Isocam deep surveys unveiling star formation in the mid-infrared
D. Elbaz, H. Aussel, C. J. Cesarsky, F. X. Desert, D. Fadda, A. Franceschini, J. L. Puget, J. L. Starck
Abstract
Before having exhausted the helium in its tank on April 8, 1998, the Infrared Space Observatory had time to perform several complementary surveys at various depths and areas within selected regions of the sky. We present the results of some of the surveys done with the mid-infrared camera, ISOCAM, on-board ISO, and more specifically those surveys which were performed using the broad-band filter LW3 (12-18 microns). We show that mid-infrared allows to discriminate starburst and post-starburst galaxies among galaxies which present similar optical-UV morphological and colour signatures. Furthermore, the strong evolution found in the surveys indicates that more star formation is hidden in the infrared at higher redshifts.
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