We propose a study project, carried out by an international team, aimed at deciphering the outflow properties of the bright Seyfert 1 galaxy NGC5548. The project is based on an ambitious multi-wavelength campaign on NGC5548 for which we were approved in year 2012 a Large Program (14×50 ks) with XMM-Newton, 12 joint HST/COS orbits, 41×1.5 ks with SWIFT and 245 ks of Chandra/HETGS. Simultaneous hard X-ray observations with Nustar are also foreseen. The campaign started before the Summer 2013 (Swift started in May 17th, XMM in June 22nd) and lasted for >80 days in total. The main scientific goal of this large project is to determine unambiguously the location, geometry and physical properties of the various absorption (wind/outflow) and emission (accretion disc, corona) components in this source. The international team covers the whole range of expertise needed for such a study: data reduction (at all wavelengths, from the optical-UV to the hard X-ray band), data analysis, data interpretation and theoretical simulations/modeling. The goal of this study project is to discuss at ISSI the observational results, their possible interpretations, as well as to define, coordinate and plan the writing of several scientific papers expected to result from the above campaign.

The whole proposal is also available here.

The first paper from this campaign is published here:

“A fast and long-lived outflow from the supermassive black hole in NGC 5548”, J. S. Kaastra et al, Science, 19 June 2014 (10.1126/science.1253787)