Selection of AGN candidates in the GOODS-South Field through SPITZER/MIPS 24 μ\mum variability

We present a study of galaxies showing mid-infrared variability in data taken in the deepest Spitzer/MIPS 24 $\mu$m surveys in the GOODS-South field. We divide the dataset in epochs and subepochs to study the long-term (months-years) and the short-term (days) variability. We use a $\chi^2$-statistics method to select AGN candidates with a probability $\leq$ 1% that the observed variability is due to statistical errors alone. We find 39 (1.7% of the parent sample) sources that show long-term variability and 55 (2.2% of the parent sample) showing short-term variability. That is, 0.03 sources $\times$ arcmin$^{-2}$ for both, long-term and short-term variable sources. After removing the expected number of false positives inherent to the method, the estimated percentages are 1.0% and 1.4% of the parent sample for the long-term and short-term respectively. We compare our candidates with AGN selected in the X-ray and radio bands, and AGN candidates selected by their IR emission. Approximately, 50% of the MIPS 24 $\mu$m variable sources would be identified as AGN with these other methods. Therefore, MIPS 24 $\mu$m variability is a new method to identify AGN candidates, possibly dust obscured and low luminosity AGN, that might be missed by other methods. However, the contribution of the MIPS 24 $\mu$m variable identified AGN to the general AGN population is small ($\leq$ 13%) in GOODS-South.Comment: Accepted for publication in MNRA

Caracterización petrofísica del Miembro Dolomítico de la Formación Boñar (Cretácico Superior; Cuenca del Duero, España) para su uso como potencial reservorio de CO2

[EN] Boñar Formation (Upper Cretaceous) is a mainly carbonate succession, which outcrops in the North of Duero Basin (Spain). According to the existing data, the Dolomitic Member of this formation appears to be the most suitable for geological storage of CO2. The main objective of this study is to find evidence to support, clarify and specify –at an initial level– the potential of the Dolomitic Member of the Boñar Formation as a geological reservoir. The study covers density, porosity and permeability tests on samples obtained from the outcrop of the succession near the village of Boñar (León). According to the analysis and interpretation of the mentioned petrophysical properties, the porosity of the Dolomitic Member is within the acceptable range for CO2 geological storage, but the permeability values are far too low. This minimizes the possibilities of the Dolomitic Member –and probably of the whole Boñar Formation– to become an appropriate CO2 reservoir.[ES] La Formación Boñar (Cretácico Superior) es una sucesión carbonática que aflora al Norte de la Cuenca del Duero (España). Según datos previos, el Miembro Dolomítico de esta formación es el que muestra características petrográficas más favorables para almacenamiento geológico de CO2. El principal objetivo de este trabajo es el aporte de elementos de juicio que apoyen, clarifiquen y concreten –a un nivel de estudio preliminar– la potencialidad del Miembro Dolomítico de la Formación Boñar como roca almacén. La Formación Boñar (Cretácico Superior) es una sucesión carbonática que aflora al Norte de la Cuenca del Duero (España). Según datos previos, el Miembro Dolomítico de esta formación es el que muestra características petrográficas más favorables para almacenamiento geológico de CO2. El principal objetivo de este trabajo es el aporte de elementos de juicio que apoyen, clarifiquen y concreten –a un nivel de estudio preliminar– la potencialidad del Miembro Dolomítico de la Formación Boñar como roca almacén.S

