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HerMES: Spectral energy distributions of submillimeter galaxies at z > 4*

  • Author(s): Huang, JS
  • Rigopoulou, D
  • Magdis, G
  • Rowan-Robinson, M
  • Dai, Y
  • Bock, JJ
  • Burgarella, D
  • Chapman, S
  • Clements, DL
  • Cooray, A
  • Farrah, D
  • Glenn, J
  • Oliver, S
  • Smith, AJ
  • Wang, L
  • Page, M
  • Riechers, D
  • Roseboom, I
  • Symeonidis, M
  • Fazio, GG
  • Yun, M
  • Webb, TMA
  • Efstathiou, A
  • et al.
Abstract

We present a study of the infrared properties for a sample of seven spectroscopically confirmed submillimeter galaxies (SMGs) at z > 4.0. By combining ground-based near-infrared, Spitzer IRAC and MIPS, Herschel SPIRE, and ground-based submillimeter/millimeter photometry, we construct their spectral energy distributions (SEDs) and a composite model to fit the SEDs. The model includes a stellar emission component at λ < 3.5 μm, a hot dust component peaking at λ ∼ 5 μm, and cold dust component which becomes significant for λ > 50 μm. Six objects in the sample are detected at 250 and 350 μm. The dust temperatures for the sources in this sample are in the range of 40-80 K, and their L ∼ 10 L qualifies them as hyper-luminous infrared galaxies. The mean FIR-radio index for this sample is around 〈q〉 = 2.2 indicating no radio excess in their radio emission. Most sources in the sample have 24 μm detections corresponding to a rest-frame 4.5 μm luminosity of Log (L /L ) = 11 ∼ 11.5. Their L /L ratios are very similar to those of starburst-dominated SMGs at z ∼ 2. The L -L relation for this sample is consistent with that determined for local ULIRGs and SMGs at z ∼ 2. We conclude that SMGs at z > 4 are hotter and more luminous in the FIR but otherwise very similar to those at z ∼ 2. None of these sources show any sign of the strong QSO phase being triggered. © 2014. The American Astronomical Society. All rights reserved. rest rest rest FIR ⊙ 10 4.5 ⊙ 4.5 FIR CO FIR 13

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