ProGeny I: a new simple stellar population generator and impact of isochrones / stellar atmospheres / initial mass functions

A. S. G. Robotham, S. Bellstedt

Published 2024-10-23Version 1

In this work we introduce ProGeny, a new stellar population library (SPL) software package written in R. This release encapsulates the core software to generate simple/single stellar populations (SSPs); the various data inputs required (in particular isochrones and stellar atmospheres); example scripts to generate the SSPs; and a number of pre-generated static SSP available forimmediate use.The mostnovelfeature ofProGeny is itsabilitytoproduce SSPs with evolving initial mass functions, allowing functional dependencies on stellar age or metallicity. We perform both internal comparisons (within the ProGeny SPL) and external comparisons (with other public SSPs) and tests. The main conclusion is that the choice of isochrone has significantly more impact on the predicted spectra than the choice of stellar atmospheres and/or IMF (comparing Chabrier and Kroupa variants). A number of limiting uncertaintiesand corrections forstarformationrates andstellar massesare alsopresented.