scholarly journals Weak-lensing clusters from HSC survey first-year data: Mitigating the dilution effect of foreground and cluster-member galaxies

2020 ◽  
Vol 72 (5) ◽  
Author(s):  
Takashi Hamana ◽  
Masato Shirasaki ◽  
Yen-Ting Lin
Keyword(s):  
Dilution Effect ◽  
Weak Lensing ◽  
First Year ◽  
Cluster Member ◽  
The Public ◽  
Photometric Redshift ◽  
Source Sample ◽  
Strategic Program ◽  
Dilution Effects ◽  
Cross Match

Abstract We present a weak-lensing cluster search using Hyper Suprime-Cam Subaru Strategic Program (HSC survey) first-year data. We pay special attention to the dilution effect of cluster-member and foreground galaxies on weak-lensing signals from clusters of galaxies; we adopt the globally normalized weak-lensing estimator which is least affected by cluster-member galaxies, and we select source galaxies by using photometric redshift information to mitigate the effect of foreground galaxies. We produce six samples of source galaxies with different low-z galaxy cuts, construct weak-lensing mass maps for each source sample, and search for high peaks in the mass maps that cover an effective survey area of ∼120 deg2. We combine six catalogs of high peaks into a sample of cluster candidates which contains 124 high peaks with signal-to-noise ratios greater than five. We cross-match the peak sample with the public optical cluster catalog constructed from the same HSC survey data to identify cluster counterparts of the peaks. We find that 107 out of 124 peaks have matched clusters within 5′ of peak positions. Among them, we define a subsample of 64 secure clusters that we use to examine dilution effects on our weak-lensing cluster search. We find that source samples with low-z galaxy cuts mitigate the dilution effect on weak-lensing signals of high-z clusters ($z \gtrsim 0.3$), and thus combining multiple peak catalogs from different source samples improves the efficiency of weak-lensing cluster searches.

scholarly journals μ⋆ masses: weak-lensing calibration of the Dark Energy Survey Year 1 redMaPPer clusters using stellar masses

2020 ◽  
Vol 498 (4) ◽  
pp. 5450-5467
Author(s):  
M E S Pereira ◽  
A Palmese ◽  
T N Varga ◽  
T McClintock ◽  
M Soares-Santos ◽  
...  
Keyword(s):  
Dark Energy ◽  
Weak Lensing ◽  
Cluster Member ◽  
Scaling Relation ◽  
Photometric Redshift ◽  
Dark Energy Survey ◽  
Source Sample ◽  
Stellar Masses ◽  
First Time ◽  
Energy Survey

ABSTRACT We present the weak-lensing mass calibration of the stellar-mass-based μ⋆ mass proxy for redMaPPer galaxy clusters in the Dark Energy Survey Year 1. For the first time, we are able to perform a calibration of μ⋆ at high redshifts, z > 0.33. In a blinded analysis, we use ∼6000 clusters split into 12 subsets spanning the ranges 0.1 ≤ z < 0.65 and μ⋆ up to ${\sim} 5.5 \times 10^{13} \, \mathrm{M}_{\odot }$, and infer the average masses of these subsets through modelling of their stacked weak-lensing signal. In our model, we account for the following sources of systematic uncertainty: shear measurement and photometric redshift errors, miscentring, cluster-member contamination of the source sample, deviations from the Navarro–Frenk–White halo profile, halo triaxiality, and projection effects. We use the inferred masses to estimate the joint mass–μ⋆–z scaling relation given by $\langle M_{200c} | \mu _{\star },z \rangle = M_0 (\mu _{\star }/5.16\times 10^{12} \, \mathrm{M_{\odot }})^{F_{\mu _{\star }}} ((1+z)/1.35)^{G_z}$. We find $M_0= (1.14 \pm 0.07) \times 10^{14} \, \mathrm{M_{\odot }}$ with $F_{\mu _{\star }}= 0.76 \pm 0.06$ and Gz = −1.14 ± 0.37. We discuss the use of μ⋆ as a complementary mass proxy to the well-studied richness λ for: (i) exploring the regimes of low z, λ < 20 and high λ, z ∼ 1; and (ii) testing systematics such as projection effects for applications in cluster cosmology.

