Stellar Spectral Signatures in High-Redshift Galaxies
Stellar emission and absorption lines are routinely observed in galaxies at redshifts up to 5 with spectrographs on 8-10m class telescopes. While the overall spectra are well understood and have been successfully modeled using empirical and theoretical libraries, some challenges remain. Three issues are discussed: determining abundances using stellar and interstellar spectral lines, understanding the origin of the strong, stellar He II 1640 line, and gauging the influence of stellar Lyman-alpha on the combined stellar+nebular profile. All three issues can be tackled with recently created theoretical stellar libraries for hot stars which take into account the radiation-hydrodynamics of stellar winds.
Reference: International Workshop on Stellar Spectral Libraries, Lyon (France), October 14 - 17, 2013. To be published in ASI Conference Series, 2014, Vol. 10, editors: H. P. Singh & P. Prugniel
Status: Conference proceedings