A longer XMM-Newton look at I Zwicky 1: Distinct modes of X-ray spectral variability

Abstract

The short-term spectral variability of the narrow-line Seyfert 1 galaxy I Zwicky 1 (I Zw 1) as observed in an 85 ks XMM-Newton observation is discussed in detail. I Zw 1 shows distinct modes of variability prior to and after a flux dip in the broad-band light curve. Before the dip the variability can be described as arising from changes in shape and normalisation of the spectral components. Only changes in normalisation are manifested after the dip. The change in the mode of behaviour occurs on dynamically short timescales in I Zw 1. The data suggest that the accretion-disc corona in I Zw 1 could have two components that are co-existing. The first, a uniform, physically diffuse plasma responsible for the "typical'' long-term (e.g. years) behaviour; and a second compact, centrally located component causing the rapid flux and spectral changes. This compact component could be the base of a short or aborted jet as sometimes proposed for radio-quiet active galaxies. Modelling of the average and time-resolved rms spectra demonstrate that a blurred Compton-reflection model can describe the spectral variability if we allow for pivoting of the continuum component prior to the dip.

arXiv comment8 pages, 9 figures. Accepted by MNRAS

References in corpus (37)

• X-ray Properties of Black-Hole Binaries
• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• A fundamental plane of black hole activity
• A universal radio/X-ray correlation in low/hard state black hole binaries
• Active Galactic Nuclei as scaled-up Galactic black holes
• A light bending model for the X-ray temporal and spectral properties of accreting black holes
• A jet model for the broadband spectrum of XTE J1118+480: Synchrotron emission from radio to X-rays in the Low/Hard spectral state
• X-ray Spectral Variability and Rapid Variability of the Soft X-ray Spectrum Seyfert 1 Galaxies Ark 564 and Ton S180
• GRS 1915+105 and the Disc-Jet Coupling in Accreting Black Hole Systems
• Plasma Ejection from Magnetic Flares and the X-ray Spectrum of Cygnus X-1
• A long hard look at MCG-6-30-15 with XMM-Newton
• XMM-EPIC observation of MCG-6-30-15: Direct evidence for the extraction of energy from aspinning black hole?
• An unstable central disk in the superluminal black-hole X-ray binary GRS 1915+105
• Spectral Transitions in Cyg X-1 and Other Black Hole X-Ray Binaries
• A Long, Hard Look at the Low-Hard State in Accreting Black Holes
• Boundary layer, accretion disk and X-ray variability in luminous LMXBs
• Aborted jets and the X-ray emission of radio-quiet AGNs
• X-ray reflection in the NLS1 1H 0707-495
• ROSAT monitoring of persistent giant and rapid variability in the narrow-line Seyfert 1 galaxy IRAS 13224-3809
• The radio properties of radio-quiet quasars
• The radio properties of radio-quiet quasars
• The nature of X-ray spectral variability in Seyfert Galaxies
• ROSAT HRI Monitoring of Extreme X-ray Variability in the Narrow-Line Quasar PHL 1092
• Mapping the inner regions of MCG-6-30-15 with XMM-Newton
• On the origin of the various types of radio emission in GRS 1915+105
• Long-term spectral changes in the partial-covering candidate NLS1 1H 0707-495
• Electron-Positron Outflows from Gamma-Ray Emitting Accretion Discs
• Bimodal spectral variability of Cygnus X-1 in an intermediate state
• Polarization signatures of strong gravity in AGN accretion discs
• Energy-dependent variability and the origin of the soft X-ray excess in AGN
• The Energy-dependent X-ray Timing Characteristics of the Narrow Line Seyfert 1 Mkn 766
• Dependencies of QSO Lyman-alpha absorption line statistics on cosmological parameters
• The X-ray variability of the Narrow-Line Seyfert 1 galaxy IRAS 13224-3809 from an XMM-Newton observation
• Polarization change due to fast winds from accretion disks
• IZw1 observed with XMM-Newton: Low-energy spectral complexity, iron lines, and hard X-ray flares
• A longer XMM-Newton look at I Zwicky 1: Variability of the X-ray continuum, absorption, and iron Kalpha line
• Energy-dependent variability from accretion flows

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