The variable hard x-ray emission of NGC 4945 as observed by NUSTAR

Simonetta Puccetti, Andrea Comastri, Fabrizio Fiore, Patricia Arevalo, Guido Risaliti, Franz E. Bauer, William N. Brandt, Daniel Stern, Fiona A. Harrison, David M. Alexander, Steve E. Boggs, Finn Erland Christensen, William W. Craig, Poshak Gandhi, Charles J. Hailey, Michael J. Koss, George B. Lansbury, Bin Luo, Greg M. Madejski, Giorgio MattDominic J. Walton, Will Zhang

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    We present a broadband (~0.5-79 keV) spectral and temporal analysis of multiple NuSTAR observations combined with archival Suzaku and Chandra data of NGC 4945, the brightest extragalactic source at 100 keV. We observe hard X-ray (>10 keV) flux and spectral variability, with flux variations of a factor of two on timescales of 20 ks. A variable primary continuum dominates the high-energy spectrum (>10 keV) in all states, while the reflected/scattered flux that dominates at E
    Original languageEnglish
    Article number26
    JournalAstrophysical Journal
    Issue number1
    Number of pages17
    Publication statusPublished - 2014


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