scholarly journals Dark Energy Survey Year 1 results: validation of weak lensing cluster member contamination estimates from P(z) decomposition

2019 ◽  
Vol 489 (2) ◽  
pp. 2511-2524 ◽  
Author(s):  
T N Varga ◽  
J DeRose ◽  
D Gruen ◽  
T McClintock ◽  
S Seitz ◽  
...  
Keyword(s):  
Dark Energy ◽  
Decomposition Method ◽  
Weak Lensing ◽  
Cluster Member ◽  
Photometric Redshift ◽  
Cluster Mass ◽  
Dark Energy Survey ◽  
Mass Calibration ◽  
The Masses ◽  
Energy Survey

ABSTRACT Weak lensing source galaxy catalogues used in estimating the masses of galaxy clusters can be heavily contaminated by cluster members, prohibiting accurate mass calibration. In this study, we test the performance of an estimator for the extent of cluster member contamination based on decomposing the photometric redshift P(z) of source galaxies into contaminating and background components. We perform a full scale mock analysis on a simulated sky survey approximately mirroring the observational properties of the Dark Energy Survey Year One observations (DES Y1), and find excellent agreement between the true number profile of contaminating cluster member galaxies in the simulation and the estimated one. We further apply the method to estimate the cluster member contamination for the DES Y1 redMaPPer cluster mass calibration analysis, and compare the results to an alternative approach based on the angular correlation of weak lensing source galaxies. We find indications that the correlation based estimates are biased by the selection of the weak lensing sources in the cluster vicinity, which does not strongly impact the P(z) decomposition method. Collectively, these benchmarks demonstrate the strength of the P(z) decomposition method in alleviating membership contamination and enabling highly accurate cluster weak lensing studies without broad exclusion of source galaxies, thereby improving the total constraining power of cluster mass calibration via weak lensing.

scholarly journals COVID-19 in Southeast Asia: Implications for workers and unions

2021 ◽  
pp. 002218562110000
Author(s):  
Michele Ford ◽  
Kristy Ward
Keyword(s):  
Public Health ◽  
Southeast Asia ◽  
Labour Market ◽  
Industrial Relations ◽  
First Year ◽  
Labour Relations ◽  
The Public ◽  
Market Effects ◽  
Export Orientation ◽  
Health Measures

The labour market effects in Southeast Asia of the COVID-19 pandemic have attracted considerable analysis from both scholars and practitioners. However, much less attention has been paid to the pandemic’s impact on legal protections for workers’ and unions’ rights, or to what might account for divergent outcomes in this respect in economies that share many characteristics, including a strong export orientation in labour-intensive industries and weak industrial relations institutions. Having described the public health measures taken to control the spread of COVID-19 in Indonesia, Cambodia and Vietnam, this article analyses governments’ employment-related responses and their impact on workers and unions in the first year of the pandemic. Based on this analysis, we conclude that the disruption caused to these countries’ economies, and societies, served to reproduce existing patterns of state–labour relations rather than overturning them.

scholarly journals Schnëssen. Surveying language dynamics in Luxembourgish with a mobile research app

2021 ◽  
Vol 7 (s1) ◽  
Author(s):  
Nathalie Entringer ◽  
Peter Gilles ◽  
Sara Martin ◽  
Christoph Purschke
Keyword(s):  
Data Analysis ◽  
Data Collection ◽  
Participatory Research ◽  
Picture Naming ◽  
Mobile App ◽  
First Year ◽  
The Public ◽  
Audio Recordings ◽  
Research Platform ◽  
Interactive Map

Abstract The mobile app Schnëssen establishes a digital and participatory research platform to collect data on present-day spoken Luxembourgish through crowdsourcing and to present the results of data analysis to the general public. Users can participate in different kinds of audio recording tasks (translation, picture naming, reading, question) as well as in sociolinguistic surveys. All audio recordings are accessible to the public via an interactive map, which allows the participants to explore variation in Luxembourgish themselves. In the first year of data collection, roughly 210.000 recordings have be collected covering numerous variation phenomena on all linguistic levels. Additionally, over 2800 sociolinguistic questionnaires have been filled out. Compiling such amounts of data, the Schnëssen app represents the largest research corpus of spoken Luxembourgish.

