HerMES: CANDIDATE GRAVITATIONALLY LENSED GALAXIES AND LENSING STATISTICS AT SUBMILLIMETER WAVELENGTHS
By J. Wardlow, A. Cooray, F. Bernardis, A. Amblard, V. Arumugam, H. Aussel, A. Baker, M. B'ethermin, R. Blundell, J. Bock and 76 more. 2012
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We present a list of 13 candidate gravitationally lensed submillimeter galaxies (SMGs) from 95 deg2 of the Herschel Multi-tiered Extragalactic Survey, a surface density of 0.14 ± 0.04 deg−2. The selected sources have 500 μm flux densities (S500) greater than 100 mJy. Gravitational lensing is confirmed by follow-up observations in 9 of the 13 systems (70%), and the lensing status of the four remaining sources is undetermined. We also present a supplementary sample of 29 (0.31 ± 0.06 deg−2) gravitationally lensed SMG candidates with S500 = 80–100 mJy, which are expected to contain a higher fraction of interlopers than the primary candidates. The number counts of the candidate lensed galaxies are consistent with a simple statistical model of the lensing rate, which uses a foreground matter distribution, the intrinsic SMG number counts, and an assumed SMG redshift distribution. The model predicts that 32%–74% of our S500 ⩾ 100 mJy candidates are strongly gravitationally lensed (μ ⩾ 2), with the brightest sources being the most robust; this is consistent with the observational data. Our statistical model also predicts that, on average, lensed galaxies with S500 = 100 mJy are magnified by factors of ∼9, with apparently brighter galaxies having progressively higher average magnification, due to the shape of the intrinsic number counts. 65% of the sources are expected to have intrinsic 500 μm flux densities less than 30 mJy. Thus, samples of strongly gravitationally lensed SMGs, such as those presented here, probe below the nominal Herschel detection limit at 500 μm. They are good targets for the detailed study of the physical conditions in distant dusty, star-forming galaxies, due to the lensing magnification, which can lead to spatial resolutions of ∼0.″01 in the source plane.
Subfields: Astronomy and Astrophysics, Instrumentation
View Paper: https://www.semanticscholar.org/paper/c1812c4a2062b61f52eec71c39cccfe9122c83da
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Citations in the corpus
- GRAVITATIONAL LENS MODELS BASED ON SUBMILLIMETER ARRAY IMAGING OF HERSCHEL-SELECTED STRONGLY LENSED SUB-MILLIMETER GALAXIES AT z > 1.5 (2013, methodology): “Instead of MIRIAD’s mossdi task, which was used in Wardlow et al. (2013) to image this object, here we have shifted all of the visibility datasets to have the same phase center and then used MIRIAD’s clean task.”
- VALIDATION OF THE EQUILIBRIUM MODEL FOR GALAXY EVOLUTION TO z ∼ 3 THROUGH MOLECULAR GAS AND DUST OBSERVATIONS OF LENSED STAR-FORMING GALAXIES (2013, background): “In particular, most of the literature on this concentrates on the special case of submm- or FIRselected galaxies such as the Eyelash (e.g. Hezaveh et al. 2012; Serjeant 2012; Fu et al. 2012; Wardlow et al. 2013).”
- 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.”
- DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81 (2016, background): “…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.”