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What is the origin of the soft excess in AGN?
Malgorzata Sobolewska, Chris Done
We investigate the nature of the soft excess below 1 keV observed in AGN. We use the XMM-Newton data of the low redshift, optically bright quasar, PG 1211+143, and we compare it wi…
High redshift radio quiet quasars -- exploring parameter space of accretion models. Part II: patchy corona model
M. A. Sobolewska, A. Siemiginowska, P. T. Zycki
We modeled the spectral energy distribution (SED) of high redshift radio quiet quasars (high-z RQQs). We computed spectra in a patchy corona geometry where an accretion disk extend…
High redshift radio quiet quasars - exploring the parameter space of accretion models. Part I: hot semi-spherical flow
M. A. Sobolewska, A. Siemiginowska, P. T. Zycki
Two families of models are currently considered to describe an accretion flow onto black holes and production of the observed X-ray radiation: (1) a standard cold accretion disk wi…