Ly-alpha excess in high redshift radio galaxies: a signature of star formation

About 54% of radio galaxies at z>3 and 8% of radio galaxies at 2<z<3 show unusually strong Ly-alpha emission, compared with the general population of high redshift (z>2) radio galaxies. These Ly-alpha excess objects (LAEs) show Ly-alpha/HeII values consistent with or above standard photoionization model predictions. We show that the most successful explanation is the presence of a young stellar population which provides the extra supply of ionizing photons required to explain the Ly-alpha excess in at least the most extreme LAEs (probably in all of them). The measurement of unusually high Ly-alpha ratios in the extended gas of some high redshift radio galaxies suggests that star formation activity occurs in spatial scales of tens of kpc. We argue that, although the fraction of LAEs may be incompletely determined, both at 23, the much larger fraction of LAEs found at z>3 is a genuine redshift evolution and not due to selection effects. Therefore, our results suggest that the radio galaxy phenomenon is more often associated with a massive starburst at z>3 than at z<3.Comment: 14 pages, 5 figures, accepted for publication in MNRA

Implementación inicial del sistema de información docente de la Facultad de Informática

Memoria del proyecto Innova-Gestión 441 de la convocatoria 2020/2021 "Implementación inicial del sistema de información docente de la Facultad de Informática" que consistía en la implementación de una primera versión de sistema de información interno para la gestión de Trabajos de Fin de Grado para ser utilizado en la facultad de informática

Renovación del sistema de información docente de la Facultad de Informática

Memoria del proyecto Innova-Gestión 301 de la convocatoria 2019/2020 "Renovación del sistema de información docente de la Facultad de Informática" que consistía en la implementación de una primera versión de sistema de información interno para la gestión de horarios, fichas docentes, tutorías y otros datos relevantes para la docencia para ser utilizado en la facultad de informática

El «Padrón» y la «Manta» de Tudela Documentos acerca de los judeoconversos y la Inquisición en Navarra

The historians of Navarre in the late Medieval and Early Modern period repeatedly mention a document containing a roll with the names of Jewish householders of Tudela who took baptism in 1498 and agreed to pay in 1510 a tribute to the Crown in order to avoid inquisitorial investigation. This document has been mistakenly identified with the “manta de los judíos” (‘Jews’ blanket’), a sambenito hanging in the cathedral of Tudela showing the converts, and their descendants, that were convicted by the inquisitorial court. In the 17th century, both documents were used as evidence in purity of blood exams brought before the royal court of Navarre. This article analyzes the misunderstanding and investigates the origins and later uses of the documents, describing the copies of the roll that have been preserved.Los historiadores de los judíos y convertidos navarros citan reiteradamente un documento que contiene una nómina completa o «padrón», compuesta por los cabezas de familia judíos bautizados en 1498, que en 1510 pactaron el pago de un tributo a la Corona con objeto de garantizar su inmunidad ante la actuación inquisitorial. De manera errónea se ha denominado a tal nómina «manta de los judíos», por confusión con un gran lienzo o sambenito colgado en la iglesia colegial de Tudela que reproducía los sambenitos que se habían visto obligados a portar los condenados por la Inquisición. Ambos documentos, nómina y «manta», fueron utilizados como prueba en los procesos de limpieza de sangre ante los tribunales reales de Navarra durante el siglo XVII. Este artículo desentraña esta confusión, presenta los datos conocidos sobre la «manta» que colgaba en Tudela, describe las copias conservadas del «padrón», y analiza el origen y posterior uso de los documento

Spread of a SARS-CoV-2 variant through Europe in the summer of 2020.

Following its emergence in late 2019, the spread of SARS-CoV-21,2 has been tracked by phylogenetic analysis of viral genome sequences in unprecedented detail3–5. Although the virus spread globally in early 2020 before borders closed, intercontinental travel has since been greatly reduced. However, travel within Europe resumed in the summer of 2020. Here we report on a SARS-CoV-2 variant, 20E (EU1), that was identified in Spain in early summer 2020 and subsequently spread across Europe. We find no evidence that this variant has increased transmissibility, but instead demonstrate how rising incidence in Spain, resumption of travel, and lack of effective screening and containment may explain the variant’s success. Despite travel restrictions, we estimate that 20E (EU1) was introduced hundreds of times to European countries by summertime travellers, which is likely to have undermined local efforts to minimize infection with SARS-CoV-2. Our results illustrate how a variant can rapidly become dominant even in the absence of a substantial transmission advantage in favourable epidemiological settings. Genomic surveillance is critical for understanding how travel can affect transmission of SARS-CoV-2, and thus for informing future containment strategies as travel resumes. © 2021, The Author(s), under exclusive licence to Springer Nature Limited

Intermediate Resolution Spectroscopy Of The Radio Galaxy B2 0902+34 At Z ≈ 3.4

We have carried out optical spectroscopic observations at intermediate spectral resolution of the massive high redshift radio galaxy 0902+34 at z ≈ 3.39. This source was first identified by Lilly (1988) (from hereafter L88). The study of high redshift radio galaxies is interesting to analyze the physical conditions of the early universe and the galaxy evolution at cosmological redshifts. It has been claimed that some of these systems may be protogalaxies in the process of formation. Indications for this are the flat spectrum and the absence of the 4000 Å break, features which have already been observed in many cases. In particular, observations in the spectral range from V to K suggest that 0902+34 is a young galaxy (Eisenhardt and Dickinson 1992). Recent radio observations of the 21 cm line of neutral hydrogen have detected (Uson et. al. 1991) an absorption against the radio continuum source. This absorption could also leave a track in the optical, redwards the Lyα line. Our observations were carried out with the ISIS spectrograph at the 4.2 m William Herschel Telescope (seeing ≈ 1.2–1.6 arcsec). A spectral dispersion of 0.78 Å/pixel (blue arm) and 1.38 Å/pixel (red arm) was obtained. A long slit of width 3″ was used providing a spectral resolution of ≈ 5.4 Å in the blue arm and of ≈ 9.5 Å in the red one. Both resolutions are a clear improvement over that achieved by L88 of 20 Å, allowing us to resolve the Lyα line (and its possible structure) and any other possible strong features appearing in the spectral range observed (e. g., C IV λ1549, He II λ1640,…).We acknowledge financia! support from the spanish DGICYT, project PB92-0741. Partial financia! support for this project was provided by the Comission ofthe European Union and their Human Capital and Mobility Contract CHRX CT92-0033. The William Herschel Telescope is operated by the Royal Greenwich Observatory at the spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias, on behalf of the Science and Engineering Research Council of the United Kingdom and the Netherlands Organization for Scientific Research

Search for modulators of VEGF-KDR interaction: Hydrocarbon-bridged VEGF derived peptides

Trabajo presentado en el 30th European Peptide Symposium, celebrado en Helsinki (Finlandia) del 31 de agosto al 05 de septiembre de 2008