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Since the discovery of periodic variability of Class II methanol masers associated with high-mass star formation, several possible driving mechanisms have been proposed to explain this phenomenon. Here the colliding wind binary (CWB) hypothesis is proposed to describe the periodic variability. It is shown that the recombination of a partially ionized gas describes the flare profiles remarkably well. In addition, the quiescent state flux density is also described remarkably well by the time-dependent change of the electron density. This suggests that the periodicity is caused by the time-dependent change in the radio free-free emission from the background HII regions against which the maser is projected.
Euclid is a Europe-led cosmology space mission dedicated to a visible and near infrared survey of the entire extra-galactic sky. Its purpose is to deepen our knowledge of the dark content of our Universe. After an overview of the Euclid mission and science, this contribution describes how the community is getting organized to face the data analysis challenges, both in software development and in operational data processing matters. It ends with a more specific account of some of the main contributions of the Swiss Science Data Center (SDC-CH).
Begun in 1874 and published in 1880, a detailed survey of the stones of Stonehenge was one of the earliest works of William Matthew Flinders Petrie (1853–1942), the energetic archaeologist who is remembered as a pioneering Egyptologist. It is reissued here alongside Sir Richard Colt Hoare's 1829 analysis of the barrows surrounding Stonehenge, thus giving modern readers a valuable two-part snapshot of nineteenth-century investigations into this famous site. Hoare (1758–1838), a Wiltshire baronet with a keen interest in archaeology and topography, conducted excavations on the site of the stones in the early 1800s, which were later referred to by Petrie, whose measurements were much more accurate (up to one tenth of an inch). Petrie's numbering system for the stones, as set out in this publication, is still in use today. Many of his groundbreaking works in Egyptology are also reissued in the Cambridge Library Collection.