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      The long term X-ray time-lags of NGC 4051

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          Abstract

          We present the long term, frequency-dependent, X-ray time lags of the Seyfert galaxy NGC 4051. We used Rossi X-ray Timing Explorer light curves in the 2-4, 4-7 and 7-10 keV bands and we measured the time-lags at \(10^{-7}-10^{-6}\) Hz. This is the lowest frequency range that AGN time-lags have ever been measured. The variations in the higher energy bands are delayed with respect to the variations we observe at 2-4 keV, in agreement with the time-lags at high frequencies. When we combine our results with those from the model fitting of the time lags at higher frequencies we find that that the X-ray hard lags in NGC 4051 follow a power law of slope \(\sim -1\) over a broad frequency range, from \(\sim 10^{-7}\) to \(\sim 10^{-3}\) Hz. This is consistent with the time-lags of Cyg X-1, a result which further supports the analogy between active galaxies and Galactic X-ray black hole binaries.

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          Author and article information

          Journal
          12 March 2019
          Article
          1903.05031
          19d14c78-5443-4e1d-835e-125ecb74a912

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          Accepted for publication in MNRAS
          astro-ph.HE astro-ph.GA

          Galaxy astrophysics,High energy astrophysical phenomena
          Galaxy astrophysics, High energy astrophysical phenomena

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