Martin Stuhlinger
XMM-Newton

Starting with my PhD I'm working on the long term X-ray variability
of  quasars. Most of my research was addressed to the radio loud
quasar 3C  273, as for this source already about 30 years of X-ray
observations are  available, the same for any other band of the
el.mag. spectrum from  radio to TeV. Time variability studies allow
to investigate the  propagation of changes in the physical
conditions and to get an idea of  the spatial sizes of the
corresponding emitting regions.

The newest field of research is a XMM-Newton observation of the
wind  accreting X-ray pulsar Vela X-1 coming out of its eclipse,
joining the  group of PI Peter Kretschmar.