@inproceedings{discovery1420273, booktitle = {Proceedings of 'An INTEGRAL view of the high-energy sky (the first 10 years)' - 9th INTEGRAL Workshop and celebration of the 10th anniversary of the launch (INTEGRAL 2012)}, title = {Multiwavelength campaign on Mrk 509: testing realistic comptonization models}, year = {2012}, note = {{\copyright} 2012 The Authors. Publication available under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 licence (CC BY-NC-SA) described at http://creativecommons.org/licenses/by-nc-sa/3.0/.}, pages = {--}, abstract = {Mrk 509 was observed by XMM-Newton and INTEGRAL in October/November 2009, with one observation every four days for a total of ten observations. Each observation has been fitted with a realistic thermal Comptonization model for the continuum emission. Prompted by the correlation between the UV and soft X-ray flux, we used a thermal Comptonization component for the soft X-ray excess. The UV to X-ray/gamma-ray emission of Mrk 509 can be well fitted by these components, pointing to the existence of a hot (kT {$\sim$} 100 keV), optically-thin ({\ensuremath{\tau}} {$\sim$} 0.5) corona producing the primary continuum. In contrast, the soft X-ray component requires a warm (kT {$\sim$} 1 keV), optically-thick ({\ensuremath{\tau}} {$\sim$} 10-20) plasma. Estimates of the amplification ratio for this warm plasma support a configuration relatively close to the "theoretical" configuration of a slab corona above a passive disk. This plasma could be the warm upper layer of the accretion disk. In contrast, the hot corona has a more photon-starved geometry. The high temperature ({$\sim$} 100 eV) of the soft-photon field entering and cooling it favors a localization of the hot corona in the inner flow. This soft-photon field could be part of the comptonized emission produced by the warm plasma.}, author = {Branduardi Raymont, G and Petrucci, PO and Paltani, S and Malzac, J and Kaastra, J and Cappi, M and Ponti, G and de Marco, B and Kriss, G and Steenbrugge, K and Bianchi, S and Mehdipour, M and Costantini, E and Dadina, M and Lubinski, P}, url = {http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=176} }