Journal Article

<i>Herschel</i> observations of a <i>z</i> ∼ 2 stellar mass selected galaxy sample drawn from the GOODS NICMOS Survey

M. Hilton, C. J. Conselice, I. G. Roseboom, D. Burgarella, V. Buat, S. Berta, M. Béthermin, J. Bock, S. C. Chapman, D. L. Clements, A. Conley, L. Conversi, A. Cooray, D. Farrah, E. Ibar, G. Magdis, B. Magnelli, G. Marsden, R. Nordon, S. J. Oliver, M. J. Page, P. Popesso, F. Pozzi, B. Schulz, Douglas Scott, A. J. Smith, M. Symeonidis, I. Valtchanov, M. Viero, L. Wang and M. Zemcov

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 425, issue 1, pages 540-555
Published in print September 2012 | ISSN: 0035-8711
Published online September 2012 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2012.21499.x
Herschel observations of a z ∼ 2 stellar mass selected galaxy sample drawn from the GOODS NICMOS Survey

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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.

Keywords: galaxies: evolution; galaxies: high-redshift; galaxies: starburst; galaxies: star formation; infrared: galaxies

Journal Article.  11094 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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