Discovery of high-frequency iron K lags in Ark 564 and Mrk 335
Jun 11, 201310 pages
Published in:
- Mon.Not.Roy.Astron.Soc. 434 (2013) 1129
e-Print:
- 1306.2551 [astro-ph.HE]
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Abstract: (arXiv)
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 s 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.Note:
- 10 pages, 12 figures, accepted for publication in MNRAS
References(74)
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