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Observations of the x-ray diffuse background suggest that a significant fraction of the volume of the Galaxy contains low-density million-degree gas. Large-scale angular structures seen in x-ray all-sky surveys imply the existence of at least three nearb y bubbles of hot gas, Sco-Cen, Orion-Eridanus, and Mono-Gem, in addition to x-ray emitting gas located in the local cavity. The near-isotropy of...
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...