• radio-quiet pulsar

Pulsars are natural laboratories of extreme physics, with densities of the order of nuclear matter and strong magnetic fields. They are fundamental in testing high energy emission mechanisms, as well as in studying fundamental physics. New results about the peculiarities of these sources could provide better constraints to magnetospheric emission models: for instance, many gamma-ray pulsars do not feature associated radio or X-ray pulsed emission. It is still unclear whether the lack of detection in some energy bands is related to observational limits rather than to the geometric configuration or to the emission processes at the source.
PSR J1809-2332 is a radio-quiet pulsar with observed P ~146.8ms and Ṗ ~ 34.5 x 10^(−15) s/s, whose gamma-ray detection confirmed the hypotheses of pulsar wind nebula proposed in previous years on the nature of an extended unidentified gamma-ray source. The situation at X-ray energies is less clear: to date, even if an associated X-ray Chandra point source exists, no X-ray periodicity has been detected.
In the thesis I present an updated study on the X-ray emission of J1809 and its associated
pulsar wind nebula based on an XMM-Newton observation, to better characterize this source
and its high-energy emission in the 0.3-10 keV range. In a multiwavelength context, I present also an X-ray periodicity search based on parallel Fermi-LAT observation of the pulsar.