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It has been proposed that the supermassive black hole candidates at thecenters of galaxies might be wormholes formed in the early Universe andconnecting our Universe with other sister Universes. The analysis of theprofile of the relativistic K$\alpha$ iron line is currently the only availableapproach to probe the spacetime geometry around these objects. In this paper, Icompute the expected K$\alpha$ iron line in some wormhole spacetimes and Icompare the results with the line produced around Kerr black holes. The lineproduced in accretion disks around non-rotating or very slow-rotating wormholesis relatively similar to the one expected around Kerr black holes with mid orhigh value of spin parameter and current observations are still marginallycompatible with the possibility that the supermassive black hole candidates ingalactic nuclei are these objects. For wormholes with spin parameter $a_*\gtrsim 0.02$, the associated K$\alpha$ iron line is instead quite differentfrom the one produced around Kerr black holes, and their existence may alreadybe excluded.

Broad K$\alpha$ iron line from accretion disks around traversable wormholes