WITNESSING THE BLOW-OUT PHASE IN THE CHANGING LOOK LOCAL QSO 2MASS 0918+2117

2MASS 0918+2117 is a type 1.5 QSO at z0.149. It was found to be unobscured in2000 by Chandra, obscured by Compton Thick material in 2003 by XMM andunobscured again by XMM in 2005, when there is evidence (at 3sigma) of anabsorption feature at 7 keV, indicating a disk wind with velocity of vout0.13c,with poorly constrained physical parameters. A faster wind (vout0.30.4c) maybe present at 10 keV, at the limit of the XMM response. These evidences suggestthat the source was caught in an obscuration and following blowout phase, inwhich powerful AGNdriven winds sweep away the obscuring material around theSMBH. We propose to observe the source for 60ks with Nustar (plus 50ks XMM) tofully characterize the wind at all energies, or study the absorber if the obscuration is recurrent. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]