2008/03/04 by T. J. Turner, J. N. Reeves, S. B. Kraemer +1 · 2 citations
Physics and Astronomy · #Absorption (acoustics) #Accretion disc #Active galactic nucleus #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Emission spectrum #Galaxies: Formation, Evolution, Phenomena #Reflection (computer programming) #Spectral line #Spectral signature #Tracing #astro-ph
paper · pdf · doi:10.1051/0004-6361:20078808
10 pages, 8 figures, accepted by A&A Feb 26 2008 Version 2: Figs 1 & 2 were corrected for a problem with ACIS section of the data. Little impact on text of the paper
openalex publication_date 2008/03/04 · arxiv created 2008/03/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Context. X-ray spectra of AGN often contain signatures indicative of absorption in multiple layers of gas whose ionization-state and covering fraction may vary with time. It has been unclear to date how much of the observed X-ray spectral and timing behavior in AGN can be attributed to variations in absorption, versus variations in the strengths of emission or reflection components. Diagnostics of the inner regions of AGN cannot be reliably performed until the origin of observed effects is understood.