information aboutthe physical structure and kinematics of the nebula at an effective resolution of3´´ × 2´´ × 10 km s−1, clearly showing the large scale behavior of the ionized gasand the presence of localized phenomena such as Herbig-Haro outflows. As anexample application of the atlas, we present a statistical analysis of the widths ofthe Hα, [OIII], and [N II] lines that permits a determination of the mean electrontemperature in the nebula of (9200 ± 400) K. We also find, in contradiction toprevious claims, that the non-thermal line broadening is not significantly differentbetween recombination lines and collisional lines. |
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