HerMES: Spectral Energy Distributions of Submillimeter Galaxies at z >4

Abstract

We present a study of the infrared properties for a sample of seven spectroscopically confirmed submillimeter galaxies 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 (SED) and a composite model to fit the SEDs. The model includes a stellar emission component at ${\lambda }_{\mathrm{rest}}<$ 3.5$\mu$m; a hot dust component peaking at ${\lambda }_{rest}\sim$ 5$\mu$m; and cold dust component which becomes significant for ${\lambda }_{\mathrm{rest}}>$ 50$\mu$m. Six objects in the sample are detected at 250 and 350$\mu$m. The dust temperatures for the sources in this sample are in the range of 40$-$80 K, and their $L_{\mathrm{FIR}}$ $\sim$ 10${}^{13}$ L${}_{\odot }$ qualifies them as Hyper$-$Luminous Infrared Galaxies (HyperLIRGs). 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$\mu$m detections corresponding to a rest-frame 4.5$\mu$m luminosity of Log${}_{10}$(L${}_{4.5}$ / L${}_{\odot }$) = 11 $\sim$ 11.5. Their L${}_{4.5}$/$L_{\mathrm{FIR}}$ ratios are very similar to those of starburst dominated submillimeter galaxies at $z\sim$ 2. The $L_{\mathrm{CO}}-L_{\mathrm{FIR}}$ relation for this sample is consistent with that determined for local ULIRGs and SMGs at $z\sim$ 2. We conclude that submillimeter galaxies at $z>$ 4 are hotter and more luminous in the FIR, but otherwise very similar to those at $z\sim$ 2. None of these sources show any sign of the strong QSO phase being triggered.

49 pages, 15 figures. Submitted to ApJ

References in corpus (22)

• A Dust-Obscured Massive Maximum-Starburst Galaxy at a Redshift of 6.34
• Mid-Infrared Spectral Diagnosis of Submillimeter Galaxies
• SHARC-2 350 Micron Observations of Distant Submillimeter Selected Galaxies
• A Significant Population of Very Luminous Dust-Obscured Galaxies at Redshift z ~ 2
• A massive proto-cluster of galaxies at a redshift of z {\approx} 5.3
• Evidence for a Population of High-Redshift Submillimeter Galaxies from Interferometric Imaging
• A Massive Molecular Gas Reservoir in the z=5.3 Submillimeter Galaxy AzTEC-3
• Spitzer Mid-Infrared Spectroscopy of Infrared Luminous Galaxies at z~2 I: the Spectra
• Testing the Evolutionary Link Between Submillimetre Galaxies and Quasars: CO Observations of QSOs at z~2
• Extended Mid-Infrared Aromatic Feature Emission in M 82
• The nature of star formation in distant ultraluminous infrared galaxies selected in a remarkably narrow redshift range
• Spectroscopic Confirmation Of An Extreme Starburst At Redshift 4.547
• A submillimetre galaxy at z=4.76 in the LABOCA survey of the Extended Chandra Deep Field South
• Molecular Gas in a Submillimeter Galaxy at z=4.5: Evidence for a Major Merger at 1 Billion Years after the Big Bang
• Interferometric 890 micron Images of High Redshift Submillimeter Galaxies
• GOODS 850-5 -- A z>4 Galaxy Discovered in the Submillimeter?
• Far-Infrared Properties of Spitzer-selected Luminous Starbursts
• Ultradeep Near-Infrared Observations of GOODS 850-5
• Strong PAH Emission from z~2 ULIRGs
• IRS Spectroscopy and Multi-wavelength Study of Luminous Star-forming Galaxies at z~1.9
• The Local Galaxy 8 micron Luminosity Function
• An Evolutionary Model For Submillimeter Galaxies

Cited by in corpus (29)

• An ALMA survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Physical properties derived from ultraviolet-to-radio modelling
• ALMA Imaging of Gas and Dust in a Galaxy Protocluster at Redshift 5.3: [CII] Emission in "Typical" Galaxies and Dusty Starbursts ~1 Billion Years after the Big Bang
• Infrared color selection of massive galaxies at z > 3
• Turbulent Gas in Lensed Planck-selected Starbursts at redshifts 1-3.5
• An ALMA survey of submillimetre galaxies in the COSMOS field: Physical properties derived from energy balance spectral energy distribution modelling
• NuSTAR observations of WISE J1036+0449, a Galaxy at z$\sim 1$ obscured by hot dust
• Deceptively cold dust in the massive starburst galaxy GN20 at $z\sim 4$
• Physical properties of z>4 submillimeter galaxies in the COSMOS field
• CO emission in distant galaxies on and above the main sequence
• Infrared spectral energy distribution decomposition of WISE-selected, hyperluminous hot dust-obscured galaxies
• Early Science with the Large Millimeter Telescope: CO and [C II] Emission in the z=4.3 AzTEC J095942.9+022938 (COSMOS AzTEC-1)
• The Contribution of Host Galaxies to the Infrared Energy Output of $z\gtrsim 5.0$ QUASARS
• HERUS: The Far-IR/Submm Spectral Energy Distributions of Local ULIRGs & Photometric Atlas
• Evidence for the Thermal Sunyaev-Zel'dovich Effect Associated with Quasar Feedback
• A new look at the infrared properties of z $\sim$ 5 galaxies
• The Far Infrared Emission of the First Massive Galaxies
• On the redshift distribution and physical properties of ACT-selected DSFGs
• Quiescent galaxies at $z\gtrsim 2.5$: observations vs. models
• The hyperluminous Compton-thick $z\sim 2$ quasar nucleus of the hot DOG W1835+4355 observed by NuSTAR
• The ALPINE-ALMA [CII] Survey: On the nature of an extremely obscured serendipitous galaxy
• The SCUBA-2 850 $\mu m$ follow-up of WISE-selected, luminous dust-obscured quasars
• (Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies IV. Physical properties derived from spectral energy distributions
• Identification of z~>2 Herschel 500 micron sources using color-deconfusion
• Molecular gas properties of Planck-selected protocluster candidates at z~1.3-3
• Downsizing of Star Formation Measured from the Clustered Infrared Background Correlated with Quasars
• HerMES: Disentangling active galactic nuclei and star formation in the radio source population
• The spectral energy distribution of galaxies at z > 2.5: Implications from the Herschel/SPIRE color-color diagram
• Euclid: Identifying the reddest high-redshift galaxies in the Euclid Deep Fields with gradient-boosted trees
• A unique distant submillimeter galaxy with an X-ray-obscured radio-luminous active galactic nucleus