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First millimeter mapping of the jet and nucleus of M87

V. Despringre, D. Fraix-Burnet, E. Davoust
Laboratoire d'Astrophysique de Grenoble, BP 53X, F-38041 Grenoble Cédex, France
Laboratoire d'Astrophysique, Observatoire Midi-Pyrénées, 14 Avenue Edouard Belin, 31400 Toulouse, France
Abstract: Observations of M87 at 89 GHz (3.4 mm) 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 (). 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 7 appears around the nucleus, which we were not able to attribute to an artifact. It is elongated perpendicular to the jet and its offset from the nucleus is symmetric to that of the well known H emission-line features in M87. If interpreted as very cold gas ( K), this extended structure would then have a total mass of .
Astronomy & Astrophysics, in press

Figure 10: Grey map of M87 with contour level spacing of 35 mJy/beam and a peak intensity of 1.67 Jy/beam. The beamwidth is at PA=22.