On the X-ray emission from massive star clusters and their evolving superbubbles II. Detailed analytics and observational effects

Details On the X-ray emission from massive star clusters and their evolving superbubbles II. Detailed analytics and observational effects On the X-ray emission from massive star clusters and their evolving superbubbles II. Detailed analytics and observational effects

2009-03-10

arxiv.org/abs/0903.1678v1

Mon.Not.Roy.Astron.Soc.394:1284A,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

30 pages, 15 figures. Accepted by MNRAS

Scientific paper

10.1111/j.1365-2966.2009.14423.x

In this work, we present a comprehensive X-ray picture of the interaction between a super star cluster and the ISM. In order to do that, we compare and combine the X-ray emission from the superwind driven by the cluster with the emission from the wind-blown bubble. Detailed analytical models for the hydrodynamics and X-ray luminosity of fast polytropic superwinds are presented. The superwind X-ray luminosity models are an extension of the results obtained in Paper I of this series. Here, the superwind polytropic character allows to parameterize a wide variety of effects, for instance, radiative cooling. Additionally, X-ray properties that are valid for all bubble models taking thermal evaporation into account are derived. The final X-ray picture is obtained by calculating analytically the expected surface brightness and weighted temperature of each component. All of our X-ray models have an explicit dependence on metallicity and admit general emissivities as functions of the hydrodynamical variables. We consider a realistic X-ray emissivity that separates the contributions from hydrogen and metals. The paper ends with a comparison of the models with observational data.

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