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Fig. 4

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W49 continuum, HCO F = 1–1 and H13CO+ emission and absorption spectra. Left: 86.8 GHz continuum (grayscale; peak =2.5 Jy) and H13CO+ emission (contours of integrated brightness temperature in units of Kelvins km s-1). The 4′′ synthesized HPBW is shown inset at lower left. Right top: spectra of H13CO+ and HCO toward the continuum peak labelled position “A” at left. Right bottom: emission spectra at off-continuum positions “B” (blue in electronic media) and “C” (red). Spectra showing strong emission are H13CO+, those without are spectra of HCO.

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