Revealing structure and evolution within the corona of the Seyfert galaxy I Zw 1

Abstract

X-ray spectral timing analysis is presented of XMM-Newton observations of the narrow line Seyfert 1 galaxy I Zwicky 1 (I Zw 1) taken in 2015 January. After exploring the effect of background flaring on timing analyses, X-ray time lags between the reflection-dominated 0.3-1.0keV energy and continuum-dominated 1.0-4.0keV band are measured, indicative of reverberation off the inner accretion disc. The reverberation lag time is seen to vary as a step function in frequency; across lower frequency components of the variability, 3e-4 to 1.2e-3Hz a lag of 160s is measured, but the lag shortens to (59 +/- 4)s above 1.2e-3Hz. The lag-energy spectrum reveals differing profiles between these ranges with a change in the dip showing the earliest arriving photons. The low frequency signal indicates reverberation of X-rays emitted from a corona extended at low height over the disc while at high frequencies, variability is generated in a collimated core of the corona through which luminosity fluctuations propagate upwards. Principal component analysis of the variability supports this interpretation, showing uncorrelated variation in the spectral slope of two power law continuum components. The distinct evolution of the two components of the corona is seen as a flare passes inwards from the extended to the collimated portion. An increase in variability in the extended corona was found preceding the initial increase in X-ray flux. Variability from the extended corona was seen to die away as the flare passed into the collimated core leading to a second sharper increase in the X-ray count rate.

18 pages, 11 figures. Accepted for publication in MNRAS

References in corpus (9)

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• Acceleration and cooling of the corona during X-ray flares from the Seyfert galaxy I Zw 1
• Eclipsing the X-ray emitting region in the active galaxy NGC 6814
• Modelling the X-ray power spectra of AGN by using reprocessing echoes from an extended corona
• Discovery of soft and hard X-ray time lags in low-mass AGNs
• Characterising continuum variability in the radio-loud narrow-line Seyfert 1 galaxy IRAS 17020+4544
• Modeling the upper kHz QPOs of 4U 1728-34 with X-ray reverberation
• Supermassive Black Hole Spin and Reverberation