Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-06-25
Astrophys.J.596:159-169,2003
Astronomy and Astrophysics
Astrophysics
10 pages (emulateapj5) with 4 figures; accepted by The Astrophysical Journal
Scientific paper
10.1086/377596
The failure of the XMM-Newton and Chandra X-ray telescopes to detect cooling gas in elliptical galaxies and clusters of galaxies has led many to adopt the position that the gas is not cooling at all and that heating by an active nucleus in the central E or cD galaxy is sufficient to offset radiative cooling. In this paper we explore an idealized limiting example of this point of view in which hot, buoyant bubbles formed near the center return the inflowing, radiatively cooling gas to distant regions in the flow. We show that idealized steady state, centrally heated non-cooling flows can indeed be constructed. In addition, the emission-weighted temperature profiles in these circulating flows resemble those of normal cooling flows. However, these solutions are valid only (1) for a range of bubble parameters for which there is no independent justification, (2) for a limited spatial region in the cooling flow and (3) for a limited period of time after which cooling seems inevitable. Our exploration of non-cooling flows is set in the context of galaxy/group flows.
Brighenti Fabrizio
Buote David A.
Lewis Aaron D.
Mathews William G.
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