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

Hilton, M. and Bock, J. and Cooray, A. and Schulz, B. and Viero, M. and Zemcov, M. (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). pp. 540-555. ISSN 0035-8711.

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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 T_dust ≈ 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 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) ∝ M^(0.7±0.2)_*, which is likely a consequence of the mass–metallicity relation.

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Cooray, A.0000-0002-3892-0190
Additional Information:© 2012 The Authors. Monthly Notices of the Royal Astronomical Society © 2012 RAS. Accepted 2012 June 11. Received 2012 June 8; in original form 2012 January 26. Article first published online: 27 Jul. 2012. We thank the referee for many helpful comments which have improved this paper. We thank Amanda Bauer for providing the UV-based SFR measurements of GNS galaxies and useful discussions. MH and CJC acknowledge financial support from the Leverhulme Trust and STFC. Support for the GNS was also provided by NASA/STScI grant HST-GO11082. SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including Univ. Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, Univ. Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, Univ. Sussex (UK) and Caltech, JPL, NHSC, Univ. Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy);MCINN (Spain); SNSB (Sweden); STFC, UKSA (UK) and NASA (USA). PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KU Leuven, CSL, IMEC (Belgium); CEA, LAM (France); MPIA (Germany); INAFIFSI/OAA/OAP/OAT, LENS, SISSA (Italy) and IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI/INAF (Italy) and CICYT/MCYT (Spain).
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Leverhulme TrustUNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:galaxies: evolution; galaxies: high-redshift; galaxies: starburst; galaxies: star formation; infrared: galaxies
Record Number:CaltechAUTHORS:20121008-143240324
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Official Citation:Hilton, M., Conselice, C. J., Roseboom, I. G., Burgarella, D., Buat, V., Berta, S., Béthermin, M., Bock, J., Chapman, S. C., Clements, D. L., Conley, A., Conversi, L., Cooray, A., Farrah, D., Ibar, E., Magdis, G., Magnelli, B., Marsden, G., Nordon, R., Oliver, S. J., Page, M. J., Popesso, P., Pozzi, F., Schulz, B., Scott, D., Smith, A. J., Symeonidis, M., Valtchanov, I., Viero, M., Wang, L. and Zemcov, M. (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: 540–555. doi: 10.1111/j.1365-2966.2012.21499.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34760
Deposited By: Jason Perez
Deposited On:10 Oct 2012 21:02
Last Modified:07 Dec 2016 20:30

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