• UV and X-ray Variability of Blazars

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    • Keywords


      Galaxies: active; galaxies: quasars; blazars; blazar: individual: PKS 2155–304.

    • Abstract


      It is well established that the blazars show flux variations in the complete electromagnetic (EM) spectrum on all possible time scales ranging from a few tens of minutes to several years. Here we report the review of various UV and X-ray flux variability properties of blazars. Our analysis show that UV variability amplitude is smaller than X-rays, mostly soft X-rays hardness ratio show correlations with blazar luminosity and different modes of variability might be operating for different time scales and epochs. Quasi periodic oscillations are seen on a few occasions in blazars, higher fraction of high energy peaked blazars show intra day and short term variabilities in X-rays but variability duty cycle is much less in optical bands on intra day time scale compared to low energy peaked blazars. But these results are yet to be established.

    • Author Affiliations


      Alok C. Gupta1

      1. Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital 263 129, India.
    • Dates

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