MIDI Sees Active Galactic Nuclei
作者： W Jaffe , D Raban , K Meisenheimer , K Tristram , Ch Leinert
DOI: 10.1007/978-1-4020-9190-2_15
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摘要: One of the primary motivations for building VLTI was to observe inner, dusty regions Active Galactic Nuclei (AGNs). Although is limited relatively bright objects, there are a dozen or so Seyfert galaxies, and at least one quasar, that enough see. These only extragalactic targets far observed with optical/infrared interferometers. The mid-Infrared instrument, MIDI, spectroscopic instrument working in N-band (8–14 μ) which corresponds peak emission from blackbodies ∼ 300 K. With few exceptions, example some cases synchrotron emission, MIDI has mostly been used warm dust near this temperature. For AGNs questions concerning related unified theories attempt reduce bewildering number AGN types by attributing many their characteristics obscuration nuclear structure, perhaps toroidal form, characteristic size parsec so. This scale determined typical UV luminosity an core, 1044 erg s−1, need keep cooler than its sublimation temperature, 1500 nearest distances 10 Mpc direct measurement morphology then requires resolution order milliarcsec (mas). Single telescope observations have shown mid-IR SEDs prove existence there, but attempts constrain nature torus these proved difficult. Thus motivation interferometric measurements image structures determine shape, size, temperature orientation respect axes galaxy, radio larger ionization structures. We also hoped learn something about chemistry shape silicate feature μ possibly degree inhomogeneity “clumpiness”. crudest taxonomic classification divides into “Type 1” where seen face-on, 2” it edge-on. In first case we expect see core as unresolved point source surrounded near-circular disk. second would disk be flattened.
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