Articles written in Journal of Astrophysics and Astronomy

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


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      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.

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    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

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