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Evidence for both red- and blue-shifted absorption lines due to ionized Fe inthe X-ray spectrum of the Seyfert 1 galaxy Mrk 509 are reported. These featuresappear to be transient on time-scales as short as ~20 ks, and have beenobserved with two different satellites, BeppoSAX and XMM-Newton. The red- andblue-shifted lines are found at E~5.5 keV and ~8.1-8.3 keV (rest-frame),respectively. The first is seen in one out of six BeppoSAX observations, thelatter is seen by both satellites. Under the assumption that the absorption isdue to either H- or He-like Iron, the implied velocities for the absorbingmatter are v~0.15-0.2 c, in both outward and inward directions. An alternativeexplanation in terms of gravitational red-shift for the ~5.5 keV line cannot beruled out with the current data. We argue, however, that the temporal patternsand sporadic nature of the lines are more easily reconciled with models whichpredict important radial motions close to the central black hole, such as the``aborted jet'' model, the ``thundercloud'' model, or magneto-hydrodynamicalmodels of jets and accretion-disks.Comment: 9 pages, 3 tables, 10 figures, accepted for publication in A&

X-ray absorption lines suggest matter infalling onto the central black-hole of Mrk 509