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Nebular Emission

Emission Line Fluxes for v2.1

In Xiao, Stanway & Eldridge (2018, MNRAS, 477, 904) we have investigated the nebular emission lines that arise from our model stellar populations in greater detail. We present the collated models used in that paper here.

The README PDF and tar files of the optical and UV emission lines can be found at this link:

Other emission lines not included in these files can be obtained by contacting Dr Xiao directly.


Note: Unfortunately, figure B1 in Xiao et al went to press with incorrect axis labels. This plot shows CIV/HeII, not [CIII]/HeII. Our apologies for any confusion this has caused. 



Nebula Emission Line Fluxes - v2.0

BPASS produces stellar continuum emission. We caution that, in astrophysical contexts, this is reprocessed by dust and nebular gas before detection, and that our models should be similarly processed.

We recommend the use of a radiative transfer code such as CLOUDY or MAPPINGS to do this.

We have been wary of providing a processed data set, since there is considerable uncertainty on the physical range of nebular gas parameters and it is important to distinguish between uncertainties in the stellar models and those in their later reprocessing.

In published work (e.g. Stanway et al 2014) and our earlier work on BPASS v1.1 (below) we have used CLOUDY v13.03 and defined a default set of nebular gas parameters as follows:

  • gas metallicity follows stellar metallicity,
  • log(electron density)=2,
  • covering fraction=1,
  • spherical geometry, inner radius=10 pc.

Input files for CLOUDY with these parameters can be generated in IDL using this code. The code can be modified for other gas properties as required.

Nebula Emission Line Fluxes - v1.1

Nebula emission line fluxes versus age for different metallicities and single/binary populations, calculated by Cloudy.



Stellar Emission Line Fluxes - v1.1

Stellar emission line fluxes versus age for different metallicities and single/binary populations, calculated from the models. Included as equivalent widths and line luminosities for C(IV), He(II) and the Wolf-Rayet Blue & Red bumps.



License: The results from BPASS and CURVEPOPS available on this site licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Creative Commons License

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