Atmospheric Calorimetry above 1019^{19} eV: Shooting Lasers at the Pierre Auger Cosmic-Ray Observatory

The Pierre Auger Cosmic-Ray Observatory uses the earth's atmosphere as a calorimeter to measure extensive air-showers created by particles of astrophysical origin. Some of these particles carry joules of energy. At these extreme energies, test beams are not available in the conventional sense. Yet understanding the energy response of the observatory is important. For example, the propagation distance of the highest energy cosmic-rays through the cosmic microwave background radiation (CMBR) is predicted to be strong function of energy. This paper will discuss recently reported results from the observatory and the use of calibrated pulsed UV laser "test-beams" that simulate the optical signatures of ultra-high energy cosmic rays. The status of the much larger 200,000 km$^3$ companion detector planned for the northern hemisphere will also be outlined.Comment: 6 pages, 11 figures XIII International Conference on Calorimetry in High Energy Physic

The Natural History of The Silkewormes and their Flies

Images published with permission of The British Library Board (434.f.10), the Huntington Library and Proquest. Further reproduction is prohibited.Images published with permission of The British Library Board (434.f.10), the Huntington Library and Proquest. Further reproduction is prohibited.Images published with permission of The British Library Board (434.f.10), the Huntington Library and Proquest. Further reproduction is prohibited.Images published with permission of The British Library Board (434.f.10), the Huntington Library and Proquest. Further reproduction is prohibited.This study examines the overlap between natural philosophy and humanist imitation in two works by Thomas Moffet: his reference work Insectorum sive Minimorum Animalum Theatrum (written c.1589) and his poem The Silkewormes, and their Flies (1599). Both works draw extensively on contemporary and classical authors in order to create intertextual collages that look backwards towards the natural unity found in the Garden of Eden. This leads me to argue that The Silkewormes’ compositional style shares more in common with Guillaume de Saluste, Sieur Du Bartas's Sepmaine (1578, 1584) than with Virgilian didactic poetry. I consider throughout Elizabethan notions of authority, composition and originality, and conclude that Silkewormes merits critical attention for its skilful synthesis of diverse material in creating a work appropriate for Mary Herbert and her household at Wilton.Arts and Humanities Research Counci

The Environments of SLACS Gravitational Lenses

We report on an investigation of the environments of the SLACS sample of gravitational lenses. The local and global environments of the lenses are characterized using SDSS photometry and, when available, spectroscopy. We find that the lens systems that are best modelled with steeper than isothermal density profiles are more likely to have close companions than lenses with shallower than isothermal profiles. This suggests that the profile steepening may be caused by interactions with a companion galaxy as indicated by N-body simulations of group galaxies. The global environments of the SLACS lenses are typical of non-lensing SDSS galaxies with comparable properties to the lenses, and the richnesses of the lens groups are not as strongly correlated with the lens density profiles as the local environments. Furthermore, we investigate the possibility of line-of-sight contamination affecting the lens models but do not find a significant over-density of sources compared to lines of sight without lenses.Comment: 5 pages, 4 figures, accepted for publication in MNRA