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X-ray flux variability of active galactic nuclei observed using NuSTAR

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dc.contributor.author Priyanka Rani
dc.contributor.author Stalin, C. S
dc.contributor.author Rakshit, S
dc.date.accessioned 2020-11-17T14:10:25Z
dc.date.available 2020-11-17T14:10:25Z
dc.date.issued 2017-04
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 466, No. 3, pp. 3309-3322 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7122
dc.description Restricted Access © Royal Astronomical Society https://doi.org/10.1093/mnras/stw3228 en_US
dc.description.abstract 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 consists of four BL Lac objects (BL Lacs), three flat spectrum radio quasars (FSRQs) 24 Seyfert 1, 42 Seyfert 2 and eight narrow line Seyfert 1 (NLSy1) galaxies. We find that in the 3−79 keV band, about 65 per cent of the sources in our sample show significant variations on hourly time-scales. Using the Mann–Whitney U-test and the Kolmogorov–Smirnov test, we find no difference in the variability behaviour between Seyfert 1 and 2 galaxies. The blazar sources (FSRQs and BL Lacs) in our sample are more variable than Seyfert galaxies that include Seyfert 1 and Seyfert 2 in the soft (3−10 keV), hard (10−79 keV) and total (3−79 keV) bands. NLSy1 galaxies show the highest duty cycle of variability (87 per cent), followed by BL Lacs (82 per cent), Seyfert galaxies (56 per cent) and FSRQs (23 per cent). We obtained flux doubling/halving time in the hard X-ray band less than 10 min in 11 sources. The flux variations between the hard and soft bands in all the sources in our sample are consistent with zero lag. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en_US
dc.subject Galaxies: active en_US
dc.subject BL lacertae objects: general en_US
dc.subject Galaxies: jets en_US
dc.subject Galaxies: nuclei en_US
dc.subject Galaxies: Seyfert en_US
dc.subject X-rays: galaxies en_US
dc.title X-ray flux variability of active galactic nuclei observed using NuSTAR en_US
dc.type Article en_US


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