Intensity Variations of the Soft X-ray Background: the Boundary Structure of the Local Hot Bubble at Low Galactic Latitudes

Astronomy and Astrophysics – Astronomy

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Scientific paper

42 ROSAT PSPC pointed observations in the first quadrant (l ~ 4(deg) - 26(deg) ) of the Galactic plane are mosaicked in order to study the spatial structure of the X-ray emitting gas in the Local Hot Bubble (LHB). X-ray intensity variations at various angular scales are searched in the 0.1 - 0.3 keV band. Degree-scale X-ray intensity variations are detected with an ~ 6(deg) scale variation being the most prominent. This intensity variation implies that there is a significant influence from the dense shell-like boundary structure of the LHB in the 0.1 -- 0.3 keV band diffuse X-ray background superposed upon the contribution due to the uniformly distributed 10(6) K gas along the line of sight.

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