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Browsing by Author "Priyanka Rani"

Browsing by Author "Priyanka Rani"

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  • Hard X-ray flux variations in AGN from NuSTAR 
    Priyanka Rani; Stalin, C. S (Astronomical Society of India, 2015-04)
    We present here our results on the hour like time scale Xray flux variations in a sample of active galactic nuclei using data from the Nuclear Spectroscopic Telescope Array (NuSTAR). We find that in the 3−79 keV band, ...
  • Measurement of coronal properties of Seyfert galaxies from NuSTAR’s hard X-ray spectrum 
    Priyanka Rani; Stalin, C. S (Indian Academy of Sciences, 2018-02)
    Precise measurement of the coronal properties of Active Galactic Nuclei (AGN) requires the availability of high signal-to-noise ratio data covering a wide range of X-ray energies. The Nuclear Spectroscopic Telescope Array ...
  • NuSTAR spectral analysis of three Seyfert galaxies: NGC 3227, NGC 5548, and MR 2251−178 
    Pal, Indrani; Stalin, C. S; Mallick, L; Priyanka Rani (EDP Sciences, 2022-06)
    Context. The observed nuclear X-ray emission in the radio-quiet category of active galactic nuclei (AGN) is believed to be from a compact region, the corona, which is situated in the vicinity of central supermassive black ...
  • Study of X-ray variability and coronae of Seyfert galaxies using NuSTAR 
    Priyanka Rani; Stalin, C. S; Goswami, K. D (Oxford University Press on behalf of the Royal Astronomical Society, 2019-04)
    The primary X-ray emission in active galactic nuclei (AGNs) originates in a compact region called the corona located very close to the supermassive black hole and the accretion disc. The knowledge of the cut-off energy ...
  • Temporal and spectral characteristics of active galactic nuclei in X-rays using NuSTAR 
    Priyanka Rani (Indian Institute of Astrophysics, 2019-02)
    Flux variability is one of the defining characteristics of active galactic nuclei (AGN). This has been known over the past six decades ever since the discov- ery of quasars in 1963. Since then AGN have been observed ...
  • X-ray flux variability of active galactic nuclei observed using NuSTAR 
    Priyanka Rani; Stalin, C. S; Rakshit, S (Oxford University Press on behalf of the Royal Astronomical Society, 2017-04)
    We present results of a systematic study of flux variability on hourly time-scales in a large sample of active galactic nuclei (AGN) in the 3−79 keV band using data from Nuclear Spectroscopic Telescope Array. Our sample ...

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