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27 August 2010

Predicted UV properties of very metal-poor starbursts

Authors:  Raiter, Schaerer, Fosbury
Link to article: arXiv:1008.2114

The properties of the rest-frame UV emission from low-metallicity starbursts are studyied in detail, with the aim of providing a basis for the interpretation of observations of high redshift galaxies in which zero or low-metallicity stars are forming.  A number of important effects are included, which were not accounted for in the earlier work of Schaerer (2002) on the emission properties of low-metallicity galaxies.  Among these are that the nebular line emission can be enhanced appreciably when particularly massive, hot stars are illuminating the gas within the galaxy.  The authors also pay particular attention to the impact that 2-photon emission can have on the equivalent widths of emission lines, especially Ly_alpha and He II 1640.  


  1. Jarrett said . . .

    This is a very nice update of the much-cited and influential earlier work of Schaerer (2002). In particular, it is useful in that the important new physics that is included here can be accounted for by others using some simple fitting formulae that the authors provide.

  2. The paper makes very nice predictions on the change in the star formation rate-UV-relation. The results suggest that SFRs are mostly overestimated at high-z for low metallicity populations. This will have quite some impact on high-z galaxy studies. It would be very interesting to see how the SFR-stellar mass relation changes adopting these corrections, and if it stills shows no evolution at z > 4.