Ubiquitous column density variability in Seyfert 2 Galaxies

Details Ubiquitous column density variability in Seyfert 2 Galaxies Ubiquitous column density variability in Seyfert 2 Galaxies

2002-03-18

arxiv.org/abs/astro-ph/0203285v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, PASA, in press

Scientific paper

10.1071/AS01116

We present a study of X-ray column density variability in Seyfert 2 galaxies. We show that variations in N_H are observed in almost all the objects with multiple hard X-ray observations. Variation timescales (as short as a few months in several cases) are not in agreement with the standard scenario of a parsec-scale toroidal absorber. We propose that the X-ray absorber in Seyfert galaxies is located much nearer to the center than previously assumed, on the Broad Line Region Scale. An extension of the model by M. Elvis (2000) can explain the observed variability. We also show preliminary results of N_H variability search inside single X-ray observations, which suggest that variations can occur on timescales of a few 10^4 seconds.

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