1997/07/07 by Stefanie Komossa, S. Komossa, Komossa, Stefanie +3
Physics and Astronomy · #Advanced X-ray Imaging Techniques #Astrophysical Phenomena and Observations #Astrophysics (astro-ph) #FOS: Physical sciences #X-ray Spectroscopy and Fluorescence Analysis #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9707071
8 pages incl. 5 figures, accepted for publication in A&A
arxiv created 1997/07/07 · openalex publication_date 1997/07/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
An analysis of survey and pointed ROSAT PSPC observations of the Seyfert 1.8 galaxy NGC 3786 has revealed interesting spectral and temporal behaviour. The spectrum is found to show clear signs of excess absorption, and there is evidence that part (or all) of it is caused by the presence of a warm absorber. The soft X-ray spectral properties are discussed in the context of the Sy 1.8 classification of NGC 3786, and are combined with published optical data in an effort to discriminate between several possible absorption models. The one involving a warm absorber with internal dust, located between BLR and NLR, is favoured and shown to account successfully for the high observed broad line reddening as well as for the strong X-ray variability (a factor ∼ 10) we detect between the 1990 and 1992 observation.