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Catalogue POP – Notice individuelle de publication

Poncelet Anne, Doucet C., Perrin Guy, Sol Hélène, Lagage Pierre-Olivier

An original interferometric study of NGC 1068 with VISIR BURST mode images

Astronomy and Astrophysics, 2007, vol. 472, pp. 823-831

Référence ADS : 2007A&A...472..823P

Résumé :

Context: We present 12.8 mum images of the core of NGC 1068, the archetype Seyfert type II galaxy, obtained during first operations of the BURST mode of the VLT/VISIR (Imager and Spectrometer in the InfraRed at the Very Large Telescope). <BR />Aims: We trace structures under the diffraction limit of one UT (Unit Telescope at the VLT) and we investigate the link between dust in the vicinity of the central engine of NGC 1068, recently resolved by interferometry with MIDI (Mid-InfrareD Interferometer), and more extended structures. This step is mandatory for a multi-scale understanding of the sources of mid-infrared emission in active galactic nuclei (AGN). <BR />Methods: A speckle processing of VISIR BURST mode images was performed to extract very low spatial-frequency visibilities, first considering the full field of VISIR BURST mode images and then limiting it to the mask used for the acquisition of MIDI data. <BR />Results: Extracted visibilities are reproduced with a multi-component model. We identify two major sources of emission at 12.8 mum: a compact one

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