Strong gravitational lenses are now being routinely discovered in wide-eld surveys at (sub- )millimeter wavelengths. We present Submillimeter Array (SMA) high-spatial resolution imaging and Gemini-South and Multiple Mirror Telescope optical spectroscopy of strong lens candidates discovered in the two widest extragalactic surveys conducted by the Herschel Space Observatory: the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) and the Herschel Multi-tiered Extragalactic Survey (HerMES). From a sample of 30 Herschel sources with S500 > 100 mJy, 21 are strongly lensed (i.e., multiply imaged), 4 are moderately lensed (i.e., singly imaged), and the remainder require additional data to determine their lensing status. We apply a visibility-plane lens modeling technique to the SMA data to recover information about the masses of the lenses as well as the intrinsic (i.e., unlensed) sizes (rhalf ) and far-infrared luminosities (LFIR) of the lensed submillimeter galaxies (SMGs). The sample of lenses comprises primarily isolated massive galaxies, but includes some groups and clusters as well. Several of the lenses are located at zlens > 0:7, a redshift regime that is inaccessible to lens searches based on Sloan Digital Sky Survey spectroscopy. The lensed SMGs are amplied by factors that are signicantly below statistical model predictions given the 500 m ux densities of our sample. We speculate that this may re ect a deciency in our understanding of the intrinsic sizes and luminosities of the brightest SMGs. The lensed SMGs span nearly one decade in LFIR (median LFIR = 7:9 1012 L) and two decades in FIR luminosity surface density (median FIR = 6:01011 L kpc2). The strong lenses in this sample and others identied via (sub-)mm surveys will provide a wealth of information regarding the astrophysics of galaxy formation and evolution over a wide range in redshift.
|Titolo:||Gravitational Lens Models Based on Submillimeter Array Imaging of Herschel-selected Strongly Lensed Sub-millimeter Galaxies at z>1.5|
|Autori:||Bussmann R S; Perez-Fournon I; Amber S; Calanog J; Gurwell M A; Dannerbauer H; De Bernardis F; Fu H; Harris A I; Krips M; Lapi A; Maiolino R; Omont A; Riechers D; Wardlow J; Baker A J; Birkinshaw M; Bock J; Bourne N; Clements D L; Cooray A; De Zotti G; Dunne L; Dye S; Eales S; Farrah D; Gavazzi R; Gonzalez Nuevo J; Hopwood R; Ibar E; Ivison R J; Laporte N; Maddox S; Martinez-Navajas P; Michalowski M; Negrello M; Oliver S J; Roseboom I G; Scott D; Serjeant S; Smith A J; Smith; M; Streblyanska A; Valiante E; van der Werf P; Verma A; Vieira J D; Wang L; Wilner D|
|Rivista:||THE ASTROPHYSICAL JOURNAL|
|Data di pubblicazione:||2013|
|Digital Object Identifier (DOI):||10.1088/0004-637X/779/1/25|
|Appare nelle tipologie:||1.1 Journal article|