Post on 12-Sep-2021
Extragalactic Astronomy Ac.Yr. 2003 - 2004
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Astronomia Extragalattica2003
II part Lecture 1. Morphology continue
Prof. Guido ChincariniOrdinario Milano Bicocca &
Emerito Osservatorio Astronomico di Brera
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M31
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NGC 4051
NGC 4151
NGC 1068
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NGC 7469
NGC 3565
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Markarian thumbnails
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3C
273
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The Dusty Torus
At about 100 light years from the singularity we detect a “Donut”composed of dust and gas, the donut is called the molecular torus.
A very similar feature has been detected by the Hubble Space Telescope in the Seyfert Galaxy NGC 4261.
The Torus is optically thick:
That is if located along the line of sight it absorbs the light coming from the internal regions and only the emission of the torus itself, mainly in the Infrared, and the emission coming from the outermost regions can be detected
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modello unificato, schema riassuntivo
IR Emission – The dusty torus
UV & Optical Emission – Accretion disk
Gamma & X ray Emission / Radio EmissionRelativistic jets
Optical Emission – NLR e BLR
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421
–
broad
band
spect