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| Paper: |
The broad-line region as supernova remnants |
| Volume: |
31, Relationships Between Active Galactic Nuclei and Starburst Galaxies |
| Page: |
147 |
| Authors: |
Tenorio-Tagle, Guillermo; Terlevich, Roberto; Franco, Jose; Melnick, Jorge |
| Abstract: |
Supernova remnants evolving in a dense medium (n about 10**7 percc) become strongly radiative while still expanding at velocities of several thousands of km/s. Radiative cooling becomes important well before the thermalization of the ejecta is completed and makes the remnant miss the Sedov adiabatic track. As a result, the shocked matter undergoes a rapid condensation behind both the leading and the reverse shocks. Two concentric, high-density, fast moving thin shells are then formed. Both cool dense shells, as well as the freely expanding ejecta, and a section of the still dynamically unperturbed interstellar gas, are irradiated and ionized by the photon field produced by the radiative shocks. The emitted spectrum has emission-line ratios similar to those observed in the broad line region of low-luminosity active galactic nuclei. Our model combines analytic and numerical hydrodynamic simulations, together with static photoionization calculations to reproduce the observed properties of these broad-line regions. |
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