%0 Generic %A Branduardi Raymont, G %A Petrucci, PO %A Paltani, S %A Malzac, J %A Kaastra, J %A Cappi, M %A Ponti, G %A de Marco, B %A Kriss, G %A Steenbrugge, K %A Bianchi, S %A Mehdipour, M %A Costantini, E %A Dadina, M %A Lubinski, P %D 2012 %F discovery:1420273 %P - %T Multiwavelength campaign on Mrk 509: testing realistic comptonization models %U https://discovery.ucl.ac.uk/id/eprint/1420273/ %X 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 ∼ 100 keV), optically-thin (τ ∼ 0.5) corona producing the primary continuum. In contrast, the soft X-ray component requires a warm (kT ∼ 1 keV), optically-thick (τ ∼ 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 (∼ 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. %Z © 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/.