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dc.contributor.authorPriyanka Rani-
dc.contributor.authorStalin, C. S-
dc.contributor.authorRakshit, S-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Vol. 466, No. 3, pp. 3309-3322en_US
dc.descriptionRestricted Accessen_US
dc.description.abstractWe 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.publisherOxford University Press on behalf of the Royal Astronomical Societyen_US
dc.rights© Royal Astronomical Society-
dc.subjectGalaxies: activeen_US
dc.subjectBL lacertae objects: generalen_US
dc.subjectGalaxies: jetsen_US
dc.subjectGalaxies: nucleien_US
dc.subjectGalaxies: Seyferten_US
dc.subjectX-rays: galaxiesen_US
dc.titleX-ray flux variability of active galactic nuclei observed using NuSTARen_US
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