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The Soft X-ray Background Spectrum from DXS

Published online by Cambridge University Press:  12 April 2016

W.T. Sanders ,
R.J. Edgar ,
D.A. Liedahl  and
J.P. Morgenthaler
W.T. Sanders
Affiliation:
Department of Physics, University of Wisconsin–Madison, 1150 University Avenue, Madison, WI 53706, USA
R.J. Edgar
Affiliation:
Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
D.A. Liedahl
Affiliation:
V-Division, Lawrence Livermore National Lab., P. O. Box 808, L-41, Livermore, CA 94550, USA
J.P. Morgenthaler
Affiliation:
Department of Physics, University of Wisconsin–Madison, 1150 University Avenue, Madison, WI 53706, USA

Abstract

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The Diffuse X-ray Spectrometer (DXS) obtained spectra of the low energy X-ray (44 – 83 Å) diffuse background near the galactic plane from galactic longitudes 150° ≲ l ≲ 300° with ≲ 3 Å spectral resolution and ~ 15° angular resolution. Thus, DXS measured X-ray spectra that arise almost entirely from within the Local Bubble. The DXS spectra show emission lines and emission-line blends, indicating that the source of the X-ray emission is thermal – hot plasma in the Local Bubble. The measured spectra are not consistent with those predicted by standard coronal models, either with solar abundances or depleted abundances, over the temperature range 105 – 107 K. The measured spectra are also inconsistent with the predictions of various non-equilibrium models. A nearly acceptable fit to DXS spectra can be achieved using a hybrid model that combines the Raymond & Smith ionization balance calculation with recently calculated (by DAL) ionic emission lines.

Type
Part III Observations and Modeling of the Local Bubble and the SXRB
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 83 - 90
Copyright
Copyright © Springer-Verlag 1998

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