• Measurement of coronal properties of Seyfert galaxies from NuSTAR’s hard X-ray spectrum

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      https://www.ias.ac.in/article/fulltext/joaa/039/01/0015

    • Keywords

       

      Galaxies: active—galaxies: Seyfert—galaxies: quasars: individual (3C 120 , NGC 4151).

    • Abstract

       

      Precise measurement of the coronal properties of Active Galactic Nuclei (AGN) requires the availability of high signal-to-noise ratio data covering awide range of X-ray energies.The Nuclear Spectroscopic Telescope Array ($NuSTAR$) which is highly sensitive to earlier missions in its operational energy range of 3–79 keV, allows us to arrive at precise estimates of the coronal parameters such as cut-off energy ($E_{\rm cut}$), coronaltemperature ($kT_e$) and geometry of the corona at least for sources that have $E_{\rm cut}$ within the energy range of$NuSTAR$. In this paper,we present our preliminary results on the spectral analysis of two Seyfert galaxies namely 3C 120 and NGC 4151 using $NuSTAR$ observations in the 3–79 keV band. We investigated the continuum and coronal parameters, the photon index $\Gamma$, $E_{\rm cut}$ and $kT_e$. By fitting the X-ray spectrum of 3C 120 and NGC 4151 with a simple phenomenological model, we found that both the sources showed a clear cut-off in their spectrum.

    • Author Affiliations

       

      PRIYANKA RANI1 C. S. STALIN1

      1. Indian Institute of Astrophysics, Koramangala, Bangalore 560 034, India.
    • Dates

       
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