Bibcode
Negrello, M.; Amber, S.; Amvrosiadis, A.; Cai, Z.-Y.; Lapi, A.; Gonzalez-Nuevo, J.; De Zotti, G.; Furlanetto, C.; Maddox, S. J.; Allen, M.; Bakx, T.; Bussmann, R. S.; Cooray, A.; Covone, G.; Danese, L.; Dannerbauer, H.; Fu, H.; Greenslade, J.; Gurwell, M.; Hopwood, R.; Koopmans, L. V. E.; Napolitano, N.; Nayyeri, H.; Omont, A.; Petrillo, C. E.; Riechers, D. A.; Serjeant, S.; Tortora, C.; Valiante, E.; Verdoes Kleijn, G.; Vernardos, G.; Wardlow, J. L.; Baes, M.; Baker, A. J.; Bourne, N.; Clements, D.; Crawford, S. M.; Dye, S.; Dunne, L.; Eales, S.; Ivison, R. J.; Marchetti, L.; Michałowski, M. J.; Smith, M. W. L.; Vaccari, M.; van der Werf, P.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 465, Issue 3, p.3558-3580
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3
2017
Citations
120
Refereed citations
107
Description
We present a sample of 80 candidate strongly lensed galaxies with flux
density above 100 mJy at 500 μm extracted from the Herschel
Astrophysical Terahertz Large Area Survey, over an area of 600
deg2. Available imaging and spectroscopic data allow us to
confirm the strong lensing in 20 cases and to reject it in one case. For
other eight objects, the lensing scenario is strongly supported by the
presence of two sources along the same line of sight with distinct
photometric redshifts. The remaining objects await more follow-up
observations to confirm their nature. The lenses and the background
sources have median redshifts zL = 0.6 and zS =
2.5, respectively, and are observed out to zL = 1.2 and
zS = 4.2. We measure the number counts of candidate lensed
galaxies at 500 μm and compare them with theoretical predictions,
finding a good agreement for a maximum magnification of the background
sources in the range 10-20. These values are consistent with the
magnification factors derived from the lens modelling of individual
systems. The catalogue presented here provides sub-mm bright targets for
follow-up observations aimed at exploiting gravitational lensing, to
study with unprecedented details the morphological and dynamical
properties of dusty star-forming regions in z ≳ 1.5 galaxies.
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Helmut
Dannerbauer