Warm absorbers in Narrow-Line Seyfert 1 galaxies

Details Warm absorbers in Narrow-Line Seyfert 1 galaxies Warm absorbers in Narrow-Line Seyfert 1 galaxies

1998-10-07

arxiv.org/abs/astro-ph/9810105v1

New Astron.Rev. 44 (2000) 483-485

Astronomy and Astrophysics

Astrophysics

6 pages incl. 2 figures (needs paspconf.sty), to appear in the proc. of "High Energy Processes in Accreting Black Holes" (Swed

Scientific paper

10.1016/S1387-6473(00)00084-1

Warm absorbers are an important new tool for investigating the conditions within the central regions of active galaxies. They have been observed in ~50% of the well-studied Seyfert galaxies and have also been detected in quite a number of Narrow-line Seyfert 1 galaxies (NLSy1). Here, we present a study of the X-ray properties of several NLSy1s with focus on their warm absorbers: (a) An analysis of all ROSAT PSPC observations of NGC 4051 including new ones is performed, which reveals variability by a factor ~30 in count rate and much less variability in the warm absorber parameters. (b) The possibility of a dusty warm absorber in IRAS 13349+2438 is explored on the basis of photoionization models for dusty warm gas and explicit ROSAT spectral fits. (c) The X-ray spectrum of the NLSy1 1E0117.2-2837 is analyzed. It can be successfully described by a very steep powerlaw of photon index G_x = -4, or alternatively by a warm-absorbed flat powerlaw. UV-EUV emission lines expected to arise from the warm material are predicted. (d) The strong spectral variability of RX J0134.3-4258 (from G_x = -4.4 in the ROSAT survey observation, to ~ -2.2$ in our subsequent pointing) is examined in terms of warm absorption.

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