1. Simultaneous EUV and X-ray variability of NGC 4051.
- Author
-
Uttley, P., MHardy, I.M., Papadakis, I.E., Cagnoni, I., and Fruscione, A.
- Subjects
GALAXIES ,X-ray astronomy ,ASTRONOMICAL observations - Abstract
We present a flux variability study of simultaneous RXTE and EUVE observations of the highly variable Seyfert galaxy NGC 4051. 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 Comptonization models for the production of the power-law continuum. A lag of <1 ks implies that the size of the Comptonizing region is less than 20 Schwarzschild radii for a black hole of mass >10[sup 6] M[sub ⊙]. [ABSTRACT FROM AUTHOR]
- Published
- 2000
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