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We present a new analysis of the very first mid-infrared N-band long-baselineinterferometric observations of an extragalactic source: the nucleus of theSeyfert 2 galaxy NGC 1068, obtained with MIDI (Mid-InfrareD Interferometer),the mid-infrared beamcombiner at the European Southern Observatory (ESO) VeryLarge Telescope Interferometer (VLTI). The resolution of 10 mas allows to studythe compact central core of the galaxy between 8 and 13 microns. Bothvisibility measurements and MIDI spectrum are well reproduced with a simpleradiative transfer model with two concentric spherical components. The derivedangular sizes and temperatures are about 35 and 83 mas, and 361 K and 226 K forthese two components respectively. Some other evidences strongly support suchlow temperatures. This modeling also provides the variation of optical depth asa function of wavelength for the extended component across the N-band pointingtowards the presence of amorphous silicate grains. This shows that MIDIactually carried out the first direct observations of the distribution of dustaround the central engine. Together with other observational pieces, we areable to move a step forward in the reconstruction of the picture drawn forAGNs.Comment: 14 pages, 16 figure

A new analysis of the nucleus of NGC 1068 with MIDI observations