Monitoring of the extreme alpha_ox variations in the luminous NL QSO PHL 1092

Details Monitoring of the extreme alpha_ox variations in the luminous NL QSO PHL 1092 Monitoring of the extreme alpha_ox variations in the luminous NL QSO PHL 1092

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop..137m&link_type=abstract

XMM-Newton Proposal ID #06538401

Physics

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Phl 1092

Scientific paper

During a 2008 XMM-Newton observation the luminous Narrow-Line quasar PHL 1092 showed a dramatic X-ray flux drop by a factor ~200 with respect to previous X-ray observations, becoming one of the most extreme X-ray weak QSO (alpha_ox = -2.44), after being X-ray "normal" (alpha_ox = -1.56) only 4.5 years earlier. Note that the extreme 2008 X-ray weakness corresponds to a factor ~320 with respect to the expected X-ray flux of QSO with the given luminosity. The aim of this proposal is to continue our UV and X-ray monitoring of this extreme source with two 25 ks exposures (one for each visibility window, hence separated by about 6 months) to unveil the timescale over which transitions from X-ray weak to normal QSO states take place in this most extraordinary AGN.

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