Characterization of Herschel-selected strong lens candidates through HST and sub-mm/mm observations
Journal article, 2024
We have carried out Hubble Space Telescope (HST) snapshot observations at 1.1 μm of 281 candidate strongly lensed galaxies identified in the wide-area extragalactic surveys conducted with the Herschel Space Observatory. Our candidates comprise systems with flux densities at 500 μm, S500 ≥ 80 mJy. We model and subtract the surface brightness distribution for 130 systems, where we identify a candidate for the foreground lens candidate. After combining visual inspection, archival high-resolution observations, and lens subtraction, we divide the systems into different classes according to their lensing likelihood. We confirm 65 systems to be lensed. Of these, 30 are new discoveries. We successfully perform lens modelling and source reconstruction on 23 systems, where the foreground lenses are isolated galaxies and the background sources are detected in the HST images. All the systems are successfully modelled as a singular isothermal ellipsoid. The Einstein radii of the lenses and the magnifications of the background sources are consistent with previous studies. However, the background source circularized radii (between 0.34 and 1.30 kpc) are ∼3 times smaller than the ones measured in the sub-millimetre/millimetre for a similarly selected and partially overlapping sample. We compare our lenses with those in the Sloan Lens Advanced Camera for Surveys (ACS) Survey confirming that our lens-independent selection is more effective at picking up fainter and diffuse galaxies and group lenses. This sample represents the first step towards characterizing the near-infrared properties and stellar masses of the gravitationally lensed dusty star-forming galaxies.
galaxies: high-redshift
galaxies: photometry
gravitational lensing: strong
Author
E. Borsato
University of Padua
L. Marchetti
University of Cape Town
Istituto di Radioastronomia
University of the Western Cape
M. Negrello
Cardiff University
E. M. Corsini
Istituto nazionale di astrofisica (INAF)
University of Padua
D. Wake
The University of North Carolina System
A. Amvrosiadis
Durham University
A. J. Baker
Rutgers University
University of the Western Cape
Tom Bakx
National Astronomical Observatory of Japan
Nagoya University
A. Beelen
Institut d'Astrophysique Spatiale
S. Berta
Institut de Radioastronomie Millimétrique (IRAM)
A. Beyer
University of Cologne
D. L. Clements
Imperial College London
A. Cooray
University of California
P. Cox
Institut d 'Astrophysique de Paris
H. Dannerbauer
University of La Laguna
Instituto de Astrofísica de Canarias
G. De Zotti
Istituto nazionale di astrofisica (INAF)
S. Dye
University of Nottingham
S. Eales
Cardiff University
A. F.M. Enia
Istituto nazionale di astrofisica (INAF)
University of Bologna
D. Farrah
University of Hawaii
J. González-Nuevo
University of Oviedo
ICTEA
David H. Hughes
National Institute of Astrophysics, Optics and Electronics
D. Ismail
Centre National d'Etudes Spatiales (CNES)
S. Jin
Cosmic Dawn Center (DAWN)
Technical University of Denmark (DTU)
A. Lapi
Scuola Internazionale Superiore di Studi Avanzati
M. Lehnert
Université de Lyon
R. Neri
Institut de Radioastronomie Millimétrique (IRAM)
I. Perez-Fournon
Instituto de Astrofísica de Canarias
University of La Laguna
D. A. Riechers
University of Cologne
G. Rodighiero
Istituto nazionale di astrofisica (INAF)
University of Padua
D. Scott
University of British Columbia (UBC)
S. Serjeant
Open University
F. Stanley
Institut de Radioastronomie Millimétrique (IRAM)
S. Urquhart
Open University
P. van der Werf
Leiden University
M. Vaccari
University of the Western Cape
Istituto di Radioastronomia
L. Wang
Netherlands Institute for Space Research (SRON)
University of Groningen
Chentao Yang
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
A. J. Young
Rutgers University
Monthly Notices of the Royal Astronomical Society
00358711 (ISSN) 13652966 (eISSN)
Vol. 528 4 6222-6279Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
DOI
10.1093/mnras/stad3381