X-rays from wind-blown bubbles: an XMM-Newton detection of NGC 2359

Svetozar A. Zhekov

Space Research and Technology Institute, Sofia, Bulgaria

We present an analysis of the XMM-Newton observation of the
wind-blown bubble NGC 2359. This is the first detection of this object
in X-rays. The X-ray emission of NGC 2359 is soft and originates from
a thermal plasma with a typical temperature of kT ~ 0.2 keV. A direct
comparison between the one-dimensional hydrodynamic model of
wind-blown bubbles and the X-ray spectrum of NGC 2359 suggests a
reduced mass-loss rate of the central star in order to provide the
correct value of the observed flux. The central star of the nebula,
WR 7, is an X-ray source. Its emission is similar to that of other
presumably single Wolf-Rayet stars detected in X-rays. The WR 7
spectrum is well represented by the emission from a two-temperature
plasma with a cool component of kT ~ 0.6 keV and a hot component of kT
~ 2.7 keV.

Reference: Monthly Notices of the Royal Astronomical Society
Status: Manuscript has been accepted

Weblink: http://arxiv.org/abs/1406.2463


Email: szhekov@space.bas.bg