Galaxy Kinematics With Virus-P: The Dark Matter Halo Of M87

We present two-dimensional stellar kinematics of M87 out to R = 238 '' taken with the integral field spectrograph VIRUS-P. We run a large set of axisymmetric, orbit-based dynamical models and find clear evidence for a massive dark matter halo. While a logarithmic parameterization for the dark matter halo is preferred, we do not constrain the dark matter scale radius for a Navarro-Frenk-White (NFW) profile and therefore cannot rule it out. Our best-fit logarithmic models return an enclosed dark matter fraction of 17.2(-5.0)(+5.0)% within one effective radius (R-e congruent to 100 ''), rising to 49.4(-8.8)(+7.2)% within 2 R-e. Existing SAURON data (R <= 13 ''), and globular cluster (GC) kinematic data covering 145 '' <= R <= 554 '' complete the kinematic coverage to R = 47 kpc (similar to 5R(e)). At this radial distance, the logarithmic dark halo comprises 85.3(-2.4)(+2.5)% of the total enclosed mass of 5.7(-0.9)(+1.3) x 10(12) M-circle dot making M87 one of the most massive galaxies in the local universe. Our best-fit logarithmic dynamical models return a stellar mass-to-light ratio (M/L) of 9.1(-0.2)(+0.2) (V band), a dark halo circular velocity of 800(-25)(+75) km s(-1), and a dark halo scale radius of 36(-3)(+7) kpc. The stellar M/L, assuming an NFW dark halo, is well constrained to 8.20(-0.10)(+0.05) (V band). The stars in M87 are found to be radially anisotropic out to R congruent to 0.5 R-e, then isotropic or slightly tangentially anisotropic to our last stellar data point at R = 2.4 R-e where the anisotropy of the stars and GCs are in excellent agreement. The GCs then become radially anisotropic in the last two modeling bins at R = 3.4 R-e and R = 4.8 R-e. As one of the most massive galaxies in the local universe, constraints on both the mass distribution of M87 and anisotropy of its kinematic components strongly inform our theories of early-type galaxy formation and evolution in dense environments.Astronom

An Investigation of the Loss of Planet-Forming Potential in Intermediate Sized Young Embedded Star Clusters

A large fraction of stars forming in our galaxy are born within clusters embedded in giant molecular clouds. In these environments, the background UV radiation fields impinging upon circumstellar disks can often dominate over the radiation fields produced by each disk's central star. As a result, this background radiation can drive the evaporation of circumstellar disks and lead to the loss of planet forming potential within a cluster. This paper presents a detailed analysis of this process for clusters whose stellar membership falls within the range $100 \le N \le 1000$. For these intermediate-sized clusters, the background UV field is often dominated by the most massive stellar member. Due to the steep slope of the initial mass function, the amount of background UV light that bathes clusters of similar size displays significant variance. As a result, we perform a statistical analysis of this problem by calculating distributions of FUV flux values impinging upon star/disk systems for several cluster scenarios. We find that in the absence of dust attenuation, giant planet formation would likely be inhibited in approximately half of systems forming within intermediate-sized clusters regardless of stellar membership. In contrast, the presence of dust can significantly lower this value, with the effect considerably more pronounced in more populated clusters.Comment: Accepted for publication in PAS

Modelling cost-effective air pollution abatement: a multi-period linear programming approach

Improvements in air quality for some criteria pollutants in Sydney, Wollongong and the Lower Hunter have been achieved, whilst further improvements are required for others.Environmental Economics and Policy,

“Best Care on Home Ground” Versus “Elitist Healthcare”: Concerns and Competing Expectations for Medical Tourism Development in Barbados

Introduction Many countries have demonstrated interest in expanding their medical tourism sectors because of its potential economic and health system benefits. However, medical tourism poses challenges to the equitable distribution of health resources between international and local patients and private and public medical facilities. Currently, very little is known about how medical tourism is perceived among front line workers and users of health systems in medical tourism ‘destinations’. Barbados is one such country currently seeking to expand its medical tourism sector. Barbadian nurses and health care users were consulted about the challenges and benefits posed by ongoing medical tourism development there. Methods Focus groups were held with two stakeholder groups in May, 2013. Nine (n&thinsp;=&thinsp;9) citizens who use the public health system participated in the first focus group and seven (n&thinsp;=&thinsp;7) nurses participated in the second. Each focus group ran for 1.5&nbsp;hours and was digitally recorded. Following transcription, thematic analysis of the digitally coded focus group data was conducted to identify cross-cutting themes and issues. Results Three core concerns regarding medical tourism’s health equity impacts were raised; its potential to 1) incentivize migration of health workers from public to private facilities, 2) burden Barbados’ lone tertiary health care centre, and 3) produce different tiers of quality of care within the same health system. These concerns were informed and tempered by the existing a) health system structure that incorporates both universal public healthcare and a significant private medical sector, b) international mobility among patients and health workers, and c) Barbados’ large recreational tourism sector, which served as the main reference in discussions about medical tourism’s impacts. Incorporating these concerns and contextual influences, participants’ shared their expectations of how medical tourism should locally develop and operate. Conclusions By engaging with local health workers and users, we begin to unpack how potential health equity impacts of medical tourism in an emerging destination are understood by local stakeholders who are not directing sector development. This further outlines how these groups employ knowledge from their home context to ground and reconcile their hopes and concerns for the impacts posed by medical tourism

