1996A&A...309..375D

Observations of M 87 at 89GHz (3.4mm) with the IRAM Plateau de Bure interferometer are presented. This is the first image of an extragalactic jet at this frequency with such a resolution (2.9"x1.8"). Knots A, B, C and G in the jet are clearly seen. The photometry of the knots reveals that, within the error bars, the millimetric intensity is that expected from a linear interpolation between the radio and optical values. An extended feature of about 13"x7" appears around the nucleus, which we were not able to attribute to an artifact. It is elongated perpendicular to the jet and its offcentering from the nucleus is symmetric to that of the well known H_α emission-line features in M 87. If interpreted as very cold gas (T≲10K), this extended structure would then have a total mass of ≃10¹²M_☉.