Variable absorption in BAL QSOs: catching the origin of AGN winds

Details Variable absorption in BAL QSOs: catching the origin of AGN winds Variable absorption in BAL QSOs: catching the origin of AGN winds

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop..190g&link_type=abstract

XMM-Newton Proposal ID #05562309

Physics

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Pg 1351+640, Pg 1351+640, Pg 2233+134, Pg 1126-041, Pg 2302+029, Xmm-Newton Proposal Id #05562309

Scientific paper

We want to investigate the nature of the gas located in the central regions of QSOs. Hence, we propose to observe a small sample of four BAL QSOs, among the X-ray brightest in the Palomar Green sample. Our goal is to monitor the variability of their absorption properties to study the physics of the wind seen in BAL QSOs along the line of sight. As such, timescales of days and years must be investigated to probe distances between tens to thousands gravitational radii from the central SMBH. To this end, each source must have been observed at least three times by XMM-Newton (in at least 2 close pointings for the intra-day variability plus a distant one for the intra-year variability). We thus request that XMM-Newton re-observes some BAL QSOs for a total of 240 ks.

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