New reverberation mapping measurements of the size of the optical iron emission-line region in quasars are provided, and a tentative size-luminosity relation for this component is reported. Combined with lag measurements in low-luminosity sources, the results imply an emission-region size that is comparable to and at most twice that of the Hβ line, and is characterized by a similar luminosity dependence. This suggests that the physics underlying the formation of the optical iron blends in quasars may be similar to that of other broad emission lines.
@article{arxiv.1404.6142,
title = {A Tentative Size-Luminosity Relation for the Iron Emission-Line Region in Quasars},
author = {Doron Chelouche and Stephen E. Rafter and Gabriel I. Cotlier and Shai Kaspi and Aaron J. Barth},
journal= {arXiv preprint arXiv:1404.6142},
year = {2014}
}