10_1088_0004-637X_784_1_52.pdf (2.93 MB)
HerMES: spectral energy distributions of submillimeter galaxies at z > 4.
journal contribution
posted on 2023-06-08, 20:57 authored by J-S Huang, D Rigopoulou, G Magdis, M Rowan-Robinson, Y Dai, J J Bock, D Burgarella, S Chapman, D L Clements, A Cooray, D Farrah, J Glenn, Seb OliverSeb Oliver, A J Smith, L Wang, M Page, D Riechers, I Roseboom, M Symeonidis, G G Fazio, M Yun, T M A Webb, A EfstathiouWe present a study of the infrared properties for a sample of seven spectroscopically confirmed submillimetre galaxies (SMGs) at z > 4.0. By combining ground-based near-infrared, Spitzer IRAC and MIPS, Herschel SPIRE, and ground-based submillimetre / 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 ? rest <3.5µm, a hot dust component peaking at ? rest ~ 5µm, and cold dust component which becomes significant for ? rest > 50µm. Six objects in the sample are detected at 250 and 350µm. The dust temperatures for the sources in this sample are in the range of 40–80 K, and their L FIR ~ 10 13 Lo 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 24µmdetections corresponding to a rest-frame 4.5µm luminosity of Log 10 (L 4.5 /L ? )=11 ~ 11.5. Their L 4.5 /L FIR ratios are very similar to those of starburst-dominated SMGs at z ~ 2. The L CO - L FIR 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.
History
Publication status
- Published
File Version
- Published version
Journal
The Astrophysical JournalISSN
0004-637XPublisher
American Astronomical SocietyExternal DOI
Issue
52Volume
784Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2015-06-01First Open Access (FOA) Date
2015-06-01First Compliant Deposit (FCD) Date
2015-05-29Usage metrics
Categories
No categories selectedLicence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC