IGR J 11215-5952: searching for cyclotron lines in a SFXT pulsar

Supergiant Fast Xray Transient are a subclass of high mass Xray binariesshowing sporadic outbursts lasting only a few days, where most of the Xrayluminosity is concentrated in short (a few hours) Xray flares reaching1E361E37 erg/s. The driving mechanism is still highly debated, and involvesmodels predicting magnetarlike neutron star magnetic fields (1E14 G) versusmore typical values (1E12 G). IGRJ112155952 is the only SFXT with predictableoutbursts, being periodic with a 165 day orbital period. This allows us topropose a XMM and NuSTAR joint observation (20 ks) to search for a cyclotronline and directly determine the NS magnetic field. This will enable todisentangle among the currently available models. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]