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Fig. 3

image

Gray scale images showing the separate maps of dust temperature, TD(eff), (left) and optical depth, τ850, (right) for the California Molecular Cloud. The large dark region of high dust temperature at l 160 is the famous California Nebula, an HII region ionized by a runaway O star not associated with the California Molecular Cloud. The smaller, more compact hot region at l 165.5 is NGC 1579 and it is excited by the only embedded cluster in the cloud. Neither region appears noticeable on the optical depth map, illustrating the low opacities of the dust within the two HII regions.

This figure is made of several images, please see below:

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