Hilton, M; Conselice, CJ; Roseboom, IG; Burgarella, D; Buat, V; Berta, S; Béthermin, M; ... Zemcov, M; + view all Hilton, M; Conselice, CJ; Roseboom, IG; Burgarella, D; Buat, V; Berta, S; Béthermin, M; Bock, J; Chapman, SC; Clements, DL; Conley, A; Conversi, L; Cooray, A; Farrah, D; Ibar, E; Magdis, G; Magnelli, B; Marsden, G; Nordon, R; Oliver, SJ; Page, MJ; Popesso, P; Pozzi, F; Schulz, B; Scott, D; Smith, AJ; Symeonidis, M; Valtchanov, I; Viero, M; Wang, L; Zemcov, M; - view fewer (2012) Herschel observations of a z∼ 2 stellar mass selected galaxy sample drawn from the GOODS NICMOS Survey. Monthly Notices of the Royal Astronomical Society , 425 (1) 540 - 555. 10.1111/j.1365-2966.2012.21499.x.

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Abstract

We present a study of the far-infrared (IR) properties of a stellar mass selected sample of 1.5 < z < 3 galaxies with log (M*/M⊙) > 9.5 drawn from the Great Observatories Origins Deep Survey (GOODS) Near Infrared Camera and Multi-Object Spectrometer (NICMOS) Survey (GNS), the deepest H-band Hubble Space Telescope survey of its type prior to the installation of Wide Field Camera 3 (WFC3). We use far-IR and submm data from the Photoconductor Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging Receiver (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⊙) = 10.8 and z = 2.0, associated with 250 μm sources detected with signal-to-noise ratio (SNR) > 3. We derive mean total IR luminosity log LIR(L⊙) = 12.36 ± 0.05 and corresponding star formation rate (SFR)IR + UV = (280 ± 40) M⊙ yr−1 for these objects, and find them to have mean dust temperature Tdust ≈ 35 K. We find that the SFR derived from the far-IR photometry combined with ultraviolet (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 2–4σ level at SPIRE wavelengths for samples with log (M*/M⊙) > 10. In contrast to the Herschel detected GNS galaxies, we find that estimates of SFRIR + 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 , which is likely a consequence of the mass–metallicity relation.

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