2003/10/17 by G. Matt, Giorgio Matt, Stefano Bianchi +5
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Atomic physics #Emission spectrum #Energetic neutral atom #Equivalent width #Flux (metallurgy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Ion #Ionization #Line (geometry) #Materials science #Nuclear physics #Optics #Physics #Plasma #Reflector (photography) #Spectral line #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20031635
published as Astron.Astrophys. 414 (2004) 155-161 · accepted for publication in A&A
arxiv created 2003/10/17 · openalex publication_date 2004/01/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present and discuss the high energy ( keV) XMM–Newton spectrum of the Seyfert 2 galaxy, NGC 1068. Possible evidence for flux variability in both the neutral and ionized reflectors with respect to a BeppoSAX observation taken 3.5 years before is found. Several Fe and Ni emission lines, from both neutral and highly ionized material, are detected. The intensity of the iron Kα Compton shoulder implies that the neutral reflector is Compton–thick, likely the visible inner wall of the cm-2 absorber. From the equivalent width of the ionized iron lines a column density of a few cm-2 is deduced for the hot ionized reflector. Finally, an iron (nickel) overabundance, when compared to solar values, of about 2 (4) with respect to lower Z elements, is found.