Time lags in Narrow-line Seyfert 1 galaxies and the origin of their soft excess emission

Abstract

The origin of soft X-ray excess emission from type 1 active galactic nuclei has remained a major problem for the last two decades. It has not been possible to distinguish alternative models for the soft excess emission despite the excellent data quality provided by XMM-Newton and Chandra. Here we present observations of time lags between the soft and hard band X-ray emission and discuss the implications to the models for the soft excess. We also device a method to distinguish the models for the soft excess using Suzaku's broadband capability.

arXiv comment4 pages, To appear in the conference proceedings "The Extreme Universe in the Suzaku Era" (Progress of Theoretical Physics, Supplement)