Higher prevalence of X-ray selected AGN in intermediate age galaxies up to z~1

We analyse the stellar populations in the host galaxies of 53 X-ray selected optically dull active galactic nuclei (AGN) at 0.34<z<1.07 with ultra-deep (m=26.5) optical medium-band (R~50) photometry from the Survey for High-z Absorption Red and Dead Sources (SHARDS). The spectral resolution of SHARDS allows us to consistently measure the strength of the 4000 AA break, Dn(4000), a reliable age indicator for stellar populations. We confirm that most X-ray selected moderate-luminosity AGN (L_X<10^44 erg/s) are hosted by massive galaxies (typically M*>10^10.5 M_sun) and that the observed fraction of galaxies hosting an AGN increases with the stellar mass. A careful selection of random control samples of inactive galaxies allows us to remove the stellar mass and redshift dependencies of the AGN fraction to explore trends with several stellar age indicators. We find no significant differences in the distribution of the rest-frame U-V colour for AGN hosts and inactive galaxies, in agreement with previous results. However, we find significantly shallower 4000 AA breaks in AGN hosts, indicative of younger stellar populations. With the help of a model-independent determination of the extinction, we obtain extinction-corrected U-V colours and light-weighted average stellar ages. We find that AGN hosts have younger stellar populations and higher extinction compared to inactive galaxies with the same stellar mass and at the same redshift. We find a highly significant excess of AGN hosts with Dn(4000)~1.4 and light weighted average stellar ages of 300-500 Myr, as well as a deficit of AGN in intrinsic red galaxies. We interpret failure in recognising these trends in previous studies as a consequence of the balancing effect in observed colours of the age-extinction degeneracy.Comment: Accepted for publication in MNRAS, 12 pages, 8 figures, 1 tabl

Selection of AGN candidates in the GOODS-South Field through SPITZER/MIPS 24 μm variability

We present a study of galaxies showing mid-infrared variability in data taken in the deepest Spitzer/MIPS 24 μm surveys in the Great Observatory Origins Deep Survey South field. We divide the data set in epochs and subepochs to study the long-term (months–years) and the short-term (days) variability. We use a χ2-statistics method to select active galactic nucleus (AGN) candidates with a probability ≤1 per cent that the observed variability is due to statistical errors alone. We find 39 (1.7 per cent of the parent sample) sources that show long-term variability and 55 (2.2 per cent of the parent sample) showing short-term variability. That is, 0.03 sources × arcmin−2 for both, long-term and short-term variable sources. After removing the expected number of false positives inherent to the method, the estimated percentages are 1.0 and 1.4 per cent of the parent sample for the long term and short term, respectively. We compare our candidates with AGN selected in the X-ray and radio bands, and AGN candidates selected by their IR emission. Approximately, 50 per cent of the MIPS (Multiband Imaging Photometer for Spitzer) 24 μm variable sources would be identified as AGN with these other methods. Therefore, MIPS 24 μm variability is a new method to identify AGN candidates, possibly dust obscured and low-luminosity AGN, that might be missed by other methods. However, the contribution of the MIPS 24 μm variable identified AGN to the general AGN population is small (≤13 per cent) in GOODS-South.JG-G, AA-H, and AH-C acknowledge support from the Augusto G. Linares research programme of the Universidad de Cantabria and from the Spanish Plan Nacional through grant AYA2012-31447. PGP-G acknowledges support from MINECO grant AYA2012-31277.Peer Reviewe

Body fat in elite Spanish football referees and assistants: A 1-year follow-up study

Introduction The current literature about the body composition of elite football referees is scarce and almost non-existent. Therefore, the aim of this study was to assess and track the percentage of body fat (%BF) of elite Spanish football referees and assistant referees across an entire season.Material and methods Two hundred and twenty-eight referees and assistant referees (mean age 32.5 ± 5.1 y), refereeing in Spanish First category (La Liga), Second category, and Second-B category, took part in this study. A bioelectrical impedance analyser (TANITA BC 418-MA) was used to evaluate %BF. A total of four-time-points for 1st category referees and three for all other groups were performed throughout the season.Results Analysing by category and role, 1st category assistants had the highest %BF in all assessments (p &lt; 0.05). Small variations (around 1%) in %BF within groups were observed across the competitive season.Conclusion The %BF in elite Spanish referees remains constant, analysing by category, role and age, throughout a competitive season. All groups in this study reported healthy %BF values, between 8 and 14%, which might directly help to achieve the high standards required when refereeing and to improve the level of refereeing in the Spanish leagues

