Galaxy Zoo: Mergers – Dynamical models of interacting galaxies

The dynamical history of most merging galaxies is not well understood. Correlations between galaxy interaction and star formation have been found in previous studies, but require the context of the physical history of merging systems for full insight into the processes that lead to enhanced star formation. We present the results of simulations that reconstruct the orbit trajectories and disturbed morphologies of pairs of interacting galaxies. With the use of a restricted three-body simulation code and the help of citizen scientists, we sample 105 points in parameter space for each system. We demonstrate a successful recreation of the morphologies of 62 pairs of interacting galaxies through the review of more than 3 million simulations. We examine the level of convergence and uniqueness of the dynamical properties of each system. These simulations represent the largest collection of models of interacting galaxies to date, providing a valuable resource for the investigation of mergers. This paper presents the simulation parameters generated by the project. They are now publicly available in electronic format at http://data.galaxyzoo.org/mergers.html. Though our best-fitting model parameters are not an exact match to previously published models, our method for determining uncertainty measurements will aid future comparisons between models. The dynamical clocks from our models agree with previous results of the time since the onset of star formation from starburst models in interacting systems and suggest that tidally induced star formation is triggered very soon after closest approach

Business ethics competencies research: implications for Canadian practitioners

This paper describes a proposed framework of knowledge, skills, abilities, and other characteristics (KSAOs) that a practitioner who is competent in business ethics, compliance, or integrity should possess. These competencies may be leveraged as key input to selecting content for an institutionalized business ethics training program. The focus in this paper is on the management problem of 'What competencies are important for job performance of business ethics practitioners'. Phase I consisted of developing a provisional taxonomy of business ethics competencies and Phase II involved academic and industry practitioners implicated in business ethics to validate the conceptually developed provisional taxonomy of business ethics competencies to eventually make recommendations regarding the selection of business ethics training content. The contribution to the business ethics competency-based management knowledge that is presented in this paper is a proposed business ethics competency model and the implications of this model for Canadian practitioners are discussed