Colliding winds in WR21 and WR31 -- I. The X-ray view

WR21 and WR31 are two WR+O binaries with short periods, quite similar to the case of V444 Cyg. The XMM-Newton observatory has monitored these two objects and clearly revealed phase-locked variations as expected from colliding winds. The changes are maximum in the soft band (0.5--2.keV, variations by a factor 3--4) where they are intrinsically linked to absorption effects. The increase in absorption due to the dense WR wind is confirmed by the spectral analysis. The flux maximum is however not detected exactly at conjunction with the O star in front but slightly afterwards, suggesting Coriolis deflection of the collision zone as in V444 Cyg. In the hard band (2.--10. keV), the variations (by a factor of 1.5--2.0) are much more limited. Because of the lower orbital inclinations, eclipses as observed for V444 Cyg are not detected in these systems.Comment: accepted for publication by MNRA

Learning Community Psychology Practice Competencies: Student Pathways through the Applied Community Psychology Specialization

Community psychology practice competencies provide a framework of skills students can learn to promote social change processes in communities. However, there is great overlap and cross-over of skill sets among some competencies. The complex nature of learning any competency will likely take multiple learning experiences to master and span years beyond a student’s exit from training to achieve expertise. Programs training students in practice competencies can benefit from working collaboratively with students to better understand how students develop experience and skill in utilizing competencies across the curriculum. This article explores five narrative accounts of how students and graduates learned selected community psychology practice competencies through their training in the Applied Community Psychology (ACP) specialization at Antioch University Los Angeles. Students and graduates were asked to select a competency and write a two-page narrative of how they learned the competency through their training in the ACP specialization. Implications for academic program development and training in community psychology practice competencies are discussed

Learning Community Psychology Practice Competencies: Student Pathways through the Applied Community Psychology Specialization

Community psychology practice competencies provide a framework of skills students can learn to promote social change processes in communities. However, there is great overlap and cross-over of skill sets among some competencies. The complex nature of learning any competency will likely take multiple learning experiences to master and span years beyond a student’s exit from training to achieve expertise. Programs training students in practice competencies can benefit from working collaboratively with students to better understand how students develop experience and skill in utilizing competencies across the curriculum. This article explores five narrative accounts of how students and graduates learned selected community psychology practice competencies through their training in the Applied Community Psychology (ACP) specialization at Antioch University Los Angeles. Students and graduates were asked to select a competency and write a two-page narrative of how they learned the competency through their training in the ACP specialization. Implications for academic program development and training in community psychology practice competencies are discussed

Disabled people and the Post20 15 Development Goal Agenda through a disability studies lens

Abstract: The purpose of this study was to examine the role and visibility of disabled people in the discourses of various global policy processes related to sustainable development and the Post-2015 development agenda. This article makes several recommendations for strengthening the role of disabled people in these discourses. The research addresses the question of how the disability community and sustainable development community relate to each other in these discourses. This study provides quantitative and qualitative data on three aspects of the relationship. One set of data highlights who is seen as a stakeholder in general and the visibility of disabled people in the social sustainability, sustainable consumption, Rio+20 and Post-2015 development agenda proposals discourses and what participants of the online consultation for a disability inclusive development agenda towards 2015 and beyond had to say about the issues of visibility of disabled people in development discourses. A second set of data illuminates the attitudes towards disabled people evident in the SD discourses including through the eyes of the participant of the online consultation for a disability inclusive development agenda towards 2015 and beyond. The final set of data compares the goals and actions seen as desirable for the advancement of SD evident in the SD literature covered and the online consultation for a disability inclusive development agenda towards 2015 and beyond. This study interpreted the data through a disability studies lens. The study found that OPEN ACCESS Sustainability 2013, 5 4153 disabled people were barely visible to invisible in the SD literature covered, that the goals and actions proposed in the SD discourses are of high relevance to disabled people but that these discussions have generally not been explicitly linked to disabled people. It found further that disabled people have clear ideas why they are invisible, what the problems with development policies are and what needs to happen to rectify the problems. It found also that there was a lack of visibility of various SD areas and goals within the disability discourse. This paper provides empirical data that can be used to further the goal of mainstreaming of disabled people into the SD and Post-2015 development discourses as asked for in various high-level UN documents. However, we posit that the utility of our paper goes beyond the disability angle. Our quantitative data also highlights other forms of social group visibility unevenness in the literature and as such, we argue that the data we present in this paper is also of use for other stakeholders such as youth, women and indigenous people and also for NGOs and policy makers

