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arXiv · 1506.00586

Multi-band variability in the blazar 3C 273 with XMM-Newton

Nibedita Kalita·Alok C. Gupta·Paul J. Wiita·Jai Bhagwan·Kalpana Duorah
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Abstract

We have undertaken a nearly simultaneous optical/UV and X-ray variability study of the flat spectrum radio quasar, 3C 273 using data available from the XMM$-$Newton satellite mission from June 2000 to July 2012. Here we focus on the multi-wavelength flux variability on both intra-day and long time scales of this very well known radio-loud source. We found high flux variability over long time scales in all bands for which observations were made. The optical/UV variability amplitude was more than twice than that in the X-ray bands. There is some frequency dependence of the variability in optical/UV bands in the sense that the variability amplitude increases with increasing frequency; however, the X-ray emissions disagree with this trend as the variability amplitude decreases from soft to hard X-ray bands. On intra-day time scales 3C 273 showed small amplitude variability in X-ray bands. A hardness ratio analysis in the X-ray regime indicates that the particle acceleration mechanism dominates the cooling mechanism during most of the ~12 year span of these observations.

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Nibedita Kalita, Alok C. Gupta, Paul J. Wiita, Jai Bhagwan, Kalpana Duorah. 2015-06-01. Multi-band variability in the blazar 3C 273 with XMM-Newton. https://arxiv.org/abs/1506.00586

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