Super-orbital variability of LS I+61 degrees 303 at TeV energies

Context. The gamma-ray binary LS I +61º303 is a well-established source from centimeter radio up to very high energy (VHE; E > 100 GeV). The broadband emission shows a periodicity of ∼26.5 days, coincident with the orbital period. A longer (super-orbital) period of 1667 ± 8 days was proposed from radio variability and confirmed using optical and high-energy (HE; E ¿ 100 MeV) gamma-ray observations. In this paper, we report on a four-year campaign performed by MAGIC together with archival data concentrating on a search for a long-timescale signature in the VHE emission from LS I +61º303. Aims. We focus on the search for super-orbital modulation of the VHE emission, similar to that observed at other energies, and on the search for correlations between TeV emission and an optical determination of the extension of the circumstellar disk. Methods. A four-year campaign has been carried out using the MAGIC telescopes. The source was observed during the orbital phases when the periodic VHE outbursts have occurred (φ = 0.55 – 0.75, one orbit = 26.496 days). Additionally, we included archival MAGIC observations and data published by the VERITAS collaboration in these studies. For the correlation studies, LS I +61◦303 has also been observed during the orbital phases where sporadic VHE emission had been detected in the past (φ = 0.75 – 1.0). These MAGIC observations were simultaneous with optical spectroscopy from the LIVERPOOL telescope. Results. The TeV flux of the periodical outburst in orbital phases φ = 0.5 – 0.75 was found to show yearly variability consistent with the long-term modulation of ∼4.5 years found in the radio band. This modulation of the TeV flux can be well described by a sine function with a best-fit period of 1610±58 days. The complete data, including archival observations, span two super-orbital periods. There is no evidence for a correlation between the TeV emission and the mass-loss rate of the Be star, but this may be affected by the strong, short-timescale (as short as intra-day) variation displayed by the Hα fluxes.

"Consolatoria super obitu inclyti principis Hispaniarum Iohannis" de Alfonso Ortiz: introducción, edición crítica, traducción y comentario

The present work submitted as a PhD thesis has the aim of studying from a philological point of view, the Latin text Consolatoria super obitu inclyti principis Hispaniarum Iohannis, written by the Castilian canon Alfonso Ortiz, who lived in the late 15th century in the time of the Catholic Monarchs (Isabel and Fernando), on the death of Prince John, first and only son of the sovereigns. The core of this work is the critical edition (the first complete edition ever made) on the comparison of two extant manuscripts (S and St), the second having the Spanish self-translation of the first. On the basis of this critical text we study the literary references as well as its structure and the literary genre to which it may be ascribed and, besides, we point out some features of the language used therein (Latin), the scope and characteristics of the self-translation and other style and rhetorical topics (e.g. the use of rhythmic clausulae at the end of sentences). Several appendices are added to complete and improve the text-study From that study it may be concluded that although the work follows a long time proven tradition based on medieval religious Ideas, the author, nonetheless, continuously shows within the text that he is willing to adapt that tradition into the new tunes of early Renaissance, not only by means of language and style features, but also through matter nuances that made it clear that life/death concepts were gradually shifting from the medieval times to the ideas of the new epoch. As the value of human life was rising, it needed a more attentive, profound and meticulous consolation through both conceptual and rhetorical arguments...