a deep x-ray view of the hot halo in the edge-on spiral ... - IOPscience
Dec 7, 2012 · closed-box models of Galactic chemical evolution predict a larger number of metal-poor stars in the solar neighborhood than we observe (the ... ground surface brightness from the ROSAT All-Sky Survey. (RASS) data. ... halo surface brightness does indeed drop below the background on the scale of the ...
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