Reflections of Active Galactic Nucleus Outbursts in the Gaseous Atmosphere of M87
| Autor: | E. M. Churazov, R. P. Kraft, William R. Forman, Alexey Vikhlinin, Frazer N. Owen, Sebastian Heinz, C. Jones, Jean A. Eilek, Maxim Markevitch, Paul Nulsen |
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| Rok vydání: | 2005 |
| Předmět: |
Physics
Jet (fluid) Shock (fluid dynamics) Astrophysics::High Energy Astrophysical Phenomena Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Plasma Cooling flow Galaxy Space and Planetary Science ROSAT Radiative transfer Astrophysics::Solar and Stellar Astrophysics Surface brightness Astrophysics::Galaxy Astrophysics |
| Zdroj: | The Astrophysical Journal. 635:894-906 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | We combined deep Chandra, ROSAT HRI, and XMM-Newton observations of M87 to study the impact of AGN outbursts on its gaseous atmosphere. Many X-ray features appear to be a direct result of repetitive AGN outbursts. In particular, the X-ray cavities around the jet and counter jet are likely due to the expansion of radio plasma, while rings of enhanced emission at 14 and 17 kpc are probably shock fronts associated with outbursts that began 1-2\times10^7 years ago. The effects of these shocks are also seen in brightenings within the prominent X-ray arms. On larger scales, ~50 kpc from the nucleus, depressions in the surface brightness may be remnants of earlier outbursts. As suggested for the Perseus cluster (Fabian et al.), our analysis of the energetics of the M87 outbursts argues that shocks may be the most significant channel for AGN energy input into the cooling flow atmospheres of galaxies, groups, and clusters. For M87, the mean power driving the shock outburst, 2.4\times 10^{43} ergs/sec, is three times greater than the radiative losses from the entire ``cooling flow''. Thus, even in the absence of other energy inputs, outbursts every 3\times10^7 years are sufficient to quench the flow. |
| Databáze: | OpenAIRE |
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