2017/09/01 by Xiao-Dan Fu, Shui-Nai Zhang, Wei Sun +2 · 6 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Ionization #Joint (building) #Photoionization #Spectral line #Stellar, planetary, and galactic studies #Torus #astro-ph.HE
paper · pdf · doi:10.1088/1674-4527/17/9/95
published in Research in Astronomy and Astrophysics 17(9), 095 (IOP Publishing) · 14 pages, 10 figures
openalex created_date 2017/08/31 · openalex publication_date 2017/09/01 · arxiv created 2017/12/19 · arxiv updated 2017/12/20 · openalex updated_date 2026/08/08
Abstract Warm Absorbers (WAs), as an important form of AGN outflows, show absorption in both the UV and X-ray bands. Using XSTAR generated photoionization models, for the first time we present a joint fit to the simultaneous observations of HST /COS and Chandra /HETG on NGC 3783. A total of five WAs explain well all absorption features from the AGN outflows, which are spread over a wide range of parameters: ionization parameter log ξ from 0.6 to 3.8, column density log <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>N</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant="normal">H</mml:mi> </mml:mrow> </mml:msub> </mml:math> from 19.5 to 22.3 cm −2 , velocity v from 380 to 1060 km s −1 , and covering factor from 0.33 to 0.75. Not all the five WAs are consistent in pressure. Two of them are likely different parts of the same absorbing gas, and two of the other WAs may be smaller discrete clouds that are blown out from the inner region of the torus at different periods. The five WAs suggest a total mass outflowing rate within the range of 0.22–4.1 solar mass per year.