On the driver of relativistic effects strength in Seyfert galaxies

Abstract

Spectroscopy of X-ray emission lines emitted in accretion discs around supermassive black holes is one of the most powerful probes of the accretion flow physics and geometry, while also providing in principle observational constraints on the black hole spin.[...] We aim at determining the ultimate physical driver of the strength of this relativistic reprocessing feature. We first extend the hard X-ray flux-limited sample of Seyfert galaxies studied so far (FERO, de la Calle Perez et al. 2010) to obscured objects up to a column density N_H=6x10^23 atoms/cm/cm. We verify that none of the line properties depends on the AGN optical classification, as expected from the Seyfert unification scenarios. There is also no correlation between the accretion disc inclination, as derived from formal fits of the line profiles, and the optical type or host galaxy aspect angle, suggesting that the innermost regions of the accretion disc and the host galaxy plane are not aligned. [...]. Data are not sensitive enough to the detailed ionisation state of the line-emitting disc. However, the lack of dependency of the line EW on either the luminosity or the rest-frame centroid energy rules out that disc ionisation plays an important role on the EW dynamical range in Seyferts. The dynamical range of the relativistically broadened K-alpha iron line EW in nearby Seyferts appears to be mainly determined by the properties of the innermost accretion flow. We discuss several mechanisms (disc ionisation, disc truncation, aberration due to a mildly relativistic outflowing corona) which can explain this. [...] Observational data are still not in contradiction with scenarios invoking different mechanisms for the spectral complexity around the iron line, most notably the "partial covering" absorption scenario. (abridged).

Accepted for publication on Astronomy & Astrophysics. 14 pages, 9 figures

References in corpus (30)

• An XMM-Newton survey of broad iron lines in Seyfert galaxies
• Constraining Black Hole Spin Via X-ray Spectroscopy
• Relativistic X-ray Lines from the Inner Accretion Disks Around Black Holes
• Occultation measurement of the size of the X-ray emitting region in the Active Galactic Nucleus of NGC 1365
• Broad iron K-alpha emission lines as a diagnostic of black hole spin
• A Compton-thick Wind in the High Luminosity Quasar, PDS 456
• Cosmic Evolution of Mass Accretion Rate and Metalicity in Active Galactic Nuclei
• An absorption origin for the X-ray spectral variability of MCG-6-30-15
• XMM-Newton study of the complex and variable spectrum of NGC 4051
• X-ray Absorption and Reflection in Active Galactic Nuclei
• Seyfert galaxies in the local Universe (z$\le$ 0.1): the average X-ray spectrum as seen by $BeppoSAX$
• On the Iwasawa-Taniguchi effect of radio-quiet AGN
• Multi-dimensional modelling of X-ray spectra for AGN accretion-disk outflows III: application to a hydrodynamical simulation
• FERO: Finding Extreme Relativistic Objects. I. Statistics of Relativistic Fe Kalpha lines in Radio-Quiet Type 1 AGN
• The variable X-ray spectrum of Markarian 766 - I. Principal components analysis
• Fe K Emission and Absorption in the XMM-EPIC Spectrum of the Seyfert Galaxy IC 4329a
• X-ray reverberation in 1H0707-495 revisited
• Iron line profiles in Suzaku spectra of bare Seyfert galaxies
• Relativistic spectral features from X-ray illuminated spots and the measure of the black hole mass in AGN
• Dynamics of Rotating Accretion Flows Irradiated by a Quasar
• Evidence for relativistic features in the X-ray spectrum of Mrk 335
• On the evidence for narrow, relativistically shifted X-ray lines
• Evidence for a Truncated Accretion Disc in the Low Luminosity Seyfert Galaxy, NGC 7213?
• The relativistic shift of narrow spectral features from black-hole accretion discs
• 4U 1344-60: a bright intermediate Seyfert galaxy at z=0.012 with a relativistic Fe Kalpha emission line
• The messy environment of Mrk 6
• On the light-bending model of X-ray variability of MCG-6-30-15
• The broad-band X-ray spectrum of the Seyfert 1 galaxy, MCG+8-11-11
• On the peculiar properties of the narrow-line quasar PG 1543+489
• RBS1423 - a new QSO with relativistic reflection from an ionised disk

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