Are strongly variable Seyfert 2 galaxies really AGN without a Broad Line Region?

Computer Science

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Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Q2130-431, Q2131-427, Xmm-Newton Proposal 04024604

Scientific paper

Strong amplitude optical brightness variability has been found in a sample of Seyfert 2 galaxies ("Naked AGN", Hawkins 2004). The variability suggests that the nuclear source is seen directly, contradicting the complete absence of broad emission lines as simple Unified Models for AGN would predict. Alternatively the Broad Line Region might be missing in these sources. The proposed XMM-Newton observations offer a priviledged window into the central engine to understand the absorption properties of these objects and compare them to their optical appearance.

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