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--- courses:ast403:unified-model [2026/03/07 21:05] – shuvo
+++ courses:ast403:unified-model [2026/03/07 22:00] (current) – [Observational Evidence for Unification] shuvo
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 *   **Relativistic Jets:** In some AGNs, highly collimated beams of plasma are ejected at near-light speeds along the rotation axis of the accretion disk.
+[{{ :courses:ast403:agn_unified.jpg?600 | Fig 1: A sketch of a unified model of an active galactic nucleus. The jets would be present in a radio-loud AGN. A typical observer’s point of view is indicated for AGNs of various types.}}]
 ===== Classification by Orientation =====
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 **Relativistic Beaming:** The fact that jets are frequently observed to be one-sided is explained by beaming; the jet approaching the observer is brightened by a factor of thousands, while the receding counter-jet is dimmed by the same factor.
+[{{ :courses:ast403:agn_hst.jpg?600 | Fig 2: Two views of NGC 4261. Left: a composite optical and radio image from the ground, showing the radio jets. Right: an optical image from the HST , showing the dusty torus around the nucleus. (Courtesy of NASA.)}}]