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Ten Years of Monitoring 3C 273 with XMM–Newton

Zhang, Youhong; Liu, Liu

We present ten years optical/UV/X-ray observations of 3C 273 performed using XMM–Newton between 2000 and 2009. The short-time scale variability behaviour of the soft and hard X-ray light curves may suggest different origins of the soft/hard X-ray emissions. We fit well the 0.2–10 keV X-ray spectrum with a hard power-law component plus a soft Compt…

Chandra and XMM–Newton Observations of H₂O Maser Galaxy Mrk 266

Wang, J.; Fan, J. H.; Zhang, J. S.

For H₂O megamaser galaxy Mrk 266, its Chandra and XMM–Newton data are analyzed here. It shows existence of two obscured nuclei (separation is ~ 5^″). Our preferred model, the high energy reflected model can fit the hard component of both nuclei spectra well.

Spectral Evolution of Synchrotron and Inverse Compton Emission in BL Lac Objects

Zhang, You-Hong

With XMM–Newton observations, the X-ray spectral variations and the derived physical implications for two very high energy gamma-ray BL Lac objects PKS 2155–304 and S5 0716+714 are presented.