Free Access
Volume 555, July 2013
Article Number A14
Number of page(s) 18
Section Interstellar and circumstellar matter
Published online 19 June 2013

Online material

Appendix A: self-shielding functions

In this section, we provide a table containing the self-shielding functions of N2 at 10, 100 and 1000 K (data for Fig. 6).

Table A.1

N2 self-shielding as a function of column density, N(N2), for excitation temperatures of 10, 100 and 1000 K.

Appendix B: High resolution spectra

In this section, we provide the high resolution spectra of N2 at 50 K (zoom in for Fig. 4). The H2 and H column densities are the same as those used in Fig. 4.

thumbnail Fig. B.1

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.

Open with DEXTER

thumbnail Fig. B.2

As Fig. B.1, but for 930–950 Å.

Open with DEXTER

thumbnail Fig. B.3

As Fig. B.1, but for 950–970 Å.

Open with DEXTER

thumbnail Fig. B.4

As Fig. B.1, but for 970–990 Å.

Open with DEXTER

thumbnail Fig. B.5

As Fig. B.1, but for 990–1000 Å.

Open with DEXTER

© ESO, 2013

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.