Two problems the star formation rate and the initial mass function in this final section well come up to the present state of the art and talk about what are probably the two largest unsolved problems in star formation today the star formation rate and the origin of the initial mass function. Is the planck function generally we look for emission at submillimeter wavelengths and for absorption at near infrared wavelengths in the sub mm typical opacities are 001 cm 2 g 1since essentially no interstellar cloud has a surface density 100 g cm 2 absorption of radiation from the back of the cloud by gas in front of it is completely negligible. Star formation is one of the least understood processes in cosmic evolution it is difficult to formulate a general theory for star formation in part because of the wide range of physical processes involved. A general theory of turbulence regulated star formation from spirals to ulirgs mark r krumholz physics department university of california berkeley berkeley ca 94720. Slow star formation in dense gas evidence and implications mark r krumholz 1 department of astrophysical sciences princeton university princeton nj and jonathan c tan department of astronomy
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