Molecules in Bipolar Outflows

Bipolar outflows constitute some of the best laboratories to study shock chemistry in the interstellar medium. A number of molecular species have their abundance enhanced by several orders of magnitude in the outflow gas, likely as a combined result of dust mantle disruption and high temperature gas chemistry, and therefore become sensitive indicators of the physical changes taking place in the shock. Identifying these species and understanding their chemical behavior is therefore of high interest both to chemical studies and to our understanding of the star-formation process. Here we review some of the recent progress in the study of the molecular composition of bipolar outflows, with emphasis in the tracers most relevant for shock chemistry. As we discuss, there has been rapid progress both in characterizing the molecular composition of certain outflows as well as in modeling the chemical processes likely involved. However, a number of limitations still affect our understanding of outflow chemistry. These include a very limited statistical approach in the observations and a dependence of the models on plane-parallel shocks, which cannot reproduce the observed wing morphology of the lines. We finish our contribution by discussing the chemistry of the so-called extremely high velocity component, which seems different from the rest of the outflow and may originate in the wind from the very vicinity of the protostar.Comment: 15 pages, 7 figures. Contribution to the IAU Conference "The Molecular Universe" held in Toledo in June 201

IRAM-PdBI Observations of Binary Protostars I: The Hierarchical System SVS13 in NGC1333

We present millimeter interferometric observations of the young stellar object SVS13 in NCG1333 in the N2H+(1-0) line and at 1.4 and 3mm dust continuum, using the IRAM Plateau de Bure interferometer. The results are complemented by infrared data from the Spitzer Space Telescope. The millimeter dust continuum images resolve four sources (A, B, C, and VLA3) in SVS13. With the dust continuum images, we derive gas masses of 0.2-1.1 M_sun for the sources. N2H+(1-0) line emission is detected and spatially associated with the dust continuum sources B and VLA3. The observed mean line width is ~0.48 km/s and the estimated virial mass is ~0.7 M_sun. By simultaneously fitting the seven hyperfine line components of N2H+, we derive the velocity field and find a symmetric velocity gradient of about 28 km/s/pc across sources B and VLA3, which could be explained by core rotation. The velocity field suggests that sources B and VLA3 are forming a physically bound protobinary system embedded in a common N2H+ core. Spitzer images show mid-infrared emission from sources A and C, which is spatially associated with the mm dust continuum emission. No infrared emission is detected from source B, implying that the source is deeply embedded. Based on the morphologies and velocity structure, we propose a hierarchical fragmentation picture for SVS13 where the three sources (A, B, and C) were formed by initial fragmentation of a filamentary prestellar core, while the protobinary system (sources B and VLA3) was formed by rotational fragmentation of a single collapsing sub-core.Comment: 26 pages, 9 figures, accepted by Ap

Sophus Lie

Artículo sobre el centenario de Marius Sophus LieFac. de Ciencias MatemáticasTRUEpu

Filosofía del amor en «El Cantar de los Cantares»

Conferencia pronunciada en el Salón de Actos de la Comunidad Israelita de Madrid, el 26 de marzo de 1974, por el Prof. Angel Rodríguez Bachiller, ilustre filósofo y sugestivo conferenciante, el cual, sobre el cañamazo de una de las numerosas teorías excogitadas en la exégesis del libro, aun a sabiendas de que quizá no es hoy la más seguida, ha bordado con !lingular maestría y excelente argumentación un estudio denso y ameno. El lector que desee alguna información sobre exégesis externa del Cantar, entre la inmensa bibliografía en torno a este diminuto libro puede ver, p. e., revista Sefarad 1 (1941), pp. 364-366; el Manual de Historia de la Literatura Hebrea por David Gonzalo Maeso, I parte, cap. XII, pp. 143-150; o alguna de las numerosas Introducciones a la Sda. Escritura, Diccionarios bíblicos o grandes Enciclopedias judaicas. Advertimos asimismo que ateniéndose al título mismo del libro en la Biblia y al uso tradicional, emplea el conferenciante la expresión "canto de Salomón". (D.G.M.

David Hilbert

Nota necrológicaFac. de Ciencias MatemáticasTRUEpu

Germay (R. H.J.): intégration par approximations successives des équations aux derivées partielles (Reseña)

La reseña corresponde a un artículo publicado en: Extrait des Mémories de la Soc. Royale des Sciences de Liège, 3ª serie, tomo XII, 1924. Fasc. de 42 págs.Fac. de Ciencias MatemáticasTRUEpu

Curso de topología

Crónica. Real Academia de Ciencias Exactas, Físicas y Naturales. Fundación del Conde de Cartagena. Cátedra de Matemática (curso de topología). Conferencias del Prof. T. R. Bachiller.Fac. de Ciencias MatemáticasTRUEpu

Conjuntos cerrados no densos

Glosario matemático. Discusión sobre: Hobson (E. H.): The theory of junctions of a real variable and the theory of Fourier’s series. Cambridge University Press. Edición de 1907 y tomo 1.* de la de 1921.Fac. de Ciencias MatemáticasTRUEpu

Conferencias del prof. Dr. Terradas

Fac. de Ciencias MatemáticasTRUEpu

Fueter (Dr. R.): Vorlesungen líber die singulüren nioduln and die Komplexe Multipllkatlon der elliptlschen Funktionen.

Reseña del artículo: Fueter (Dr. R.): Vorlesungen líber die singulüren moduln and die Komplexe Multipllkatlon der elliptlschen Funktionen.—Erster Teil., VI, 142 S. mit. 16 Figuren im Text. B. G. Teubner. Leipzig-Berlin, 1924.Fac. de Ciencias MatemáticasTRUEpu