THE SLOAN BRIGHT ARCS SURVEY: DISCOVERY OF SEVEN NEW STRONGLY LENSED GALAXIES FROM
                    <i>z</i>
                    = 0.66-2.94

Kubo, Jeffrey M.; Allam, S.; Drabek, Emily; Lin, Huan; Tucker, D. L.; Buckley-Geer, E.; Diehl, H. T.; Soares-Santos, M.; Hao, Jiangang; Wiesner, Matthew; West, A. A.; Kubik, D.; Annis, James; Frieman, Joshua A.

doi:10.1088/2041-8205/724/2/l137

Cited by 37 publications

(33 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 1.64 deg 2 Hubble Space Telescope COSMOS survey field yielded 67 galaxy-galaxy lens candidates (Faure et al 2008). The SDSS data yielded 19 confirmed systems to the Sloan Bright Arcs Survey (Allam et al 2007;Diehl et al 2009;Kubo et al 2009Kubo et al , 2010Lin et al 2009), more than 30 confirmed and 50 additional candidate lenses to the CASSOWARY survey (Belokurov et al 2009;Pettini et al 2010;Stark et al 2013), and 68 new galaxy clusters with giant arcs (Wen et al 2011). The CFHTLS-Strong Lensing Legacy Survey (More et al 2012) sample includes 54 systems with promising lenses, including 12 giant arcs, found in 150 deg 2 using the ARCFINDER method.…”

Section: Introductionmentioning

confidence: 99%

The DES Bright Arcs Survey: Hundreds of Candidate Strongly Lensed Galaxy Systems from the Dark Energy Survey Science Verification and Year 1 Observations

Diehl¹,

Buckley-Geer²,

Lindgren³

et al. 2017

ApJS

View full text Add to dashboard Cite

We report the results of searches for strong gravitational lens systems in the Dark Energy Survey (DES) Science Verification and Year 1 observations. The Science Verification data span approximately 250 sq. deg. with a median i-band limiting magnitude for extended objects (10σ) of 23.0. The Year 1 data span approximately 2000 sq. deg. and have an i-band limiting magnitude for extended objects (10σ) of 22.9. As these data sets are both wide and deep, they are particularly useful for identifying strong gravitational lens candidates. Potential strong gravitational lens candidate systems were initially identified based on a color and magnitude selection in the DES The Astrophysical Journal Supplement Series, 232:15 (28pp), 2017 September https://doi.org/10.3847/1538-4365/aa8667 © 2017. The American Astronomical Society. All rights reserved.1 object catalogs or because the system is at the location of a previously identified galaxy cluster. Cutout images of potential candidates were then visually scanned using an object viewer and numerically ranked according to whether or not we judged them to be likely strong gravitational lens systems. Having scanned nearly 400,000 cutouts, we present 374 candidate strong lens systems, of which 348 are identified for the first time. We provide the R.A. and decl., the magnitudes and photometric properties of the lens and source objects, and the distance (radius) of the source(s) from the lens center for each system.

show abstract

Section: Introductionmentioning

confidence: 99%

The DES Bright Arcs Survey: Hundreds of Candidate Strongly Lensed Galaxy Systems from the Dark Energy Survey Science Verification and Year 1 Observations

Diehl¹,

Buckley-Geer²,

Lindgren³

et al. 2017

ApJS

View full text Add to dashboard Cite

show abstract

“…These applications have triggered arc searches in surveys covering large areas (Gladders et al 2003;Estrada et al 2007;Cabanac et al 2007;Kneib et al 2010;More et al 2011;Belokurov et al 2009;Kubo et al 2010), in large spectrocospic surveys (Bolton et al 2008;Brownstein et al 2012), and in surveys targeting known clusters (Luppino et al 1999;Zaritsky & Gonzalez 2003;Smith et al 2005;Hennawi et al 2008;Makler et al 2010;Richard et al 2010b;Kausch et al 2010;Furlanetto et al 2012). Upcoming wide field imaging surveys, such as the Dark Energy Survey (Abbott et al 2005;Annis et al 2005) and the Large Synoptic Survey Telescope (Stubbs et al 2004;Ivezic et al 2008), will lead to the identification of larger samples of arcs in thousands of galaxies and galaxy clusters, well suited for arc statistics.…”

