Abstract
We report broadband imaging and spectral observations in the energy range 0.8-12 keV with ASCA toward the H II region complex W3. We find a hard X-ray source, with substantial emission at energies greater than 4 keV, coincident with the W3 core region. The SIS images show that the emission in the W3 core is extended in the east-west direction, similar to the distribution of the compact H II regions. Fitting an optically thin, thermal plasma model to the X-ray spectra from the W3 core region, we find a temperature of 7 × 107 K, an absorbing hydrogen column of 2.1 × 1022 cm-2, and a luminosity of ≈ 1033 ergs s-1 in the 2-10 keV band. Weak line emission from the He-like ion of Fe XXV at 6.7 keV is also detected. If the X-ray emission is typical of Galactic compact H II regions, then they cannot be the primary source of the Fe XXV emission from the Galactic disk.
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