X-ray spectral variability in PG 1535+547: the changing look of a “soft X-ray weak” AGN

2008/02/20 by L. Ballo, M. Giustini, N. Schartel +7 · 1 citation
Physics and Astronomy · #Accretion (finance) #Accretion disc #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Context (archaeology) #Flux (metallurgy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Geometry #Line (geometry) #Optics #Physics #QSOS #ROSAT #Redshift #Spectral line #X-ray #astro-ph

paper · pdf · doi:10.1051/0004-6361:20079075

14 pages, 7 figures, A&A latex manuscript; accepted for publication in Astronomy & Astrophysics

arxiv created 2008/02/20 · openalex publication_date 2008/03/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Context. PG 1535+547 is a bright Narrow Line Seyfert 1 galaxy, whose high-energy emission shows strong variability both in shape and flux. On the basis of ROSAT observations, it is classified as “soft X-ray weak quasi-stellar object (QSO)”, a class of objects whose X-ray-to-optical flux ratio is smaller than in typical QSOs. Their X-ray spectra are often characterized by highly-ionized, complex absorbers and/or reflection from the inner accretion disk, and the relative importance of the two is currently debated. Whatever the correct interpretation may be, the presence of such features implies that we are looking at matter located in the innermost regions of these AGN.

Citations

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