Star formation in the NICMOS HDF

This contribution discusses the rate of star formation in the galaxies obse rved in the NICMOS Hubble Deep Field. A combination of the earlier fluxes f rom the WFPC II HDF measurements and the NICMOS near infrared measurement p roduces a superb data base for the application of photometric redshift tech niques. By capitalizing on the extended wavelength coverage of this data we also determine the most likely extinction values for each galaxy. With the se measurements we then calculate the star formation rate for each galaxy a nd determine the distribution of this rate with redshift. Our basic conclus ion is that the star formation rate in the NICMOS HDF has been relatively c onstant for redshifts between 1 and 6.