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astro-ph2008★ 37 cited
On the absorption of X-ray bright broad absorption line quasars
Margherita Giustini, Massimo Cappi, Cristian Vignali
Most X-ray studies of BALQSOs found significant (N_H~10^{22-24} cm^{-2}) intrinsic column densities of gas absorbing an underlying typical power-law continuum emission, in agreemen…
astro-ph2008★ 43 cited
X-ray spectral variability in PG1535+547: the changing-look of a 'soft X-ray weak' AGN
L. Ballo, M. Giustini, N. Schartel +5
PG1535+547 is a bright NLS1 galaxy, whose high energy emission shows strong variability in shape and flux. ROSAT data classified it as soft X-ray weak QSO (objects whose X-ray-to-o…