Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 434, Issue 2, Pages 1129-1137Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1055
Keywords
black hole physics; galaxies: active; X-rays: galaxies
Categories
Funding
- ESA
- NASA
- STFC [ST/J001538/1, ST/F00723X/1, ST/K000985/1, ST/J001600/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J001600/1, ST/F00723X/1, ST/K000985/1, ST/J001538/1] Funding Source: researchfish
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We use archival XMM-Newton observations of Ark 564 and Mrk 335 to calculate the frequency-dependent time lags for these two well-studied sources. We discover high-frequency Fe K lags in both sources, indicating that the red wing of the line precedes the rest-frame energy by roughly 100 and 150 s for Ark 564 and Mrk 335, respectively. Including these two new sources, Fe K reverberation lags have been observed in seven Seyfert galaxies. We examine the low-frequency lag-energy spectrum, which is smooth, and shows no feature of reverberation, as would be expected if the low-frequency lags were produced by distant reflection off circumnuclear material. The clear differences in the low- and high-frequency lag-energy spectra indicate that the lags are produced by two distinct physical processes. Finally, we find that the amplitude of the Fe K lag scales with black hole mass for these seven sources, consistent with a relativistic reflection model where the lag is the light travel delay associated with reflection of continuum photons off the inner disc.
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