The Excited and Exciting ISM in Galaxies: PDRs, XDRs ... - Caltech
The Excited and Exciting ISM in Galaxies: PDRs, XDRs ... - Caltech
The Excited and Exciting ISM in Galaxies: PDRs, XDRs ... - Caltech
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<strong>XDRs</strong>: E > 1 keV<br />
Heat<strong>in</strong>g: X-ray photo-ionization --><br />
fast electrons - Coulomb heat<strong>in</strong>g<br />
H <strong>and</strong> H 2vib excitation - UV<br />
Cool<strong>in</strong>g: [FeII] 1.26, 1.64; [OI] 63;<br />
[CII] 158; [SiII] 35 µm; thermal H 2vib; gas-dust<br />
1 keV photon penetrates 10 22 cm -2 of N H<br />
Heat<strong>in</strong>g efficiency ~ 10 – 50 %
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