First Catalog of Strong Lens Candidates in the COSMOS Field

Abstract

We present the first catalog of 67 strong galaxy-galaxy lens candidates discovered in the 1.64 deg 2 Hubble Space Telescope COSMOS survey. Twenty of these systems display multiple images or strongly curved large arcs. Our initial search is performed by visual inspection of the data and is restricted, for practical considerations, to massive early-type lens galaxies with arcs found at radii smaller than $5 00 . Simple mass models are constructed for the best lens candidates, and our results are compared to the strong lensing catalogs of the SLACS survey and the CASTLES database. These new strong galaxy-galaxy lensing systems constitute a valuable sample to study the mass distribution of early-type galaxies and their associated dark matter halos. We further expect this sample to play an important role in the testing of software algorithms designed to automatically search for strong gravitational lenses. From our analysis a robust lower limit is derived for the expected occurrence of strong galaxy-galaxy systems in current and future space-based wide-field imaging surveys. We expect that such surveys should uncover a large number of strong lensing systems (more than 10 systems per square degree), which will allow for a detailed statistical analysis of galaxy properties and will likely lead to constraints on models of gravitational structure formation and cosmology.

The cosmological constant and the gravitational light bending

“…These equations were applied to five bona fide gravitational rings taken from the recent COSMOS survey [15] and the results are given in Table 3. As in the precedent case, corrections due to the cosmological constant on the mass values are of the order of 2%.…”

LinKS: discovering galaxy-scale strong lenses in the Kilo-Degree Survey using convolutional neural networks

“…The largest homogeneously-selected sample of confirmed strong lenses is the Sloan Lens ACS Survey (SLACS; Bolton et al 2006Bolton et al , 2008, which yielded more than a hundred spectroscopically confirmed strong lenses with complete redshift information and high-resolution imaging follow-up (with e.g., the Hubble Space Telescope and Keck Observatory Adaptive Optics). In total, all lens surveys combined have produced up to a thousand highly-likely 2 gravitational lens candidates (e.g., Browne et al 2003;Faure et al 2008;Treu et al 2011;Inada et al 2012;Brownstein et al 2012;More et al 2012;Stark et al 2013;Sonnenfeld et al 2013a;Gavazzi et al 2014;More et al 2016;Shu et al 2016Shu et al , 2017.…”

Survey of Gravitationally lensed Objects in HSC Imaging (SuGOHI) – V. Group-to-cluster scale lens search from the HSC–SSP Survey

“…Systems with references are previously known, whereas other objects with "..." are new. References: 1 2016), 9 Cabanac et al (2007), 10 Stark et al (2013), 11 Tanaka et al (2016), 12 Bolton et al (2008), 13 Faure et al (2008), 14 Hammer (1991), 15 Carrasco et al (2017), 16 Chan et al (2019), 17 Tyson et al (1990). acquired through three arms, the ultraviolet (UVB, λλ3,000 -5,500 Å), the visual (VIS, λλ5,000 -10,500 Å), and the near-infrared (NIR, λλ10,000 -25,000 Å).…”