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

Serendipitous discovery of warm absorbers in the

Seyfert 2 galaxy IRAS 18325-5926

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

【期刊名称】《天文和天体物理学研究》 【年(卷),期】2011(011)010

【摘要】Warm absorption is a common phenomenon in Seyfert 1 s 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. 【总页数】14页(1171-1184)