An Empirical Ultraviolet Iron Spectrum Template Applicable to Active Galaxies
Iron emission is often a severe contaminant in optical-ultra- violet spectra of active galaxies. Its presence complicates emission line studies. A viable solution, already successfully applied at optical wave- lengths, is to use an empirical iron emission template. We have generated Fe ii and Fe iii templates for ultraviolet active galaxy spectra based on HST archival 1100-3100u spectra of IZw1. Their application allows fitting and subtraction of the iron emission in active galaxy spectra. This work has shown that in particular Ciii) �1909 can be heavily contam- inated by other line emission, including iron transitions. Details of the data processing, generation, and use of the templates, are given by Vester- gaard & Wilkes (2001).
Using ultrafast optical-pump terahertz-probe spectroscopy, we study the THz dynamics and electronic cooling in few-layer epitaxial and CVD graphene; a microscopic theory of carrier-carrier and carrier-phonon interactions accounts quantitatively for the observed dynamics.