Sengi

Sengi uses a number of different Stellar Population Synthesis (SPS) models. Each of these is described in brief below, in particular the parameter configuration chosen for each grid. Further details are given in the associated paperm, and we also link to each model source.

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Binary Population and Spectral Synthesis (BPASS)

We generate two grids, one including the effects of binaries and the other without. We use version 2.2.1, using a Chabrier IMF with a 300 M_☉ high-mass cutoff.

Version 2.2.1 is available here, and described in detail in Eldridge et al. 2017

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Flexible Stellar Population Synthesis (FSPS)

We generate two grids, one including the effects of nebular emission and the other without. Both grids use the MILES stellar isochrones, and assume a Kroupa IMF with a 120 M_☉ high-mass cutoff.

For further details see Conroy, Gunn & White 2009, Conroy & Gunn 2010. The nebular emission modelling is described in Byler et al. 2017. python-FSPS, available here, provides convenient python bindings to the underlying Fortran code, and was used for generating our grids.

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Galaxev (BC03)

We use the original 2003 version to generate a single grid, using the Padova isochrones and a Chabrier IMF with a 100 M_☉ high-mass cutoff..

The models are available here, and described in detail in Bruzual & Charlot 2003.

Image: Melanie Schubert.