Séminaire/Seminar Galaxies |
| « The Mid-InfraRed Instrument (MIRI) freak show » |
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Pierre Guillard |
| The Mid-InfraRed Instrument (MIRI) onboard the James Webb Space Telescope (JWST) provide imaging, coronography, low and medium resolution spectro-imaging between 5 and 28 microns. I will review some of the aspects of the performances of the instrument, with a focus on two artefacts present in MIRI data: the so-called cruciform, a cross-shaped PSF artefact due to internal reflective diffraction off the pixel-defining metallic contacts to the readout detector circuit, and the so-called latents, a persistence in images taken after bright sources are observed. The magnitude of the persistence is a function of flux of the source of origin as well as the time spent observing that source. During latent characterization, we observed NGC 6552, an active galactic nucleus (AGN) at redshift 0.0266 classified as a Seyfert 2 nucleus in the optical, and Compton-thick AGN in X-rays. If time permits, I will present some first results, with a focus on the discovery of a high-ionization, AGN-powered, outflow from the nuclear region. |
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jeudi 6 octobre 2022 - 11:30 Salle du Conseil Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |