Velocity Structure in the Orion Nebula. II. Emission Line Atlas of Partially Ionized to Fully Ionized Gas

Abstract

We present an atlas of three-dimensional (position-position-velocity) spectra of the Orion Nebula in optical emission lines from a variety of different ionization stages: [O I] 6300, [S II] 6716,6731, [N II] 6584, [S III] 6312, H alpha 6563, and [O III] 5007. These transitions provide point to point information about the physical structure and kinematics of the nebula at an effective resolution of 3'' x 2'' x 10 km/s, clearly showing the large scale behavior of the ionized gas and the presence of localized phenomena such as Herbig-Haro outflows. As an example application of the atlas, we present a statistical analysis of the widths of the H alpha, [O III], and [N II] lines that permits a determination of the mean electron temperature in the nebula of (9200 +/- 400) K. We also find, in contradiction to previous claims, that the non-thermal line broadening is not significantly different between recombination lines and collisional lines.

34 pages, 22 figures, RevMexAA in press. High resolution figures and data available from http://www.astrosmo.unam.mx/~w.henney/orionatlas

Cited by in corpus (9)

• Properties of the ionized gas in HH202. II: Results from echelle spectrophotometry with UVES
• The $L-\sigma$ relation for massive bursts of star formation
• Independent Cosmological Constraints from high-z HII Galaxies
• The HII Galaxy Hubble Diagram Strongly Favors $R_{\mathrm{h}}=ct$ over $\Lambda$CDM
• Turbulence in simulated HII regions
• Turbulence in the Ionized Gas of the Orion Nebula
• Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy I: HH529II and III
• Structure and Physical Conditions in the Huygens Region of the Orion Nebula
• Internal kinematics of giant H II regions in M101 with the Keck Cosmic Web Imager