Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-04
Astronomy and Astrophysics
Astrophysics
34 pages, 22 figures, RevMexAA in press. High resolution figures and data available from http://www.astrosmo.unam.mx/~w.henney
Scientific paper
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.
Doi Takumi
García-Díaz Ma.-T.
Henney William J.
Lopez Jose Alberto
Парфенов Г. П.
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