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Spitzer imaging of strongly lensed Herschel-selected dusty star-forming galaxies

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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 mu 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 mu 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 x 10(10)-4 x 10(11) M-circle dot and star formation rates of around 100 M-circle dot 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.
Keywords
FORMATION RATES, STELLAR MASSES, INFRARED GALAXIES, INTERSTELLAR-MEDIUM, PHYSICAL-PROPERTIES, LUMINOSITY FUNCTIONS, EXTRAGALACTIC SURVEY, HIGH-REDSHIFT, DEEP-FIELD-SOUTH, SUBMILLIMETER-SELECTED GALAXIES, submillimeter: galaxies

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Chicago
Ma, Brian, Asantha Cooray, JA Calanog, H Nayyeri, N Timmons, C Casey, Maarten Baes, et al. 2015. “Spitzer Imaging of Strongly Lensed Herschel-selected Dusty Star-forming Galaxies.” Astrophysical Journal 814 (1).
APA
Ma, Brian, Cooray, A., Calanog, J., Nayyeri, H., Timmons, N., Casey, C., Baes, M., et al. (2015). Spitzer imaging of strongly lensed Herschel-selected dusty star-forming galaxies. ASTROPHYSICAL JOURNAL, 814(1).
Vancouver
1.
Ma B, Cooray A, Calanog J, Nayyeri H, Timmons N, Casey C, et al. Spitzer imaging of strongly lensed Herschel-selected dusty star-forming galaxies. ASTROPHYSICAL JOURNAL. 2015;814(1).
MLA
Ma, Brian, Asantha Cooray, JA Calanog, et al. “Spitzer Imaging of Strongly Lensed Herschel-selected Dusty Star-forming Galaxies.” ASTROPHYSICAL JOURNAL 814.1 (2015): n. pag. Print.
@article{7059478,
  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 {\textlangle} z {\textlangle} 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 mu m. Due to the spatial resolution of the IRAC observations at the level of 2{\textacutedbl} 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 mu 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 x 10(10)-4 x 10(11) M-circle dot and star formation rates of around 100 M-circle dot 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.},
  articleno    = {17},
  author       = {Ma, Brian and Cooray, Asantha and Calanog, JA and Nayyeri, H and Timmons, N and Casey, C and Baes, Maarten and Chapman, S and Dannerbauer, H and da Cunha, E and De Zotti, G and Dunne, L and Farrah, D and Fu, H and Gonzalez-Nuevo, J and Magdis, G and Micha\unmatched{0142}owski, MJ and Oteo, I and Riechers, DA and Scott, D and Smith, MWL and Wang, L and Wardlow, J and Vaccari, M and Viaene, S{\'e}bastien and Vieira, JD},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keyword      = {FORMATION RATES,STELLAR MASSES,INFRARED GALAXIES,INTERSTELLAR-MEDIUM,PHYSICAL-PROPERTIES,LUMINOSITY FUNCTIONS,EXTRAGALACTIC SURVEY,HIGH-REDSHIFT,DEEP-FIELD-SOUTH,SUBMILLIMETER-SELECTED GALAXIES,submillimeter: galaxies},
  language     = {eng},
  number       = {1},
  pages        = {13},
  title        = {Spitzer imaging of strongly lensed Herschel-selected dusty star-forming galaxies},
  url          = {http://dx.doi.org/10.1088/0004-637X/814/1/17},
  volume       = {814},
  year         = {2015},
}

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