Mitigating Projected Impacts of Climate Change and Building Resiliency through Permaculture: a Community ‘Bee Inspired Gardens’ Movement in the Desert Southwest, USA

Permaculture, an integrative design process creating resilient and productive landscapes and communities, can serve as a useful mitigation tool for projected climate change impacts. In the United States, the desert southwest town of Moab, Utah, has employed permaculture design in a community initiative called ‘Bee Inspired Gardens.’ This initiative has harnessed social capital to create resilient landscapes demonstrating pollinator health, water conservation, and perennial food and forage systems. Bee Inspired Gardens have been designed at a University, middle school, charter school, Bureau of Land Management property, hotel, public park, environmental education non-profit, and more. Community members are now harvesting fruit and seeds from existing garden sites, attending educational workshops at the gardens, and volunteering to help with the design and implementation processes. In the desert southwest, climate change projections are for hotter, drier, weather. In preparing for, and working to mitigate, projected impacts, initiatives like ‘Bee Inspired Gardens’ can serve as models for other communities looking to take positive action in climate mitigation and adaptation

Oscillation and the mean ergodic theorem for uniformly convex Banach spaces

Let B be a p-uniformly convex Banach space, with p >= 2. Let T be a linear operator on B, and let A_n x denote the ergodic average (1 / n) sum_{i< n} T^n x. We prove the following variational inequality in the case where T is power bounded from above and below: for any increasing sequence (t_k)_{k in N} of natural numbers we have sum_k || A_{t_{k+1}} x - A_{t_k} x ||^p <= C || x ||^p, where the constant C depends only on p and the modulus of uniform convexity. For T a nonexpansive operator, we obtain a weaker bound on the number of epsilon-fluctuations in the sequence. We clarify the relationship between bounds on the number of epsilon-fluctuations in a sequence and bounds on the rate of metastability, and provide lower bounds on the rate of metastability that show that our main result is sharp

Promoting Social Responsibility amongst Health Care Users: Medical Tourists’ Perspectives on an Information Sheet Regarding Ethical Concerns in Medical Tourism

Background Medical tourists, persons that travel across international borders with the intention to access non-emergency medical care, may not be adequately informed of safety and ethical concerns related to the practice of medical tourism. Researchers indicate that the sources of information frequently used by medical tourists during their decision-making process may be biased and/or lack comprehensive information regarding individual safety and treatment outcomes, as well as potential impacts of the medical tourism industry on third parties. This paper explores the feedback from former Canadian medical tourists regarding the use of an information sheet to address this knowledge gap and raise awareness of the safety and ethical concerns related to medical tourism. Results According to feedback provided in interviews with former Canadian medical tourists, the majority of participants responded positively to the information sheet and indicated that this document prompted them to engage in further consideration of these issues. Participants indicated some frustration after reading the information sheet regarding a lack of know-how in terms of learning more about the concerns discussed in the document and changing their decision-making. This frustration was due to participants’ desperation for medical care, a topic which participants frequently discussed regarding ethical concerns related to health care provision. Conclusions The overall perceptions of former medical tourists indicate that an information sheet may promote further consideration of ethical concerns of medical tourism. However, given that these interviews were performed with former medical tourists, it remains unknown whether such a document might impact upon the decision-making of prospective medical tourists. Furthermore, participants indicated a need for an additional tool such as a website for continued discussion about these concerns. As such, along with dissemination of the information sheet, future research implications should include the development of a website for ongoing discussion that could contribute to a raised awareness of these concerns and potentially increase social responsibility in the medical tourism industry

Tourism Discourse and Medical Tourists’ Motivations to Travel

This paper aims to respond to a knowledge gap regarding the motivations of medical tourists, the term used to describe persons that travel across borders with the intention of accessing medical care. Commonly cited motivations for engaging in medical tourism are typically based on speculation and provide generalizations for what is a contextualized practice. This research paper aims to complicate the commonly discussed motivations of medical tourists to provide a richer understanding of these motivations and the various contexts in which medical tourists may choose to travel for medical care. Design/methodology/approach – Drawing on semi-structured interviews with 32 former Canadian medical tourists, this study uses the Iso-Ahola\u27s motivation theory to analyze tourists\u27 motivations. Quotations from participants were used to highlight core themes relevant to critical theories of tourism. Findings – Participants\u27 discussions illuminated motivations to travel related to personal and interpersonal seeking as well as personal and interpersonal escaping. These motivations demonstrate the appropriateness of applying critical theories of tourism to the medical tourism industry. Research limitations/implications – This research is limited in its ability to link various motivations with particular contexts such as medical procedure and personal demographics. However, this study demonstrates that the three commonly cited motivations of medical tourists might oversimplify this phenomenon. &nbsp; Originality/value – By providing new insight into medical tourists\u27 motivations, this paper expands the conversation about medical tourists\u27 decision-making and how this is informed by tourism discourse. This insight may contribute to improved guidance for medical tourism stakeholders for more ethical and safe practices