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We study in detail the mid-infrared Spitzer-IRS spectrum of M 87 in the range5 to 20 micron. Thanks to the high sensitivity of our Spitzer-IRS spectra wecan disentangle the stellar and nuclear components of this active galaxy. Tothis end we have properly subtracted from the M 87 spectrum, the contributionof the underlying stellar continuum, derived from passive Virgo galaxies in oursample. The residual is a clear power-law, without any additional thermalcomponent, with a zero point consistent with that obtained by high spatialresolution, ground based observations. The residual is independent of theadopted passive template. This indicates that the 10 micron silicate emissionshown in spectra of M 87 can be entirely accounted for by the underlying oldstellar population, leaving little room for a possible torus contribution. TheMIR power-law has a slope alpha ~ 0.77-0.82 (S$_\nu\propto\nu^{-\alpha}$),consistent with optically thin synchrotron emission.

The role of the synchrotron component in the mid infrared spectrum of M 87