GRAVITATIONAL LENS MODELS BASED ON SUBMILLIMETER ARRAY IMAGING OF HERSCHEL-SELECTED STRONGLY LENSED SUB-MILLIMETER GALAXIES AT z > 1.5

By R. Bussmann, I. Pérez-Fournon, S. Amber, J. Calanog, M. Gurwell, H. Dannerbauer, F. Bernardis, H. Fu, A. Harris, M. Krips and 39 more. 2013

156 citations recorded by the source corpus.

Strong gravitational lenses are now being routinely discovered in wide-field 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 amplified by factors that are significantly below statistical model predictions given the 500 μm flux densities of our sample. We speculate that this may reflect a deficiency 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 ΣFIR = 6.0 × 1011 L☉ kpc−2). The strong lenses in this sample and others identified via (sub-)mm surveys will provide a wealth of information regarding the astrophysics of galaxy formation and evolution over a wide range in redshift.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/bf678b76920a973b971b621186e970d9ae3de473

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In Astronomy and Astrophysics

1. P. Hopkins
2. D. Narayanan
3. C. Casey
4. A. Cooray
5. P. J. Marshall
6. L. Hernquist
7. N. Murray
8. Risa Wechsler

In Instrumentation

1. P. J. Marshall
2. D. Narayanan
3. A. Cooray
4. C. Casey
5. C. Fassnacht
6. N. Murray
7. R. Blandford
8. Yao-Yuan Mao

Citations in the corpus

• DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81 (2016, methodology): “…discovered in sub-mm surveys like the South Pole Telescope (Vieira et al. 2013; Hezaveh et al. 2013b), Atacama Cosmology Telescope (Marsden et al. 2014) or Herschel (Negrello et al. 2010; Wardlow et al. 2013; Bussmann et al. 2013) could significantly improve constraints on dark matter substructure.”
• Dusty Star Forming Galaxies at High Redshift (2014, background): “With a surface density for S500 > 100 mJy lensed DSFGs at the level of 0.2 deg−2 (Negrello et al., 2010; Wardlow et al., 2013; Bussmann et al., 2013), andwith close to 1200 deg2 of Spire imaging data in theHerschel Science Archive, there should be close to 250 lensed DSFGs.”