Simultaneous EUV and X-ray variability of NGC 4051
Astrophysics
2009-10-31 v1
Abstract
We present a flux variability study of simultaneous RXTE and EUVE observations of the highly variable Seyfert galaxy NGC4051. We find a strong correlation between variability in the EUV and medium energy X-ray bands,indicating that both are sampling the same power-law continuum. The lag between the two bands is less than 20 ks and, depending on model assumptions, may be <1 ks. We examine the consequences of such a small lag in the context of simple Comptonisation models for the production of the power-law continuum. A lag of <1 ks implies that the size of the Comptonising region is less than 20 Schwarzschild radii for a black hole of mass >1E6 solar masses.
Keywords
Cite
@article{arxiv.astro-ph/9912103,
title = {Simultaneous EUV and X-ray variability of NGC 4051},
author = {P. Uttley and I. M. McHardy and I. E. Papadakis and I. Cagnoni and A. Fruscione},
journal= {arXiv preprint arXiv:astro-ph/9912103},
year = {2009}
}
Comments
8 pages, accepted for publication in MNRAS