SPITZER IMAGING OF STRONGLY LENSED HERSCHEL-SELECTED DUSTY STAR-FORMING GALAXIES

被引:7
作者
Ma, Brian [1 ]
Cooray, Asantha [1 ,2 ]
Calanog, J. A. [1 ]
Nayyeri, H. [1 ]
Timmons, N. [1 ]
Casey, C. [1 ]
Baes, M. [3 ]
Chapman, S. [4 ]
Dannerbauer, H. [5 ]
da Cunha, E. [6 ]
De Zotti, G. [7 ,8 ]
Dunne, L. [9 ,10 ]
Farrah, D. [11 ]
Fu, Hai [12 ]
Gonzalez-Nuevo, J. [13 ]
Magdis, G. [14 ]
Michalowski, M. J. [9 ]
Oteo, I. [9 ,15 ]
Riechers, D. A. [16 ]
Scott, D. [17 ]
Smith, M. W. L. [18 ]
Wang, L. [19 ,20 ]
Wardlow, J. [21 ]
Vaccari, M. [22 ]
Viaene, S. [3 ]
Vieira, J. D. [23 ]
机构
[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[2] CALTECH, Pasadena, CA 91125 USA
[3] Univ Ghent, Sterrenkundig Observ, B-9000 Ghent, Belgium
[4] Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS B3H 4R2, Canada
[5] Univ Paris Diderot, CNRS, Irfu, Lab AIM Paris Saclay,CEA,DSM,CE Saclay, F-91191 Gif Sur Yvette, France
[6] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia
[7] Osserv Astron Padova, INAF, I-35122 Padua, Italy
[8] SISSA, I-34136 Trieste, Italy
[9] Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland
[10] Univ Canterbury, Dept Phys & Astron, Christchurch 8140, New Zealand
[11] Virginia Tech, Dept Phys, Blacksburg, VA 24061 USA
[12] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[13] Univ Oviedo, Dept Fis, E-33007 Oviedo, Spain
[14] Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England
[15] European So Observ, D-85748 Garching, Germany
[16] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA
[17] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[18] Cardiff Univ, Dept Phys & Astron, Cardiff CF24 3AA, S Glam, Wales
[19] Univ Durham, Inst Computat Cosmol, Dept Phys, Durham DH1, England
[20] SRON Netherlands Inst Space Res, NL-9747 AD Groningen, Netherlands
[21] Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-1168 Copenhagen, Denmark
[22] Univ Western Cape, Astrophys Grp, Dept Phys, Cape Town, South Africa
[23] Univ Illinois, Dept Phys & Astron, Urbana, IL 61801 USA
基金
美国国家科学基金会; 欧洲研究理事会; 新加坡国家研究基金会;
关键词
submillimeter:; galaxies; DEEP-FIELD-SOUTH; SUBMILLIMETER-SELECTED GALAXIES; HIGH-REDSHIFT; EXTRAGALACTIC SURVEY; LUMINOSITY FUNCTIONS; PHYSICAL-PROPERTIES; INTERSTELLAR-MEDIUM; INFRARED GALAXIES; FORMATION RATES; STELLAR MASSES;
D O I
10.1088/0004-637X/814/1/17
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
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页数:13
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