Keble Road, Oxford OX1 3RH, UK<\/a>
\n5 Instituto de Radioastronom\u00eda y Astrof\u00edsica, Universidad Nacional Aut\u00f3noma de M\u00e9xico, Apdo. Postal 3-72, 58090, Morelia, Michoac\u00e1n, M\u00e9xico<\/p>\n![\"\"](\"https:\/\/iate.oac.uncor.edu\/wp-content\/uploads\/2017\/09\/HH-1024x334.jpg\")
<\/p>\n
ABSTRACT<\/strong>
\nSynchrotron radiation is commonly observed in connection with shocks of different velocities, ranging from relativistic shocks associated with active galactic nuclei, gamma-ray bursts, or microquasars, to weakly or non- relativistic flows such as those observed in supernova remnants. Recent observations of synchrotron emission in protostellar jets are important not only because they extend the range over which the acceleration process works, but also because they allow us to determine the jet and\/or interstellar magnetic field structure, thus giving insights into the jet ejection and collimation mechanisms. In this paper, we compute for the first time polarized (synchrotron) and non-polarized (thermal X-ray) synthetic emission maps from axisymmetrical simulations of magnetized protostellar jets. We consider models with different jet velocities and variability, as well as a toroidal or helical magnetic field. Our simulations show that variable, low-density jets with velocities of \u223c1000 km\/s and \u223c10 times lighter than the environment can produce internal knots with significant synchrotron emission and thermal X-rays in the shocked region of the leading bow shock moving in a dense medium. While models with a purely toroidal magnetic field show a very large degree of polarization, models with a helical magnetic field show lower values and a decrease of the degree of polarization, in agreement with observations of protostellar jets.<\/p>\nRESUMEN<\/strong>
\nLa radiaci\u00f3n sincrotr\u00f3n se observa com\u00fanmente en choques que van desde choques relativistas asociados con \u00a0n\u00facleos gal\u00e1cticos activos, rayos gamma o microquasares, hasta flujos d\u00e9biles o no-relativistas como los observados en los restos de supernova. <\/span><\/span>Las recientes observaciones de radiacio\u0301n sincrotro\u0301n en jets protoestelares son importantes no solo porque ampl\u00edan el rango sobre el cual funciona el proceso de aceleraci\u00f3n<\/span><\/span>, sino porque nos permiten determinar la estructura del jet y\/o del campo magne\u0301tico interestelar, dando con ello una previsio\u0301n en los mecanismos de eyeccio\u0301n del jet y de la colimacio\u0301n del mismo. En este trabajo, se muestran los resultados obtenidos a partir del ana\u0301lisis de mapas sinte\u0301ticos de emisio\u0301n polarizada (sincrotro\u0301n) y no polarizada (rayos X t\u00e9rmicos) construidos con \u00a0datos de simulaciones de jets protoestelares axisime\u0301tricos magnetizados. Se consideraron modelos con diferentes \u00a0velocidades del jet y variabilidad, con campos magne\u0301ticos tanto toroidales como helicoidales. Nuestras simulaciones mostraron que jets de baja densidad, con velocidades de orden de 1000 km\/s y aproximadamente 10 veces menos densos que el medio ambiente, pueden producir nudos internos con significativa radiacio\u0301n sincrotro\u0301n y rayos X t\u00e9rmicos en la regi\u00f3n del choque <\/span>delantero que se mueve en un medio denso<\/span><\/span><\/span>. Mientras que los modelos con un campo magne\u0301tico puramente toroidal muestran un alto grado de polarizacio\u0301n, los modelos con campo magne\u0301tico helicoidal muestran un decrecimiento de estos valores, de acuerdo con las observaciones de jets protoestelares.<\/p>","protected":false},"excerpt":{"rendered":"A STUDY OF RADIO POLARIZATION IN PROTOSTELLAR JETS Astrophysical Journal, 816 , pp. 64, 2016 Mariana C\u00e9cere (1,2), Pablo F. Vel\u00e1zquez (3), Anabella T. Araudo (4), Fabio De Colle (3), Alejandro Esquivel (3), Carlos Carrasco-Gonz\u00e1lez (5), Luis F. Rodr\u00edguez (5) 1 Instituto de Astronom\u00eda Te\u00f3rica y Experimental, Universidad Nacional de…<\/p>","protected":false},"author":1,"featured_media":567,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novedades"],"_links":{"self":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts\/1645","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/comments?post=1645"}],"version-history":[{"count":0,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts\/1645\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/media\/567"}],"wp:attachment":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/media?parent=1645"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/categories?post=1645"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/tags?post=1645"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}