Section: Introductionmentioning

confidence: 99%

Domain of validity for pseudo-elliptical NFW lens models

Dúmet-Montoya

Caminha

Makler

2012

A&A

View full text Add to dashboard Cite

Context. Owing to their computational simplicity, models with elliptical potentials (pseudo-elliptical) are often used in gravitational lensing applications, in particular for mass modeling using arcs and for arc statistics. However, these models generally lead to negative mass distributions in some regions and to dumbbell-shaped surface density contours for high ellipticities. Aims. We revisit the physical limitations of the pseudo-elliptical Navarro-Frenk-White (PNFW) model, focusing on the behavior of the mass distribution close to the tangential critical curve, where tangential arcs are expected to be formed. We investigate the shape of the mass distribution on this region and the presence of negative convergence. We obtain a mapping from the PNFW to the NFW model with elliptical mass distribution (ENFW). We compare the arc cross section for both models, aiming to determine a domain of validity for the PNFW model in terms of its mass distribution and for the cross section. Methods. We defined a figure of merit to i) measure the deviation of the iso-convergence contours of the PNFW model to an elliptical shape, ii) assigned an ellipticity ε Σ to these contours, iii) defined a corresponding iso-convergence contour for the ENFW model. We computed the arc cross section using the "infinitesimal circular source approximation". Results. We extend previous work by investigating the shape of the mass distribution of the PNFW model for a broad range of the potential ellipticity parameter ε and characteristic convergence κ ϕ s . We show that the maximum value of ε to avoid dumbbellshaped mass distributions is explicitly dependent on κ ϕ s , with higher ellipticities (ε 0.5, i.e., ε Σ 0.65) allowed for small κ ϕ s . We determine a relation between the ellipticity of the mass distribution ε Σ and ε valid for any ellipticity. We also derive the relation of characteristic convergences, obtaining a complete mapping from PNFW to ENFW models, and provide fitting formulae for connecting the parameters of both models. Using this mapping, the cross sections for both models are compared, setting additional constraints on the parameter space of the PNFW model such that it reproduces the ENFW results. We also find that the negative convergence regions occur far from the arc formation region and should therefore not be a problem for studies with gravitational arcs. Conclusions. We conclude that the PNFW model is well-suited to model an elliptical mass distribution on a larger ε-κ ϕ s parameter space than previously expected. However, if we require the PNFW model to reproduce the arc cross section of the ENFW well, the ellipticity is more restricted, particularly for low κ ϕ s . The determination of a domain of validity for the PNFW model and the mapping to ENFW models could have implications for the use of PNFW models for the inverse modeling of lenses and for fast arc simulations, for example.

show abstract

“…The simplest approach is to search large-area imaging surveys for objects which visually appear to be strongly lensed. Efforts in Hubble imaging fields [25] and the Sloan Digital Sky Survey [26,27,28] have uncovered well over 100 such galaxies, which tend to be much brighter (in both intrinsic and apparent luminosity) compared to cluster lensing samples. Additionally, such imaging surveys are prone to false positives particularly in seeing-limited surveys, and hence improved imaging or spectroscopy is needed for confirmation [29].…”

Section: Galaxy-scale and Group-scale Lensesmentioning

confidence: 99%

A magnified view of galaxy formation

Jones¹

2016

Proceedings of Frank N. Bash Symposium 2015 — PoS(BASH2015)

View full text Add to dashboard Cite

Distant galaxies are difficult to study because of their small angular size and faint apparent brightness. I discuss observations of gravitationally lensed galaxies which are highly magnified, providing superior sensitivity and spatial resolution. These data reveal a wealth of information about galaxy physical properties and evolution during their most active period of formation at redshifts z = 1-3. Spatially resolved spectroscopic data indicate that most galaxies at this epoch are forming stars in gravitationally unstable, turbulent disks. Gas-phase metallicity is a particularly valuable diagnostic of gas content and inflow/outflow which regulate the growth of galaxies, with observations indicating relatively high gas fractions and outflow rates. Looking forward, dedicated surveys of lensed galaxies from large telescopes on the ground and in space are dramatically increasing our knowledge of galaxy physical properties at early times and the processes by which they evolve.

show abstract

THE SLOAN BRIGHT ARCS SURVEY: DISCOVERY OF SEVEN NEW STRONGLY LENSED GALAXIES FROM z = 0.66-2.94

Cited by 37 publications

References 17 publications

The DES Bright Arcs Survey: Hundreds of Candidate Strongly Lensed Galaxy Systems from the Dark Energy Survey Science Verification and Year 1 Observations

The DES Bright Arcs Survey: Hundreds of Candidate Strongly Lensed Galaxy Systems from the Dark Energy Survey Science Verification and Year 1 Observations

Domain of validity for pseudo-elliptical NFW lens models

A magnified view of galaxy formation

Contact Info

Product

Resources

About