An Exploration of the Offset Hypothesis Using Disaggregate Data:The Case of Airbags and Antilock Brakes

The offset hypothesis predicts consumers adapt to innovations that improve safety by becoming less vigilant about safety. Previous tests have used aggregate data that may confound the effect of a safety policy with those consumers who are most affected by it. We test the hypothesis using disaggregate data to analyze the effects of airbags and antilock brakes on automobile safety. We find that safety-conscious drivers are more likely than other drivers to acquire airbags and antilock brakes but these safety devices do not have a significant effect on collisions or injuries, suggesting drivers trade off enhanced safety for speedier trips.

Galaxy gas ejection in radio galaxies: the case of 3C 35

We report results from XMM-Newton and Chandra observations of the nearby (z = 0.067) giant radio galaxy 3C 35. We find evidence for an X-ray emitting gas belt, orthogonal to and lying between the lobes of 3C 35, which we interpret as fossil-group gas driven outwards by the expanding radio lobes. We also detect weak emission from a second, more extended group-type environment, as well as inverse-Compton X-ray emission from the radio lobes. The morphological structure of the radio lobes and gas belt point to co-evolution. Furthermore, the radio source is powerful enough to eject galaxy-scale gas out to distances of 100kpc, and the ages of the two features are comparable (tsynch~140Myr, tbelt~80 Myr). The destruction of 3C 35's atmosphere may offer clues as to how fossil systems are regulated: radio galaxies need to be of power comparable to 3C 35 to displace and regulate fossil-group gas. We discuss the implications of the gas belt in 3C 35 in terms of AGN fuelling and feedback.Comment: 18 pages, accepted to MNRA

Connected to the Community

This presentation discusses community engagement at UNO

Man or woman? perception of gender through costume

Knowledge of Scandinavian costume history is based on information gathered from a large variety of sources. Actual costumes of skin and textiles are off course key finds but also prehistoric iconography offers a unique opportunity for comparative costumes studies. In this article quick guidelines for identification of male and female costumes seen on goilfoil figures dated to the Late Iron Age are presented. Further the recently excavated figuring from Lejre in Denmark is used as an example of how the guidelines can be used and applied to other find categories. Thus, the article offers an alternative interpretation of the figurine as a depiction of a female