University of Victoria

About: University of Victoria is a education organization based out in Victoria, British Columbia, Canada. It is known for research contribution in the topics: Population & Galaxy. The organization has 14994 authors who have published 41051 publications receiving 1447972 citations. The organization is also known as: Victoria College.

The Dependence of Cluster Galaxy Star Formation Rates on the Global Environment

Abstract: A comparison of star formation properties as a function of environment is made from the spectra of identically selected cluster and field galaxies in the CNOC 1 redshift survey of over 2000 galaxies in the fields of 15 X-ray luminous clusters at 0.18 < z < 0.55. The ratio of bulge luminosity to total galaxy luminosity (B/T) is computed for galaxies in this sample, and this measure of morphology is compared with the galaxy star formation rate as determined from the [O II] λ3727 emission line. The mean star formation rate of cluster galaxies brighter than Mr=-17.5+5logh is found to vary from 0.17 ± 0.02 h-2 M☉ yr-1 at R200 (1.5-2 h-1 Mpc) to 0.00 ± 0.01 in the cluster center, and it is always less than the mean star formation rate of field galaxies, which is 0.39 ± 0.01 h-2 M☉ yr-1. It is demonstrated that this significant difference is not exclusively a result of the difference in morphological type, as parameterized by the B/T value, by correcting for the B/T-radius relation. The distribution of [O II] equivalent widths among cluster galaxies is skewed toward lower values relative to the distribution for field galaxies of comparable physical size, B/T, and redshift, with a statistical significance of more than 99%. The cluster environment affects not only the morphological mix of the galaxy population but also suppresses the star formation rate within those galaxies, relative to morphologically similar galaxies in the field.

Probing a secluded U(1) at B factories

Abstract: A secluded $\mathrm{U}(1{)}_{S}$ gauge field, kinetically mixed with standard model hypercharge, provides a ``portal'' mediating interactions with a hidden sector at the renormalizable level, as recently exploited in the context of weakly interacting massive particle dark matter. The $\mathrm{U}(1{)}_{S}$ symmetry-breaking scale may naturally be suppressed relative to the weak scale, and so this sector is efficiently probed by medium-energy ${e}^{+}{e}^{\ensuremath{-}}$ colliders. We study the collider signatures of the minimal $\mathrm{U}(1{)}_{S}$ model, focusing on the reach of $B$-factory experiments such as BABAR and BELLE. In particular, we show that Higgs strahlung in the secluded sector can lead to multilepton signatures, which probe the natural range for the kinetic mixing angle $\ensuremath{\kappa}\ensuremath{\sim}{10}^{\ensuremath{-}2}--{10}^{\ensuremath{-}3}$ over a large portion of the kinematically accessible parameter space.

Extreme Weather Events and the Critical Importance of Anticipatory Adaptation and Organizational Resilience in Responding to Impacts

Abstract: Growing scientific evidence suggests that more frequent and severe weather extremes such as heat waves, hurricanes, flooding and droughts will have an increasing impact on organizations, industries and entire economies. These findings call for the development of theoretical and practical frameworks to strengthen the capacity of organizations to respond to such impacts. Yet despite the need to understand what is required to build anticipatory adaptation and organizational resilience to expected impacts, the organizational theory literature offers only limited insights. This paper proposes a comprehensive conceptual framework of organizational adaptation and resilience to extreme weather events for addressing the effects of ecological discontinuities in organizational research and strategic decision-making. Implications and suggestions for future research are offered.