Press Release
Free Access
Volume 558, October 2013
Article Number A58
Number of page(s) 13
Section Interstellar and circumstellar matter
Published online 03 October 2013

Online material

Appendix A: HIFI O2 spectrum

thumbnail Fig. A.1

Spectrum of Fig. 2 magnified over certain velocity ranges. In panel c) the O2 33–12 transition is shown. Identifications refer to the 7.0 km s-1 component.

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Table A.1

Overview of the other lines observed in the same spectrum.

Appendix B: RADEX calculations for C18O

The integrated intensity ratio of C18O 3–2/1–0 is equal to 0.74 for the 8.0 km s-1 component. This ratio can be analysed using the RADEX non-LTE excitation and radiative transfer program (van der Tak et al. 2007) to constrain the physical parameters. Figure B.1 presents the integrated intensity ratios as function of temperature and density, obtained for optically thin conditions. The observed ratio is indicated in dash-dotted lines.

thumbnail Fig. B.1

Left: schematic cartoon showing the scenario of O2 emission originating from the surrounding cloud. Right: integrated intensity ratios calculated with RADEX, as function of temperature and density, for a C18O column density of 5 × 1014 cm-2 (optically thin conditions). The C18O 3–2/1–0 ratio is relevant for the surrounding NGC 1333 cloud, which is traced by the 8.0 km s-1 component. Dash-dotted lines indicate the observed ratio of C18O 3–2/1–0 = 0.74 for the VLSR = 8.0 km s-1 component.

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© ESO, 2013

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