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IRAS 16547-4247 is the most luminous (6.2 x 10^4 Lsun) embedded young stellarobject known to harbor a thermal radio jet. We report the discovery usingVLT-ISAAC of a chain of H_2 2.12 um emission knots that trace a collimated flowextending over 1.5 pc. The alignment of the H_2 flow and the central locationof the radio jet implies that these phenomena are intimately linked. We havealso detected using TIMMI2 an isolated, unresolved 12 um infrared sourcetowards the radio jet . Our findings affirm that IRAS 16547-4247 is excited bya single O-type star that is driving a collimated jet. We argue that theaccretion mechanism which produces jets in low-mass star formation alsooperates in the higher mass regime.Comment: Accepted for publication in ApJL, 10 pages, 2 figure

A Parsec-Scale Flow Associated with the IRAS 16547-4247 Radio Jet