The Following text was taken from the ESA Science site: URL: http://isowww.estec.esa.nl/science/
This is an ISOCAM false colour image of the ISO 15 micron map of the Hubble Deep Field area. The white spots are the detected infrared sources, which can be associated with optical galaxies in the Hubble maps. Of the seven best cases, for two we are probably just seeing infrared radiation from red giant stars in the galaxies. For the other five, the infrared radiation is interpreted as emission from a dust shrouded 'starburst', a tremendous burst of star formation.
The rates at which stars are being formed are estimated to be from 10-1000 solar masses per year, compared with the current star formation rate in our Galaxy of 1 solar mass per year.
More information on this project, headed by Prof Michael Rowan-Robinson of Imperial College, UK, in consortium with several European institutes, can be found here
INFRARED PROCESSING AND ANALYSIS CENTER