The ARTEMIS simulations: stellar haloes of Milky Way-mass galaxies

We introduce the Assembly of high-ResoluTion Eagle-simulations of MIlky Way-type galaxieS (ARTEMIS) simulations, a new set of 42 zoomed-in, high-resolution (baryon particle mass of ≈2×104M⊙h−1⁠), hydrodynamical simulations of galaxies residing in haloes of Milky Way mass, simulated with the EAGLE galaxy formation code with re-calibrated stellar feedback. In this study, we analyse the structure of stellar haloes, specifically the mass density, surface brightness, metallicity, colour, and age radial profiles, finding generally very good agreement with recent observations of local galaxies. The stellar density profiles are well fitted by broken power laws, with inner slopes of ≈−3, outer slopes of ≈−4, and break radii that are typically ≈20–40 kpc. The break radii generally mark the transition between in situ formation and accretion-driven formation of the halo. The metallicity, colour, and age profiles show mild large-scale gradients, particularly when spherically averaged or viewed along the major axes. Along the minor axes, however, the profiles are nearly flat, in agreement with observations. Overall, the structural properties can be understood by two factors: that in situ stars dominate the inner regions and that they reside in a spatially flattened distribution that is aligned with the disc. Observations targeting both the major and minor axes of galaxies are thus required to obtain a complete picture of stellar haloes

The BAHAMAS project: effects of dynamical dark energy on large-scale structure

Computational astrophysic

Science : experimental sensibilities in practice.

How could social scientists and cultural theorists take responsibility in engaging with science? How might they develop an experimental sensibility to the links between the production of knowledge and the production of existence or forms of life? Critically outlining key fields in the social and cultural studies of science, we interrogate a number of approaches to these questions. The first approach tries to make sense of how science operates in relation to economic, political and cultural forces. The second analyses science as a form of embodied work or practice. The third engages with science as collaborative-collective elaboration of events, ranging across cultural theory, contemporary art and participant ethnographies. This outline sketches a vector of responsibility across this diverse range of engagements, suggesting that contemporary movements between science and other knowledges constitute ethical and political imperatives

Can consumers enforce environmental regulations? The role of the market in hazardous waste compliance

We examine the U.S. hazardous waste management industry to assess the role that consumers play in encouraging environmental compliance. We first examine whether environmental performance affects consumer demand and find that noncompliance does decrease demand, at least in the short term. Next we consider whether market characteristics affect compliance behavior. While we do not find evidence that market size affects behavior, local competition does appear to increase compliance. However, as competition becomes less localized, it has a smaller effect. Finally, regardless of the pressures exerted by consumers to comply, commercial managers are less likely to be in compliance than on-site managers. Copyright Springer Science+Business Media, LLC 2007Commercial environmentalism, Compliance, Enforcement, Hazardous waste, Market size, Competition, Q28, K42, D21,