Coverage analysis of Scopus: A journal metric approach

Our aim is to compare the coverage of the Scopus database with that of Ulrich, to determine just how homogenous it is in the academic world. The variables taken into account were subject distribution, geographical distribution, distribution by publishers and the language of publication. The analysis of the coverage of a product of this nature should be done in relation to an accepted model, the optimal choice being Ulrich’s Directory, considered the international point of reference for the most comprehensive information on journals published throughout the world. The results described here allow us to draw a profile of Scopus in terms of its coverage by areas – geographic and thematic – and the significance of peer-review in its publications. Both these aspects are highly pragmatic considerations for information retrieval, the evaluation of research, and the design of policies for the use of scientific databases in scientific promotion

Greix corporal en els àrbitres i àrbitres assistents espanyols de futbol d’elit: estudi de seguiment durant un any

  Introducció: La literatura actual relativa a la composició corporal dels àrbitres de futbol d’elit és escassa i pràcticament inexistent. Per aquest motiu, l’objectiu d’aquest estudi fou avaluar i fer un seguiment del percentatge de greix corporal (%GC) dels àrbitres de futbol d’elit espanyols, i dels àrbitres auxiliars, durant tota una temporada.Material i mètodes: Participaren a l’estudi 228 àrbitres i àrbitres assistents (mitjana d’edat 32,5 ± 5,1), que arbitren a la primera divisió d’Espanya (La Liga), la segona divisió i la segona divisió B. S’utilitzà un analitzador d’impedància bioelèctrica (TANITA BC 418-MA) per avaluar el %GC. Durant la sessió s’acompliren 4 mesuraments als àrbitres de primera divisió, i 3 als de la resta de grups.Resultats: Feta l’anàlisi per categoria i funció, els assistents de primera divisió reflectiren un %GC major a totes les valoracions (p &lt; 0,05). Pel que fa al %GC, s’observaren petites variacions (del voltant de l’1%) dins els grups al llarg de la temporada de competició.Conclusió: El %GC del àrbitres espanyols d’elit roman constant, després d’haver analitzat la categoria, funció i edat, al llarg de la temporada de competició. Quant a greix corporal, tots els grups inclosos a l’estudi reportaren uns valors saludables, compresos entre el 8 i el 14%, cosa que podria contribuir directament a aconseguir els alts estàndards requerits per arbitrar, i a millorar el nivell d’arbitratge de les lligues espanyoles

Grasa corporal en los árbitros y árbitros asistentes españoles de fútbol de élite: estudio de seguimiento durante un año

  Introducción: La literatura actual relativa a la composición corporal de los árbitros de fútbol de élite es escasa y prácticamente inexistente. Por tanto, los objetivos de este estudio fueron evaluar y realizar un seguimiento del porcentaje de grasa corporal (%GC) de los árbitros de fútbol de élite españoles, y de los árbitros asistentes, a lo largo de toda la temporada.Material y métodos: En este estudio participaron 228 árbitros y árbitros auxiliares (edad media 32,5 ± 5,1 años) que arbitran en la primera división de España (La Liga), la segunda división y la segunda división B. Se utilizó un analizador de impedancia bioeléctrica (TANITA BC 418-MA) para evaluar el %GC. Durante la temporada se realizaron un total de 4 mediciones a los árbitros de primera división, y 3 al resto de grupos.Resultados: Realizando un análisis por categoría y función, los auxiliares de primera división tuvieron un mayor %GC en todas las evaluaciones (p &lt; 0,05). Se observaron pequeñas variaciones (de alrededor del 1%) en cuanto al %GC dentro de los distintos grupos a lo largo de la temporada de competición.Conclusión: El %GC en los árbitros españoles de élite permanece constante, tras analizar la categoría, función y edad, a lo largo de la temporada de competición. Todos los grupos incluidos en el estudio reportaron unos valores saludables en cuanto al %GC, comprendidos entre el 8 y el 14%, lo que podría contribuir directamente a conseguir los elevados estándares requeridos para el arbitraje, y a la mejora del nivel de arbitraje de las ligas españolas