Spectrum (histogram) of [ 13 CII] emission in the star-forming region N159W superposed on an image from Hubble Space Telescope of the Large Magellanic Cloud. The blue curve is the scaled emission that would be expected if the [ 12 CII] emission from the same region were optically thin. The observed intensity of [ 13 CII] is stronger than the scaled emission, indicating that [ 12 CII] is optically thick.
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SOFIA Reveals the Complex Nature of a 'Simple' Star Formation Tracer
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