Nicole G. Czakon's research while affiliated with Academia Sinica and other places

... These maps were provided by the RELICS team and are made available for public use on MAST. 4 Because some RELICS clusters lack sufficient constraints to create a lens model, MNRAS 516, 2162-2170 (2022) nine of the RELICS clusters (A1300, A520, A665, PLCKG004-19, PLCKG138-10, PLCKG308-20, RXC1514-15, SPT0254-58, WHL0137-8) have no publicly available models, and thus any sources lensed by these clusters are discarded for the lack of reliable magnification measurements. For further information regarding these lens models, see Cerny et al. ( 2018 ), Acebron et al. ( 2018Acebron et al. ( , 2019Acebron et al. ( , 2020, Cibirka et al. ( 2018 ), Paterno-Mahler et al. ( 2018 ), Matthee et al. ( 2019 ), and Okabe et al. ( 2020 ). It is important to note that size measurements in the presence of lensing can be reco v ered robustly given an appropriate lens model, as shown by e.g. ...

... We also analyse how the critical HU redshift (i.e., redshift at which HU gets critical) varies in the presence of a second cluster scale lens component, leading us to discover a population of double-component lenses with large cross-sections for image formation near HUs. We also observe similar behaviour in a subset of cluster lenses in the reionization lensing cluster survey (RELICS; Coe et al. 2019). Finally, as pointed out in Meena & Bagla (2022), the relative time-delays between image pairs in HU image formation are an order of magnitude smaller than generic image formations in cluster lenses, we study the time delay distribution in observed HU image formations. ...

... In this work, we perform a multiwavelength study of the ICL fraction in two higher-redshift clusters observed by the Reionization Lensing Cluster Survey (RELICS; Coe et al. 2019): ACT-CLJ0102-49151 at z = 0.870 and CL J0152.7-1357 at z = 0.833 (ACT0102 and CL0152, hereafter, respectively). Both of them are well-known merging clusters (Menanteau et al. 2012;Acebron et al. 2019), so we will investigate whether the merging signature imprinted in the ICL fractions of z < 0.6 clusters is still present at z ∼ 0.8. This paper is organized as follows. ...

... Our lens model is built using Lenstool (Kneib 1993 ;Jullo et al. 2007 ). The model leverages the multiple-image constraints from Mahler et al. ( 2019 ) and Jauzac et al. ( 2019 ), as well as new multiple image systems and redshifts we obtained from the CANUCS-JWST data. The model includes cluster-size-and galaxysize haloes described as double Pseudo-Isothermal Elliptical profiles ). ...

... In the right-hand panel of Fig. 11 , we show the SPT-CLJ0615-5746 ( z = 0.972) galaxy cluster with a source at redshift z = 1.358 (e.g. Paterno-Mahler et al. 2018 ) leading to HU-like image formation. We mark the images with green ellipses and red curves are critical curves for a source at redshift 1.358. ...

... These maps were provided by the RELICS team and are made available for public use on MAST. 4 Because some RELICS clusters lack sufficient constraints to create a lens model, MNRAS 516, 2162-2170 (2022) nine of the RELICS clusters (A1300, A520, A665, PLCKG004-19, PLCKG138-10, PLCKG308-20, RXC1514-15, SPT0254-58, WHL0137-8) have no publicly available models, and thus any sources lensed by these clusters are discarded for the lack of reliable magnification measurements. For further information regarding these lens models, see Cerny et al. ( 2018 ), Acebron et al. ( 2018Acebron et al. ( , 2019Acebron et al. ( , 2020, Cibirka et al. ( 2018 ), Paterno-Mahler et al. ( 2018 ), Matthee et al. ( 2019 ), and Okabe et al. ( 2020 ). It is important to note that size measurements in the presence of lensing can be reco v ered robustly given an appropriate lens model, as shown by e.g. ...

... Here, we report an observation of a strongly lensed ∼L * star-forming galaxy: MACS0308-zD1 at z ∼ 6.2. We clearly detect a [C II] 158 μm emission line and measure the spectroscopic redshift of MACS0308-zD1 for the first time (Acebron et al. 2018;Salmon et al. 2020;. Making use of high-resolution, high-sensitivity ALMA observations, we also study the velocity structure and morphology of the [C II] emission. ...

... The HSC first-year shear catalogue (Mandelbaum et al. 2018a ) (hereafter HSC Y1 ) is based on observations taken from 2014 March to 2016 April using the Subaru Hyper Suprime-Cam in five broadbands, grizy . The HSC Y1 is defined with conserv ati ve cuts to select galaxies with secure shape measurements, S / N ≥ 10 and i < 24.5, resulting in a sample co v ering 136.9 de g 2 of the sk y in six disjoint patches: XMM , GAMA09H , WIDE12H , GAMA15H , VVDS , and HECTOMAP . ...

... In addition to JWST NIRCam data of the SMACS 0723 cluster, the MACS 0416 cluster, the NEP TDF, and the IDF, we also use public Hubble Space Telescope (HST) data of SMACS 0723 from the Reionization Lensing Cluster Survey (RELICS) program (GO 14096, PI: D. Coe). RELICS provides HST images and catalogs, of which we use the combined Advanced Camera for Surveys (ACS) and Wide Field Camera 3/Infrared (IR) catalog (Cerny et al. 2018;Salmon et al. 2020), with magnitudes in the F435W, F606W, F814W, F105W, F125W, F140W, and F160W filters. These observations have 5σ point source AB magnitude limits between 26.0 and 27.6 mag (Coe et al. 2019), and provide useful information at optical wavelengths for objects detected in the JWST data. ...

... [61][62][63][64][65] and galaxy weak lensing [e.g. [66][67][68][69][70] have been achieved recently, and are now advancing to become a major tool for precision cosmology. ...