Vol 11, No 10

Serendipitous discovery of warm absorbers in the Seyfert 2 galaxy IRAS 18325–5926

Shui-Nai Zhang, Qiu-Sheng Gu, Li Ji, Zhi-Xin Peng


Abstract Warm absorption is a common phenomenon in Seyfert 1s and quasars, but is rare in Seyfert 2s.We report the detection of warm absorbers with high energy resolution in the Seyfert 2 galaxy IRAS 18325–5926 for the first time with Chandra HETGS spectra. An intrinsic absorbing line system with an outflow velocity ~400 km s−1 was found, which is contributed by two warm absorbers with FWHM of 570 km s−1 and 1360 km s−1, respectively. The two absorbers were adjacent, and moving transversely across our line of sight. We constrained the distance between the center and the absorbers to be a small value, suggesting that the absorbers may originate from the highly ionized accretion disk wind ejected five years ago. The perspective of this type 2 Seyfert provides the best situation in which to investigate the vertical part of the funnel-like outflows. Another weak absorbing line system with zero redshift was also detected, which could be due to Galactic absorption with very high temperature or an intrinsic outflow with a very high velocity ~6000 km s−1.


Keywords galaxies: Seyfert — galaxies: absorption lines — X-rays: galaxies — galaxies: individual: IRAS 18325–5926

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