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Deep 21-cm HI line observations of the Virgo cluster spiral galaxy NGC 4569have been obtained with the VLA in its D configuration and with the Effelsberg100-m telescope. A low surface density arm was discovered in the west of thegalaxy, whose velocity field is distinct from that of the overall diskrotation. The observed gas distribution, velocity field, and velocitydispersion are compared to snapshots of dynamical simulations that include theeffects of ram pressure. Two different scenarios were explored: (i) ongoingstripping and (ii) a major stripping event that took place about 300 Myr ago.It is concluded that only the post-stripping scenario can reproduce the mainobserved characteristics of NGC 4569. It is not possible to determine if thegas disk of NGC 4569 had already been truncated before it underwent the rampressure event that lead to its observed HI deficiency.Comment: 13 pages, 15 figures. Accepted for publication in A&

NGC 4569: Recent evidence for a past ram pressure stripping event