The acceptance of spelling variants as symbols of Croatian spelling changes (1994–2013)

2021 ◽  
Vol 24 (1) ◽  
pp. 110-148
Author(s):  
Tomislav Stojanov
Keyword(s):  
Questionnaire Survey ◽  
Native Speakers ◽  
First Year ◽  
Educational Setting ◽  
The Public ◽  
Study Programme ◽  
Spelling Variant ◽  
The Media ◽  
Technical Study ◽  
The Impact

Abstract This paper discusses the impact of several spelling changes in Croatian on the level of the literacy of native speakers. Since 1986, there have been five official recommendations for usage that pertain to five different orthographic manuals. This research focuses on three spelling points with considerable identity-related repercussions among the public and the media, which are sometimes named the spelling symbols of Croatian. A questionnaire-survey comprised of 36 tests was completed among 1063 students on a technical study programme each year for eight consecutive academic years. Eight generations of first-year undergraduates, who do not study language in an educational setting, have accepted the new spellings, contingent on a frequency principle. The more frequent a spelling variant occurs, the less the chance that the new spelling variant is accepted, and vice versa. Given the lack of established and enduring spelling norms, combined with ideological oppositions between the old and new spelling forms, students have been guided mainly by their capacity to write the most common form.

scholarly journals Two- and three-dimensional wide-field weak lensing mass maps from the Hyper Suprime-Cam Subaru Strategic Program S16A data

2017 ◽  
Vol 70 (SP1) ◽  
Author(s):  
Masamune Oguri ◽  
Satoshi Miyazaki ◽  
Chiaki Hikage ◽  
Rachel Mandelbaum ◽  
Yousuke Utsumi ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Weak Lensing ◽  
Wide Field ◽  
Strategic Program

scholarly journals Caso de buenas prácticas en la formación en TICs y fomento de la competencia digital en la sociedad, y, especialmente, en los colectivos en riesgo de exclusión digital.

EDMETIC ◽  
2017 ◽  
Vol 6 (2) ◽  
pp. 47
Author(s):  
Nuria Hernández León ◽  
Mario Miguel Hernández
Keyword(s):  
Analysis Data ◽  
First Year ◽  
Digital Competence ◽  
Good Practices ◽  
The Public ◽  
Castilla Y Leon ◽  
Regional Project ◽  
Digital Exclusion ◽  
Buenas Prácticas ◽  
Competencia Digital

En este artículo se realiza un análisis de un caso de buenas prácticas destinado a la formación en TICS para fomentar la adquisión de competencia digital en la sociedad, haciendo especial énfasis en los colectivos que se encuentran en riesgo de exclusión digital, realizado a través de un proyecto regional en Castilla y Léon (España), dependiente de la Administración Pública. Se toma como ejemplo el caso de un centro en la localidad de Salamanca (España) debido a la profesionalidad de los trabajadores, sus buenas prácticas, sus resultados y por ser el modelo a seguir del proyecto, tomando como datos de análisis el primer año de apertura del centro.________________In this article an analysis of a case of good practices for training in TICS is carried out to promote the acquisition of digital competence in society, with special emphasis on groups that are at risk of digital exclusion, carried out through a Regional project in Castilla y Léon (Spain), dependent on the Public Administration. The case of a center in the town of Salamanca (Spain) is taken as an example because of the professionalism of the workers, their good practices, their results and for being the model to follow the project, taking as analysis data the first year of the center. 

scholarly journals Reception of Natalie's Ramonda, Armistice Day Symbol in Serbia

