How SFRIs vary with methods of sampling the IMF and duplicity

Details How SFRIs vary with methods of sampling the IMF and duplicity How SFRIs vary with methods of sampling the IMF and duplicity

2010-08-07

arxiv.org/abs/1008.1352v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

8 pages, 4 figures, to appear in "UP: Have Observations Revealed a Variable Upper End of the Initial Mass Function?", Astronom

Scientific paper

Using our new Binary Population and Spectral Synthesis (BPASS) code we explore the affect of binary populations on the integrated spectra of galaxies. We also explore the interplay of binary populations and a varying maximum stellar mass. We compare our synthetic populations to observations of H$\alpha$ emission from isolated clusters and H$\alpha$ and FUV observations of galaxies. We find that observations tend to favour a pure stochastic sampling of the initial mass function although the evidence is not significant. We also find that binaries make a stellar population less susceptible to the stochastic effects of filling the IMF. Therefore making it more difficult to determine if there is a variable maximum stellar mass.

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