Ercolano, B;
Storey, PJ;
(2006)
Theoretical calculations of the HI, HeI and HeII free-bound continuous emission spectra.
MON NOT R ASTRON SOC
, 372
(4)
1875 - 1878.
10.1111/j.1365-2966.2006.10988.x.
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Abstract
We present coefficients for the calculation of the continuous emission spectra of H I, He I and He II due to electron-ion recombination. Coefficients are given for photon energies from the first ionization threshold for each ion to the n = 20 threshold of hydrogen (36.5 mu m), and for temperatures 100 <= T <= 10(5) K. The emission coefficients for He I are derived from accurate ab initio photoionization data. The coefficients are scaled in such a way that they may be interpolated by a simple scheme with uncertainties less than 1 per cent in the whole temperature and wavelength domain. The data are suitable for incorporation into photoionization/plasma codes and should aid with the interpretation of spectra from the very cold ionized gas phase inferred to exist in a number of gaseous clouds.
| Type: | Article |
|---|---|
| Title: | Theoretical calculations of the HI, HeI and HeII free-bound continuous emission spectra |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1111/j.1365-2966.2006.10988.x |
| Keywords: | atomic data, TEMPERATURE-FLUCTUATIONS, PLANETARY-NEBULAE, RECOMBINATION, COEFFICIENTS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10066 |
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