Energy Dependent time lags in the Seyfert 1 galaxy NGC 4593

Abstract

We investigate the energy-time lag dependence of the source NGC 4593 using XMM-{\it Newton}/EPIC-pn data. We found that the time lag dependency is linear in nature with respect to the logarithm of different energy bands. We also investigate the frequency dependent time lags and identify that at some frequency range (5 $\times$ 10${}^{-5}$ Hz -- 2 $\times$ 10${}^{-4}$ Hz) the X-ray emission is highly coherent, mildly frequency dependent and very strongly energy dependent. These observations can be explained in the frame work of the thermal Comptonization process and they indicate a truncated accretion disk very close to the black hole. We discuss the plausible spectral state to explain the phenomenon and conclude that the observed properties bear a close resemblance to the intermediate state or the steep power-law state, found in galactic black hole sources.

arXiv commentaccepted for the publication in The Astrophysical journal, 5 pages

References in corpus (36)

• X-ray Properties of Black-Hole Binaries
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• Modelling the behaviour of accretion flows in X-ray binaries
• Active Galactic Nuclei as scaled-up Galactic black holes
• RXTE Observation of Cygnus X-1: II. Timing Analysis
• The evolution of the timing properties of the black-hole transient GX 339-4 during its 2002/2003 outburst
• Black Hole Mass Estimates from Reverberation Mapping and from Spatially Resolved Kinematics
• On the X-ray time lags in the black hole candidates
• Combined Long and Short Timescale X-ray Variability of NGC4051 with RXTE and XMM-Newton
• X-ray Fluctuation Power Spectral Densities of Seyfert 1 Galaxies
• X-Ray Variability Coherence: How to Compute it, What it Means, and How it Constrains Models of Cyg X-1 and GX 339-4
• MCG-6-30-15: Long Timescale X-Ray Variability, Black Hole Mass and AGN High States
• Temporal Properties of Cygnus X-1 During the Spectral Transitions
• X-ray continuum variability of MCG-6-30-15
• Discovery of multiple Lorentzian components in the X-ray timing properties of the Narrow Line Seyfert 1 Ark 564
• The Relationship Between Black Hole Mass and Velocity Dispersion in Seyfert 1 Galaxies
• An optically thick inner corona geometry for the Very High State Galactic Black Hole XTE J1550-564
• Frequency-dependent time lags in the X-ray emission of the Seyfert galaxy NGC 7469
• Scaling variability from stellar to supermassive black holes
• Spectral-timing evidence for a Very High State in the Narrow Line Seyfert 1 Ark 564
• RXTE Observation of Cygnus X--1: III. Implications for Compton Corona and ADAF Models
• X-ray Variability of the Seyfert 1 Markarian 335: Power Spectrum and Time Lags
• Detection of a high frequency break in the X-ray power spectrum of Ark 564
• The Energy-dependent X-ray Timing Characteristics of the Narrow Line Seyfert 1 Mkn 766
• The Spectral Energy Distribution and Emission-Line properties of the NLS1 Galaxy Arakelian 564
• What can we learn about quasars from alpha_OX measurements in galactic black hole binaries?
• X-ray Variability Characteristics of the Seyfert 1 Galaxy NGC 3783
• Iron Line Spectroscopy of NGC4593 with XMM-Newton: Where is the Black Hole Accretion Disk?
• Low-Luminosity AGN as analogues of Galactic Black Holes in the low/hard state: Evidence from X-ray timing of NGC 4258
• Hard X-ray Lags in Cygnus X-1
• Timing evidence in determining the accretion state of the Seyfert galaxy NGC 3783
• Anti-correlated hard X-ray time lags in Galactic black hole sources
• High redshift radio quiet quasars -- exploring parameter space of accretion models. Part II: patchy corona model
• Discovery of hard X-ray delays in the X-ray emission of the Seyfert 1 galaxy Mrk~110: possible evidence for Comptonization
• An X-ray Spectral Analysis of the Central Regions of NGC 4593
• Possible Evidence for a Truncated Thin Disk in Seyfert 1 Galaxy NGC4593

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