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Using extremely deep PACS 100- and 160um Herschel data from theGOODS-Herschel program, we identify 21 infrared bright galaxies previouslymissed in the deepest 24um surveys performed by MIPS. These MIPS dropouts arepredominantly found in two redshift bins, centred at z ~0.4 and ~1.3. TheirS_100/S_24 flux density ratios are similar to those of local LIRGs and ULIRGs,whose silicate absorption features at 18um (at z ~ 0.4) and 9.7um (at z ~ 1.3)are shifted into the 24um MIPS band at these redshifts. The high-z sub-sampleconsists of 11 infrared luminous sources, accounting for ~2% of the wholeGOODS-Herschel sample and putting strong upper limits on the fraction ofLIRGs/ULIRGs at 1.0<z<1.7 that are missed by the 24um surveys. We find that aS_100/S_24 > 43 colour cut selects galaxies with a redshift distributionsimilar to that of the MIPS dropouts and when combined with a second colourcut, S_16/S_8 > 4, isolates sources at 1.0 < z < 1.7. We show that thesesources have elevated specific star formation rates (sSFR) compared to mainsequence galaxies at these redshifts and are likely to be compact starburstswith moderate/strong 9.7um silicate absorption features in their mid-IRspectra. Herschel data reveal that their infrared luminosities extrapolatedfrom the 24um flux density are underestimated, on average, by a factor of ~3.These silicate break galaxies account for 16% (8%) of the ULIRG (LIRG)population in the GOODS fields, indicating a lower limit in their space densityof 2.0 \times 10^(-5) Mpc^(-3). Finally, we provide estimates of the fractionof z < 2 MIPS dropout sources as a function of the 24-, 100-, 160-, 250- and350um sensitivity limits, and conclude that previous predictions of apopulation of silicate break galaxies missed by the major 24um extragalacticsurveys have been overestimated.

GOODS-Herschel A population of 24micron dropout sources at z < 2