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A global look at X‐ray time lags in Seyfert galaxies
Author(s) -
Kara E.,
Alston W.,
Fabian A.
Publication year - 2016
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201612332
Subject(s) - physics , supermassive black hole , astrophysics , galaxy , reverberation mapping , black hole (networking) , accretion (finance) , amplitude , x ray , light curve , active galactic nucleus , reverberation , accretion disc , lag , astronomy , optics , computer network , routing protocol , routing (electronic design automation) , computer science , acoustics , link state routing protocol
X‐ray reverberation, where light‐travel time delays map out the compact geometry around the inner accretion flow in supermassive black holes, has been discovered in several of the brightest, most variable and well‐known bare Seyfert galaxies. In this work, we expand the study of X‐ray time lags to all Seyfert galaxies in the XMM‐ Newton archive above a nominal rms and exposure level. We find that reverberation is found in >50 % of sources (with >99 % confidence). We also find that the low‐frequency hard lag (which is likely associated with the coronal emission) is found in >80% of sources, suggesting that most sources with X‐ray variability show intrinsic variability from the nuclear region. We update the known iron K lag amplitude vs. black hole mass relation. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)