Meaning of hidden SFR

All star formation is ‘hidden’: never expect dust-free burst

‘hidden’ : ‘visible’ ratio depends on lifetime of high-mass stars and dust burnoff time

Jimenez et al. models (astro-ph/9910279) predict 6:1 for Salpeter IMF

Similar boost factor for SFR inferred by Pettini et al. from Balmer lines, but foreground screen is not the right model

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