CANUCS: An Updated Mass and Magnification Model of Abell 370 with JWST

We report an updated mass and magnification model of galaxy cluster Abell 370 using new NIRCam and NIRISS data from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). Using Lenstool and a combination of archival HST and MUSE data with new JWST data as constraints, we derive an improved gravitational lensing model and extract magnifications of background galaxies with uncertainties. Using our best fit model, we perform a search for new multiply imaged systems via predicted positions. We report no new multiply imaged systems with identifiable redshifts, likely due to already very deep HST and Spitzer data, but confirm a $z\sim8$ multiply imaged system by measuring its redshift with NIRISS and NIRSpec spectra. We find that the overall shape of the critical curve for a source at $z = 9.0$ is similar to previous models of Abell 370, with small changes. We investigate the $z\sim8$ galaxy with two images observable with an apparent magnitude in the F125W band of $26.0\pm0.2$ and $25.6\pm0.1$. After correcting for the magnifications of the images, 7.2$^{+0.2}_{-1.2}$ and 8.7$^{+0.4}_{-0.4}$, we use SED fitting to find an intrinsic stellar mass of log($M^*/M_{\odot})$ = 7.35$^{+0.04}_{-0.05}$, intrinsic SFR of 3.5$^{+2.2}_{-1.4}$ M$_{\odot}$/yr, and $M_{UV}$ of -21.3$^{+0.2}_{-0.2}$, which is close to the knee of the luminosity function at that redshift. Our model, and corresponding magnification, shear, and convergence maps are available on request and will be made publicly available on MAST in a CANUCS data release (DOI: 10.17909/ph4n-6n76).Comment: 15 page

Lockdown and licensed premises: COVID-19 lessons for alcohol policy

Introduction The COVID-19 pandemic necessitated unprecedented changes in alcohol availability, including closures, curfews and restrictions. We draw on new data from three UK studies exploring these issues to identify implications for premises licensing and wider policy. Methods (i) Semi-structured interviews (n = 17) with licensing stakeholders in Scotland and England reporting how COVID-19 has reshaped local licensing and alcohol-related harms; (ii) semi-structured interviews (n = 15) with ambulance clinicians reporting experiences with alcohol during the pandemic; and (iii) descriptive and time series analyses of alcohol-related ambulance callouts in Scotland before and during the first UK lockdown (1 January 2019 to 30 June 2020). Results COVID-19 restrictions (closures, curfews) affected on-trade premises only and licensing stakeholders highlighted the relaxation of some laws (e.g. on takeaway alcohol) and a rise in home drinking as having long-term risks for public health. Ambulance clinicians described a welcome break from pre-pandemic mass public intoxication and huge reductions in alcohol-related callouts at night-time. They also highlighted potential long-term risks of increased home drinking. The national lockdown was associated with an absolute fall of 2.14 percentage points [95% confidence interval (CI) −3.54, −0.74; P = 0.003] in alcohol-related callouts as a percentage of total callouts, followed by a daily increase of +0.03% (95% CI 0.010, 0.05; P = 0.004). Discussion and Conclusions COVID-19 gave rise to both restrictions on premises and relaxations of licensing, with initial reductions in alcohol-related ambulance callouts, a rise in home drinking and diverse impacts on businesses. Policies which may protect on-trade businesses, while reshaping the night-time economy away from alcohol-related harms, could offer a ‘win–win’ for policymakers and health advocates

Λ\LambdaCDM not dead yet: massive high-z Balmer break galaxies are less common than previously reported

Early JWST observations that targeted so-called double-break sources (attributed to Lyman and Balmer breaks at $z>7$), reported a previously unknown population of very massive, evolved high-redshift galaxies. This surprising discovery led to a flurry of attempts to explain these objects' unexpected existence including invoking alternatives to the standard $\Lambda$CDM cosmological paradigm. To test these early results, we adopted the same double-break candidate galaxy selection criteria to search for such objects in the JWST images of the CAnadian NIRISS Unbiased Cluster Survey (CANUCS), and found a sample of 19 sources over five independent CANUCS fields that cover a total effective area of $\sim60\,$arcmin$^2$ at $z\sim8$. However, (1) our SED fits do not yield exceptionally high stellar masses for our candidates, while (2) spectroscopy of five of the candidates shows that while all five are at high redshifts, their red colours are due to high-EW emission lines in star-forming galaxies rather than Balmer breaks in massive, evolved systems. Additionally, (3) field-to-field variance leads to differences of $\sim 1.5$ dex in the maximum stellar masses measured in the different fields, suggesting that the early single-field JWST observations may have suffered from cosmic variance and/or sample bias. Finally, (4) we show that the presence of even a single massive outlier can dominate conclusions from small samples such as those in early JWST observations. In conclusion, we find that the double-break sources in CANUCS are not sufficiently massive or numerous to warrant questioning the standard $\Lambda$CDM paradigm.Comment: V2: correction of display problem of Fig.1 in Chrome browser. Submitted to MNRAS, 10 pages (+4 in Appendix), 5 figures (+4), 1 table (+1

Gamma-ray production from resonant betatron oscillations of accelerated electrons in a plasma wake

The laser-plasma wakefield accelerator is a novel ultra-compact particle accelerator. A very intense laser pulse focused onto plasma can excites plasma density waves. Electrons surfing these waves can be accelerated to very high energies with unprecedented accelerating gradients in excess of 1 GV/cm. While accelerating, electrons undergo transverse betatron oscillations and emit synchrotron-like x-ray radiation into a narrow on-axis cone, which is enhanced when electrons interact with the electromagnetic field of the laser. In this case, the laser can resonantly drive the electron motion, lading to direct laser acceleration. This occurs when the betatron frequency matches the Doppler down-shifted frequency of the laser. As a consequence, the number of photons emitted is strongly enhanced and the critical photon energy is increases to 100’s of ke