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We exploit deep observations of the GOODS-N field taken with PACS, on boardof Herschel, as part of the PEP guaranteed time, to study the link between starformation and stellar mass in galaxies to z~2. Starting from a stellarmass-selected sample of ~4500 galaxies with mag[4.5mu]<23 (AB), we identify~350 objects with a PACS detection at 100 or 160mu and ~1500 with only Spitzer24 mu counterpart. Stellar masses and total IR luminosities (LIR) are estimatedby fitting the SEDs. Consistently with other Herschel results, we find that LIRbased only on 24 mu data is overestimated by a median factor ~1.8 at z~2,whereas it is underestimated (with our approach) up to a factor ~1.6 at0.5<z<1.0. We then exploit this calibration to correct LIR based on the MIPSfluxes. These results clearly show how Herschel is fundamental to constrainLIR, and hence the SFR, of high redshift galaxies. Using the galaxies detectedwith PACS (and/or MIPS), we investigate the existence and evolution of therelations between the star formation rate (SFR), the specific star formationrate (SSFR=SFR/mass) and the stellar mass. Moreover, in order to avoidselection effects, we also repeat this study through a stacking analysis on thePACS images to fully exploit the far-IR information also for the Herschel andSpitzer undetected subsamples. We find that the SSFR-mass relation steepenswith redshift, being almost flat at z<1.0 and reaching a slope ofalpha=-0.50^(+0.13)_(-0.16) at z~2, at odds with recent works based onradio-stacking analysis at the same redshift. The mean SSFR of galaxiesincreases with redshift, by a factor ~15 for massive M>10^(11) (M_sun) galaxiesfrom z=0 to z=2, and seems to flatten at z>1.5 in this mass range. Moreover,the most massive galaxies have the lowest SSFR at any z, implying that theyhave formed their stars earlier and more rapidly than their low masscounterparts.

The first Herschel view of the mass-SFR link in high-z galaxies