Physical Properties of the Edge-On Ionization Front in the Trifid Nebula

Details Physical Properties of the Edge-On Ionization Front in the Trifid Nebula Physical Properties of the Edge-On Ionization Front in the Trifid Nebula

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541505n&link_type=abstract

American Astronomical Society, AAS Meeting #215, #415.05; Bulletin of the American Astronomical Society, Vol. 42, p.261

Astronomy and Astrophysics

Astronomy

Scientific paper

An edge-on ionization front in the Galactic H II region M20 was observed on two nights with the SOAR telescope. Grids of long-slit spectra were taken that include the Hα, Hβ and [S II] 6717, 6731 emission lines, which were used to determine the reddening correction, Hα surface brightness and electron density at thousands of points across the ionization front. The electron density is found to increase sharply to about 1000 cm-3 within the region of high Hα surface brightness. In addition, the [N II] 6548, 6583, and 5755 emission lines were used to determine the electron temperature across the ionization front. Our results are compared to those of Lefloch et al (2002) who used far-infrared and radio spectra.

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