We present a study of the far-IR properties of a stellar mass selected sample of 1.5 < z < 3 galaxies with \log ( M _ { * } / { M _ { \sun } } ) > 9.5 drawn from the GOODS NICMOS Survey ( GNS ) , the deepest H -band Hubble Space Telescope survey of its type prior to the installation of WFC3 .
We use far-IR and sub-mm data from the PACS and SPIRE instruments on-board Herschel , taken from the PACS Evolutionary Probe ( PEP ) and Herschel Multi-Tiered Extragalactic Survey ( HerMES ) key projects respectively .
We find a total of 22 GNS galaxies , with median \log ( M _ { * } / { M _ { \sun } } ) = 10.8 and z = 2.0 , associated with 250 ~ { } \micron sources detected with SNR > 3 .
We derive mean total IR luminosity \log L _ { IR } ( L _ { \sun } ) = 12.36 \pm 0.05 and corresponding star formation rate SFR _ { IR + UV } = ( 280 \pm 40 ) M _ { \sun } yr ^ { -1 } for these objects , and find them to have mean dust temperature T _ { dust } \approx 35 K. We find that the SFR derived from the far-IR photometry combined with UV-based estimates of unobscured SFR for these galaxies is on average more than a factor of 2 higher than the SFR derived from extinction corrected UV emission alone , although we note that the IR-based estimate is subject to substantial Malmquist bias .
To mitigate the effect of this bias and extend our study to fainter fluxes , we perform a stacking analysis to measure the mean SFR in bins of stellar mass .
We obtain detections at the 2 - 4 \sigma level at SPIRE wavelengths for samples with \log ( M _ { * } / { M _ { \sun } } ) > 10 .
In contrast to the Herschel detected GNS galaxies , we find that estimates of SFR _ { IR + UV } for the stacked samples are comparable to those derived from extinction corrected UV emission , although the uncertainties are large .
We find evidence for an increasing fraction of dust obscured star formation with stellar mass , finding SFR _ { IR } / SFR _ { UV } \propto M _ { * } ^ { 0.7 \pm 0.2 } , which is likely a consequence of the mass–metallicity relation .