Journal article
SPITZER IMAGING OF STRONGLY LENSED HERSCHEL-SELECTED DUSTY STAR-FORMING GALAXIES
The Astrophysical journal, Vol.814(1), pp.1-13
11/12/2015
DOI: 10.1088/0004-637X/814/1/17
Abstract
ABSTRACT We present the rest-frame optical spectral energy distribution (SED) and stellar masses of six Herschel-selected gravitationally lensed dusty, star-forming galaxies (DSFGs) at 1 < z < 3. These galaxies were first identified with Herschel/SPIRE imaging data from the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) and the Herschel Multi-tiered Extragalactic Survey (HerMES). The targets were observed with Spitzer/IRAC at 3.6 and 4.5 m. Due to the spatial resolution of the IRAC observations at the level of 2″, the lensing features of a background DSFG in the near-infrared are blended with the flux from the foreground lensing galaxy in the IRAC imaging data. We make use of higher resolution Hubble/WFC3 or Keck/NIRC2 Adaptive Optics imaging data to fit light profiles of the foreground lensing galaxy (or galaxies) as a way to model the foreground components, in order to successfully disentangle the foreground lens and background source flux densities in the IRAC images. The flux density measurements at 3.6 and 4.5 m, once combined with Hubble/WFC3 and Keck/NIRC2 data, provide important constraints on the rest-frame optical SED of the Herschel-selected lensed DSFGs. We model the combined UV- to millimeter-wavelength SEDs to establish the stellar mass, dust mass, star formation rate, visual extinction, and other parameters for each of these Herschel-selected DSFGs. These systems have inferred stellar masses in the range 8 × 1010-4 × 1011 M and star formation rates of around 100 M yr−1. This puts these lensed submillimeter systems well above the SFR-M* relation observed for normal star-forming galaxies at similar redshifts. The high values of SFR inferred for these systems are consistent with a major merger-driven scenario for star formation.
Details
- Title: Subtitle
- SPITZER IMAGING OF STRONGLY LENSED HERSCHEL-SELECTED DUSTY STAR-FORMING GALAXIES
- Creators
- Brian Ma - University of California, IrvineAsantha Cooray - University of California, IrvineJ. A Calanog - University of California, IrvineH Nayyeri - University of California, IrvineN Timmons - University of California, IrvineC Casey - University of California, IrvineM Baes - Ghent UniversityS Chapman - Dalhousie UniversityH Dannerbauer - Université Paris DiderotE da Cunha - Swinburne University of TechnologyG De Zotti - Scuola Internazionale Superiore di Studi AvanzatiL Dunne - University of EdinburghD Farrah - Virginia TechHai Fu - University of IowaJ Gonzalez-Nuevo - Universidad de Oviedo C/ Calvo Sotelo Departamento de Fisica, s/n, E-33007 Oviedo, SpainG Magdis - University of OxfordM. J Michałowski - University of EdinburghI Oteo - University of EdinburghD. A Riechers - Cornell UniversityD Scott - University of British ColumbiaM. W. L Smith - Cardiff UniversityL Wang - Space Research Organisation NetherlandsJ Wardlow - University of CopenhagenM Vaccari - University of the Western CapeS Viaene - Ghent UniversityJ. D Vieira - University of Illinois at Urbana–Champaign
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.814(1), pp.1-13
- DOI
- 10.1088/0004-637X/814/1/17
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- Institute of Physics (IOP)
- Number of pages
- 13
- Language
- English
- Date published
- 11/12/2015
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984200027002771
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