2020 ◽  
Vol 14 (4) ◽  
Author(s):  
Senka Kovač
Keyword(s):  
Cultural Memory ◽  
Representative Sample ◽  
Public Discourse ◽  
First Year ◽  
World War ◽  
World War One ◽  
First Year Students ◽  
The Public ◽  
Ongoing Process ◽  
The Past

Nataliе’s Ramonda, a symbol of Armistice Day – November 11 in Serbia, is a new memorial symbol constructed and promoted by politicians in 2012. The Armistice Day was celebrated then as a national holiday in Serbia. The reception of this symbol has been explored over a five-year period, both in a public discourse and on a representative sample of first year students at the Faculty of Philosophy in Belgrade. In public discourse, as well as among students of the Faculty of Philosophy, Natalie’s Ramonda is perceived as an emblem, a badge, and most often as a symbol. It was seen as an emblem on the lapel of public and media figures, inaccessible to broad commercial promotion and sales. In public discourse and among students at the Faculty of Philosophy, Natalie’s Ramonda was perceived in several answers as a medal, and is also recognized as a flower that symbolizes the suffering of the Serbian people in World War One; symbol of the nation’s rebirth – the flower phoenix, as a mark of peace and freedom. As a newly constructed symbol of the Armistice Day in Serbia, for the past seven years, Natalie’s Ramonda has been a mediator in the public culture of remembrance and in the ongoing process, by becoming a part of cultural memory.

scholarly journals Towards sustainable public engagement (outreach)

2016 ◽  
pp. 41-46
Author(s):  
Timothy G Harrison ◽  
Dudley E Shallcross
Keyword(s):  
Public Engagement ◽  
Science Communication ◽  
Senior Management ◽  
Small Scale ◽  
First Year ◽  
Financial Cost ◽  
The Public ◽  
Full Support ◽  
Public Engagement In Science ◽  
Science Departments

There are myriad benefits to science departments that have a public engagement in science portfolio in addition to any recruitment of new undergraduates. These benefits are discussed in this paper and include: improving congruence between A level and first year undergraduate courses, training in science communication and the breaking down of barriers between the public and universities. All activity requires investment of personnel and incurs a financial cost. Small scale activities may be able to absorb this cost, but ultimately as the portfolio grows this will become an increasing drain on resources. Bristol ChemLabS Outreach has, from the very start, set out to be fully sustainable financially and in terms of personnel. A very important component is the full support of the senior management team. In this paper we discuss how we have achieved this.

scholarly journals Jacobus Capitein: Champion for Slavery and Resisting Mimic?

2021 ◽  
Vol 34 (2) ◽  
pp. 1-18
Author(s):  
Hendrik L. Bosman
Keyword(s):  
The Netherlands ◽  
First Year ◽  
Hybrid Identity ◽  
University Of Leiden ◽  
The Public ◽  
Reformed Church ◽  
The Bible ◽  
Ten Commandments ◽  
Articles Of Faith ◽  
The University

Jacobus Eliza Johannes Capitein (1717-1747) was a man of many firsts-the first black student of theology at the University of Leiden in the Netherlands, the first black minister ordained in the Dutch Reformed Church in the Netherlands, the author of the first Fante/Mfantse-Dutch Grammar in Ghana as well as the first translator of the Ten Commandments, Twelve Articles of Faith and parts of the Catechism into Fante/Mfantse. However, he is also remembered as the first African to argue in writing that slavery was compatible with Christianity in the public lecture that he delivered at Leiden in 1742 on the topic, De Servitute Libertati Christianae Non Contraria. The Latin original was soon translated into Dutch and became so popular in the Netherlands that it was reprinted five times in the first year of publication. This contribution will pose the question: Was Capitein a sell-out who soothed the Dutch colonial conscience as he argued with scholarly vigour in his dissertation that the Bible did not prohibit slavery and that it was therefore permissible to continue with the practice in the eighteenth century; or was he resisting the system by means of mimicry due to his hybrid identity - as an African with a European education - who wanted to spread the Christian message and be an educator of his people?

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