Turbulent Fragmentation and Star Formation

We review the main results from recent numerical simulations of turbulent fragmentation and star formation. Specifically, we discuss the observed scaling relationships, the ``quiescent'' (subsonic) nature of many star-forming cores, their energy balance, their synthesized polarized dust emission, the ages of stars associated with the molecular gas from which they have formed, the mass spectra of clumps, and the density and column density probability distribution function of the gas. We then give a critical discussion on recent attempts to explain and/or predict the star formation efficiency and the stellar initial mass function from the statistical nature of turbulent fields. Finally, it appears that turbulent fragmentation alone cannot account for the final stages of fragmentation: although the turbulent velocity field is able to produce filaments, the spatial distribution of cores in such filaments is better explained in terms of gravitational fragmentation.Comment: 14 pages, 1 ps figure. Refered invited review, to appear in "Magnetic Fields and Star Formation: Theory versus Observations", eds. A.I. Gomez de Castro et al. (Kluwer), in pres

Detection of radio emission at mas scales from HESS J0632+057 with the e-EVN

HESS J0632+057 is a variable TeV gamma-ray source. The likely low energy counterparts of the source are XMMU J063259.3+054801, the B0pe-type star MWC 148, and a point-like probable non-thermal radio source

Evolución del derecho de sindicalización en el Ecuador a partir de la Constitución de 1998

This present work is a normative approach. It uses the legal historical mode to analyze the following: (1) how the right and the freedom of unionization have been treated by the legis-lator since the 1998 Political Constitution of the Republic of Ecuador. It recognized outsourc-ing and labor mediation as a contractual form worker – employer. (2) The changes have happened because of the right and the freedom that came with the promulgation 2008 Con-stitution of the Republic of Ecuador. (3) The relevance of the reforms introduced in the Labor Code with the Organic Law for Labor Justice and Recognition of Work in Home and Con-stitutional Amendments. (4) The new legal status of workers in the public sector.El presente trabajo es un acercamiento normativo que se sirve del modo histórico jurídico para analizar: (1) cómo el derecho y libertad de sindicalización ha sido tratado por parte del legislador a partir de la Constitución Política de la República del Ecuador de 1998, en la que se reconocía la tercerización y la mediación laboral como forma contractual trabajador – empleador; (2) los cambios sufridos por dicho derecho y libertad con la promulgación de la Constitución de la República del Ecuador del 2008; (3) la pertinencia de las reformas introducidas al Código del Trabajo con la Ley Orgánica para la Justicia Laboral y Reconocimiento del Trabajo en el Hogar, y de las Enmiendas Constitucionales; y (4) la nueva situación legal de los trabajadores en el sector público