The dynamics and high-energy emission of conductive gas clouds in supernova-driven galactic superwinds
| Autor: | A. D'Ercole, Charles G. Hoopes, Andrea Marcolini, David K. Strickland, Timothy M. Heckman |
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| Rok vydání: | 2005 |
| Předmět: |
Shock wave
Physics Astrophysics::High Energy Astrophysical Phenomena Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Astrophysics Bow shocks in astrophysics Thermal conduction Luminosity Supernova Thermal conductivity Space and Planetary Science Radiative transfer Absorption (electromagnetic radiation) Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 362:626-648 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | In this paper we present high-resolution hydrodynamical models of warm ionized clouds embedded in a superwind, and compare the OVI and soft X-ray properties to the existing observational data. These models include thermal conduction, which we show plays an important role in shaping both the dynamics and radiative properties of the resulting wind/cloud interaction. Heat conduction stabilizes the cloud by inhibiting the growth of K-H and R-T instabilities, and also generates a shock wave at the cloud's surface that compresses the cloud. This dynamical behaviour influences the observable properties. We find that while OVI emission and absorption always arises in cloud material at the periphery of the cloud, most of the soft X-ray arises in the region between the wind bow shock and the cloud surface, and probes either wind or cloud material depending on the strength of conduction and the relative abundances of the wind with respect to the cloud. In general only a small fraction ( 27 pages, 12 figures (4 in color), MNRAS accepted |
| Databáze: | OpenAIRE |
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