In this section, we provide a table containing the self-shielding functions of N2 at 10, 100 and 1000 K (data for Fig. 6).
N2 self-shielding as a function of column density, N(N2), for excitation temperatures of 10, 100 and 1000 K.
Zoom-in of the high-resolution spectra of N2 (black line) and H plus H2 (red line) in the wavelength range of 911.75–930 Å for a thermal excitation temperature of 50 K. The column density of N2 is 1015 cm-2 and values for H2 and H are taken to be half of the observed column densities in the well-studied diffuse cloud toward ζ Oph, as is appropriate for the center of the cloud: N(H2) = 2.1 × 1020 and N(H) = 2.6 × 1020 cm-2. The model H2 Doppler width is 3 km s-1. Also shown is the H2 + H absorption spectrum (blue) toward ζ Oph using the observed column densities for individual J levels, showing non-thermal excitation of H2.
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© ESO, 2013