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The central cluster and X-ray emission from Sgr A*

Published online by Cambridge University Press:  01 August 2006

Robert F. Coker
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, USA email: [email protected]
Julian M. Pittard
Affiliation:
Department of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK email: [email protected]
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Abstract

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At the centre of the Milky Way is Sgr A*, a putative 3 million solar mass black hole with an observed luminosity that is orders of magnitude smaller than that expected from simple accretion theories. The number density of early-type stars is quite high near Sgr A*, so the ensemble of their stellar winds has a significant impact on the black hole's environment.

We present results of 3D hydrodynamic simulations of the accretion of stellar winds onto Sgr A*. Using the LANL/SAIC code, RAGE, we model the central arc-second of the Galaxy, including the central cluster stars (the S-stars) with orbits and wind parameters that match observations. A significant fraction of the winds from the S stars becomes gravitationally bound to the black hole and thus could provide enough hot gas to produce the X-ray emission seen by Chandra. We perform radiative transfer calculations on the 3D hydrodynamic data cubes and present the resulting synthetic X-ray spectrum.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

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