Orion Sii Exinct

02 Nov 2004

Discussion of significance of the following fact:

If I use the full extinction correction, as determined from the Hβ/radio study, then the SII map has bright bits everywhere the extinction is high. This indicates that we are overcorrecting for the extinction. In order for the map to come out more or less smooth in the dark bay, we need to apply only 0.7 times the nominal extinction (this is for the +004+024 slice).

What it means?

This seems to imply that much of the SII emission comes from in front of the dust absorption.

What else to try

We need to see what happens when we try it with different velocity ranges. One would naively expect that it would be the more blue-shifted emission that was in front of the absorbers. In that case, we would expect to need the full extinction correction for the red half of the lines. We'll have to see.