Browsing by Subject "Active galactic nuclei"

Browsing by Subject "Active galactic nuclei"

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    Suzaku observations of ‘bare’ active galactic nuclei 
    Walton, D. J.; Nardini, E.; Fabian, A. C.; Gallo, Luigi C.; Reis, R. C. (Oxford University Press, 2013-02)
    We present an X-ray spectral analysis of a large sample of 25 ‘bare’ active galactic nuclei (AGN), sources with little or no complicating intrinsic absorption, observed with Suzaku. Our work focuses on studying the potential ...

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    Towards modelling X-ray reverberation in AGN: piecing together the extended corona 
    Wilkins, D. R.; Cackett, E. M.; Fabian, A. C.; Reynolds, C. S. (Oxford University Press, 2016-05-01)
    Models of X-ray reverberation from extended coronae are developed from general relativistic ray tracing simulations. Reverberation lags between correlated variability in the directly observed continuum emission and that ...

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    Using wavelet analysis to study AGN x-ray variability 
    Ghosh, Akshay (Halifax, N.S. : Saint Mary's University, 2023-08-01)
    In this work, we examine the application of the wavelet transform to the X-ray timing analyses of active galactic nuclei (AGN) and quasi-periodic eruption sources (QPEs). We find that the power spectral density (PSD) slope ...

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    X-ray spectral and variability properties of low-mass active galactic nuclei 
    Ludlam, R. M.; Cackett, E. M.; Gultekin, K.; Fabian, A. C.; Gallo, Luigi C.; Miniutti, G. (Oxford University Press, 2015-03)
    We study the X-ray properties of a sample of 14 optically selected low-mass active galactic nuclei (AGN) whose masses lie within the range 10[superscript 5]–2 × 10[superscript 6] M[subscript circled dot] with XMM–Newton. ...

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    XMM-Newton observations of the narrow-line Seyfert 1 galaxy Mrk 335 in a historical low X-ray flux state 
    Gallo, Luigi C.; Grupe, Dirk; Komossa, Stefanie; Fabian, Andrew C.; Larsson, Josefin; Pradhan, Anil K.; Xu, Dawei; Miniutti, Giovanni (American Astronomical Society, 2008-07)
    We report the discovery of strong soft X-ray emission lines and a hard continuum above 2 keV in the narrow-line Seyfert 1 galaxy Mrk 335 during an extremely low X-ray flux state. Mrk 335 was observed for 22 ks by XMM-Newton ...