Star formation in the warped outer pseudoring of the spiral galaxy NGC 3642

NGC 3642 was classified as a spiral galaxy with three rings and no bar. We have performed an HI and optical study of this nearly face-on galaxy. We find that the nuclear ring might in fact be part of an inner one-armed spiral, that could be driving nuclear accretion and feeding the central activity in the inner kpc. The inner ring is faint, and the outer ring is a rather ill-defined pseudoring. Furthermore, the size ratio of the rings is such that they cannot be due to a single pattern speed linking them together. The outer pseudoring is peculiar, since it lies in the faint outer parts of the disk, where star formation is still going on at 1.4 times the optical radius. Higher HI column densities are associated with these regions and the atomic gas layer is warped. These perturbations affect only the outer disk, since the kinematics within the main body conforms well to an ordinary differentially rotating disk. We propose here that both nuclear activity and star formation in the warped outer parts might be linked to the fact that NGC 3642 is located in a rich environment, where its close neighbors show clear signs of merging. Our suggestion is that NGC 3642 has captured recently a low-mass, gas-rich dwarf, and star formation was triggered in this infalling external gas that produced also a pronounced warp in the gaseous disk.Comment: Accepted for publication in A&A. Full resolution version available at http://www.iaa.es/~lourdes/3642/H3551.tar.g

Revised positions for the CIG galaxies

We present revised positions for the 1051 galaxies belonging to the Karachentseva Catalog of Isolated Galaxies (CIG). New positions were calculated by applying SExtractor to the Digitized Sky Survey CIG fields with a spatial resolution of 1.2''. We visually checked the results and for 118 galaxies had to recompute the assigned positions due to complex morphologies (e.g. distorted isophotes, undefined nuclei, knotty galaxies) or the presence of bright stars. We found differences between older and newer positions of up to 38'' with a mean value of 2.96'' relative to SIMBAD and up to 38'' and 2.42'' respectively relative to UZC. Based on star positions from the APM catalog we determined that the DSS astrometry of five CIG fields has a mean offset in (RA, Dec) of (-0.90'',0.93'') with a dispersion of 0.4''. These results have been confirmed using the 2MASS All-Sky Catalog of Point Sources. The intrinsic errors of our method combined with the astrometric ones are of the order of 0.5''.Comment: 6 pages, 7 figures. Accepted for publication in A&A. The data can be downloaded at http://www.iaa.csic.es/AMIGA.htm

Securitization: Open research agendas for the study of security

En poco más de una década y media de recorrido, la teoría de la securitización impulsada por la Escuela de Copenhague se ha asentado en los Estudios Internacionales de Seguridad y las Relaciones Internacionales en general, dando pie a un intenso debate con importantes implicaciones ontológicas y epistemológicas, al mismo tiempo que ha abierto nuevas agendas de investigación. Tras exponer en qué contexto emerge esta teoría, este trabajo pretende en un primer momento revisar los postulados originales del enfoque de la securitización y, a la luz de las distintas críticas que han aflorado en estos años, revisar las agendas de investigación actuales y sintetizarlas en torno a cinco ejes, con vistas a dinamizar la discusión en torno a este enfoque teórico en la comunidad académica, especialmente en la hispanoparlanteIn little more than a decade, the securitization theory initially pushed forward by the Copenhagen School has secured a place within International Security Studies and in International Relations at large. Over the years, ontological and epistemological questions have been object of in-depth discussion in our field of study, as a consequence of which new research agendas have arisen. The paper begins by reviewing the context in which securitization theory comes to the fore, thereby paving the way for the presentation of its original framework of analysis. Bearing in mind the various critiques and revisions that have dealt with the theory, this paper proposes a research agenda organized around five key issues. The goal ultimately is to put new energy into debates around this theoretical framework, which might be of particular interest for the Spanish-speaking academic communit

[Documentos acreditativos de propiedad de una casa en la Parroquia de S. Esteban y 10 hanegadas de tierra en Benicalap, vendidas a Juan Verdes Montenegro] [Manuscrito].]

Ms. e imp.Texto en castellano, valenciano y latín.admtvo.0

Relaciones internacionales, seguridad y teorías críticas en España

Reseñas de: Pérez de Armiño, Karlos y Mendía Azkue, Irantzu (eds.), Seguridad Humana. Aportes Críticos al debate Teórico y Político, Tecnos-Hegoa UPV, Madrid, 2013, ps. 318 y Del Arenal, Celestino y Sanahuja, José Antonio (coords.), Teorías de las Relaciones Internacionales, Tecnos, Madrid, 2015, ps. 37

Recovering isolated galaxies from large scale surveys: problems and strategies

The large survey programs being performed nowadays, being the SDSS their flagship, provide us with morphological parameters which allow for extraction of large galaxy samples. We will analyze the methodology for obtaining an AMIGA-like catalogue of isolated galaxies from the SDSS DR5 photometric catalogue of galaxy objects, together with the roadblocks found in the process, and suggested workarounds.Comment: 4 pages, 2 figures, to appear in the Proceedings of the International Conference CIG09: Galaxies in Isolation, held in May 19th in Granada, Spai