Search results for "Jet"
showing 10 items of 4711 documents
X-ray emission in protostellar jets: comparison between model predictions and observations
2007
Herbig-Haro objects: model prediction and comparison with X-ray and optical observations
2007
X-ray emission from fast moving shocks in the protostellar jet HH 154: a binding diagnostic of the emission mechanism
2004
We propose to determine the proper motion of the X-ray source associated with HH 154, the only known protostellar jet in which the X-ray emission mechanism can be studied in detail. Our numerical simulations indicate that the X-rays are produced in a fast-moving (500 km/s) post-shock region, and our HST observations show high proper motion shocked material moving at similar speed. Detection (or lack of) of proper motion of the X-ray source will strongly confirm (or falsify) our model, and constitute the basis for a general theory of X-ray emission in protostellar jets. Understanding and modeling the emission mechanism is key to assess the lifetime of the X-ray emission and thus the influenc…
Budjetointi hyvinvointivaltiossa miten kakku jaetaan?
2009
Diseño de un sistema de indicadores, amparados en los 17 Objetivos del Desarrollo Sostenible (ONU), para la creación de un indicador sintético en des…
2020
Las transformaciones sociales, políticas y económicas de las tres últimas décadas, enmarcan el crecimiento y el desarrollo de la actividad turística. A partir de la década de los 50, los destinos turísticos de sol y playa empezaron a presentar importante destaque en el ámbito turístico internacional, con énfasis en la costa mediterránea española y en la costa algarvéa portuguesa, transformándose en un factor decisivo en el desarrollo de las economías (Meethan, 2001) en la península Ibérica. El crecimiento y el desarrollo de la actividad turística trajo importantes transformaciones y oportunidades, tanto dentro como fuera del sector (Jafari, 1994), transformando el turismo en una nueva e imp…
Sub-milliarcsecond imaging of a bright flare and ejection event in the extragalactic jet 3C 111
2020
Context. Flares in radio-loud active galactic nuclei are thought to be associated with the injection of fresh plasma into the compact jet base. Such flares are usually strongest and appear earlier at shorter radio wavelengths. Hence, very long baseline interferometry (VLBI) at millimeter(mm)-wavelengths is the best-suited technique for studying the earliest structural changes of compact jets associated with emission flares. Aims. We study the morphological changes of the parsec-scale jet in the nearby (z = 0.049) γ-ray bright radio galaxy 3C 111 following a flare that developed into a major radio outburst in 2007. Methods. We analyse three successive observations of 3C 111 at 86 GHz with th…
On the location of the supermassive black hole in CTA102
2015
Relativistic jets in active galactic nuclei represent one of the most powerful phenomena in the Universe. They form in the surroundings of the supermassive black holes as a by-product of accretion onto the central black hole in active galaxies. The flow in the jets propagates at velocities close to the speed of light. The distance between the first part of the jet that is visible in radio images (core) and the black hole is still a matter of debate. Only very-long-baseline interferometry observations resolve the innermost compact regions of the radio jet. Those can access the jet base, and combining data at different wavelenghts, address the physical parameters of the outflow from its emiss…
Noyen-sur-Seine (Seine-et-Marne), Nord du Bois du Chêne, Caille-Boton, La Chapotte et Le Haut du Faÿ : phase 2 : rapport de diagnostic
2011
Ce diagnostic se situe sur la commune de Noyen-sur-Seine, sur une carrière d'exploitation de granulats. Il a permis la mise au jour de structures du Campaniforme au Nord-Est du site, de l'étape moyenne du Bronze final (culture Rhin-Suisse-France orientale) et du Hallsatt D2/3-La Tène A. Les structures de la culture RSFO sont en continuité avec celles mises au jour lors du diagnostic sur la parcelle adjacente (Samzun, 2009), et qui ont donné lieu à une fouille durant l'été 2010 (Nallier, à paraître). Les structures du Hallstatt sont apparues au Nord-ouest du décapage.
Jaulnes (Seine-et-Marne), "Les Graviers" : rapport de diagnostic
2010
Ce diagnostic a permis la mise au jour de structures du Néolithique récent/final dont une sépulture, ainsi que des monuments funéraires protohistoriques et des structures gallo-romaines.
Molecular Confinement in Femtoliter scale aqueous Compartments
2017
Molecular confinement is known to lead to acceleration of molecular dynamics along with surface interaction. Nature employs confinement in molecularly crowded, heterogeneous and, specialized femtoliter (fL) compartments inside living cells for spontaneously achieving higher reaction efficiency and spatial-programming of composite, multi-step biochemical processes. We here show the facile production of aqueous fL droplets for studying molecular confinement on a biochip. We prepare fL aqueous droplets in oil drops on solid substrates by a “field-free”- no external electric fields and electrolytes - piezoelectric inkjet printing in which a novel actuating waveform is employed by picoliter size…