{"id":1749,"date":"2017-12-18T14:35:07","date_gmt":"2017-12-18T17:35:07","guid":{"rendered":"https:\/\/iate.oac.uncor.edu\/?p=1749"},"modified":"2017-12-18T14:36:32","modified_gmt":"2017-12-18T17:36:32","slug":"the-highly-collimated-radio-jet-of-hh-80-81-structure-and-nonthermal-emission","status":"publish","type":"post","link":"https:\/\/iate.oac.uncor.edu\/en\/2017\/12\/18\/the-highly-collimated-radio-jet-of-hh-80-81-structure-and-nonthermal-emission\/","title":{"rendered":"The Highly Collimated Radio Jet of HH 80 \u2013 81: Structure and Nonthermal Emission"},"content":{"rendered":"<div><a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/1538-4357\/aa9895\/meta\"><em><strong>El radio jet altamente colimado del sistema HH 80-81: estructura y emisi\u00f3n no t\u00e9rmica<\/strong><\/em><\/a><\/div>\n<div><\/div>\n<p>&nbsp;<\/p>\n<div style=\"text-align: justify;\">Adriana Rodr\u00edguez-Kamenetzky,\u00a0Carlos Carrasco-Gonz\u00e1lez, Anabella Araudo, Gustavo E. Romero, Jos\u00e9 M. Torrelles, Luis F. Rodr\u00edguez, Guillem Anglada, Josep Mart\u00ed, Manel Perucho,\u00a0and Carlos Valotto<\/div>\n<div><\/div>\n<p>&nbsp;<\/p>\n<p><strong>Resumen<\/strong><\/p>\n<p lang=\"es-ES\" style=\"text-align: justify;\">Es bien sabido que la emisi\u00f3n en radiofrecuencias de jets protoestelares est\u00e1 generalmente dominada por la emisi\u00f3n libre-libre de electrones t\u00e9rmicos. Sin embargo, en algunos casos se ha propuesto adem\u00e1s la existencia de una componente de emisi\u00f3n no t\u00e9rmica. Esta contribuci\u00f3n adicional no t\u00e9rmica ha sido inferida mediante la detecci\u00f3n de \u00edndices espectrales negativos (el flujo disminuye con la frecuencia) en longitudes de onda centim\u00e9tricas, en algunas regiones de los radio jets. En el caso de HH 80-81, uno de los jets protoestelares m\u00e1s potentes conocidos, adem\u00e1s de \u00edndices espectrales negativos se ha detectado emisi\u00f3n linealmente polarizada, revelando as\u00ed el origen sincrotr\u00f3nico de la radiaci\u00f3n. La detecci\u00f3n de emisi\u00f3n sincrotr\u00f3n en un jet protoestelar, implica la existencia de part\u00edculas con velocidades relativistas en interacci\u00f3n con campos magn\u00e9ticos, y por lo tanto, la acci\u00f3n de un mecanismo responsable de incrementar la energ\u00eda cin\u00e9tica de dichas part\u00edculas.<\/p>\n<figure id=\"attachment_1754\" aria-describedby=\"caption-attachment-1754\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1754 size-large\" src=\"https:\/\/iate.oac.uncor.edu\/wp-content\/uploads\/2017\/12\/Fig4-1024x640.jpg\" alt=\"\" width=\"810\" height=\"506\" srcset=\"https:\/\/iate.oac.uncor.edu\/wp-content\/uploads\/2017\/12\/Fig4-1024x640.jpg 1024w, https:\/\/iate.oac.uncor.edu\/wp-content\/uploads\/2017\/12\/Fig4-300x188.jpg 300w, https:\/\/iate.oac.uncor.edu\/wp-content\/uploads\/2017\/12\/Fig4.jpg 1536w\" sizes=\"auto, (max-width: 810px) 100vw, 810px\" \/><figcaption id=\"caption-attachment-1754\" class=\"wp-caption-text\">Regi\u00f3n interna del jet HH 80-81: Im\u00e1genes del continuo en radio e \u00edndices espectrales, confeccionadas mediante la combinaci\u00f3n de datos de bandas L, S, y C (20, 13, y 6 cm, respectivamente), obtenidas con el radiointerfer\u00f3metro VLA. Beam =2.37&#8221;x1.46&#8221; (PA=4 deg). (a) Emisi\u00f3n continua en radio; los contornos representan 3, 5, 7, 9, y 11 veces el rms, 9 micro Jy\/beam. (b) Contornos de intensidad de panel (a) superpuestos al mapa de \u00edndice espectral (escala de color). Los p\u00edxeles que muestran en el mapa de \u00edndice espectral corresponden a aquellos con una relaci\u00f3n se\u00f1al a ruido S\/N &gt; 3 en la imagen del continuo en radio. (c) Ampliaci\u00f3n de la regi\u00f3n NE del jet.<\/figcaption><\/figure>\n<p lang=\"es-ES\" style=\"text-align: justify;\">En este trabajo se analizan nuevos datos radiointeferom\u00e9tricos del jet HH 80-81, de alta sensitividad y resoluci\u00f3n angular, cubriendo un amplio rango espectral (3-20 cm). Estas observaciones representan una mejora en la sensitividad y resoluci\u00f3n angular en un factor ~10 respecto a observaciones previas, lo que permite resolver la morfolog\u00eda del radio jet y estudiar los diferentes mecanismos de emisi\u00f3n dominante en distintas regiones. Se concluye que la emisi\u00f3n sincrotr\u00f3n en este jet proviene de una componente extendida detectada a bajas frecuencias, y de las regiones de terminaci\u00f3n del jet, donde tienen lugar fuertes choques con el medio ambiente, capaces de acelerar part\u00edculas a energ\u00edas relativistas de manera eficiente. Los resultados hallados proveen evidencias robustas de que algunos jets protoestelares son mucho m\u00e1s complejos de lo que se pensaba, y difieren claramente de la simple estructura t\u00e9rmica com\u00fanmente asociada a ellos. M\u00e1s a\u00fan, las similitudes halladas en el caso de HH 80-81 con jets relativistas , lleva a pensar en la posible existencia de un mecanismo universal responsable de la colimaci\u00f3n y aceleraci\u00f3n de jets en distintas escalas.<\/p>\n<p lang=\"es-ES\"><em><strong>Abstract<\/strong><\/em><\/p>\n<p lang=\"es-ES\" style=\"text-align: justify;\">Radio emission from protostellar jets is usually dominated by free free emission from thermal electrons. However, in some cases, it has been proposed that nonthermal emission could also be present. This additional contribution from nonthermal emission has been inferred through negative spectral indices at centimeter wavelengths in some regions of the radio jets. In the case of HH 80\u201381, one of the most powerful protostellar jets known, linearly polarized emission has also been detected, revealing that the nonthermal emission is of synchrotron nature from a population of relativistic particles in the jet. This result implies that an acceleration mechanism should be taking place in some parts of the jet. Here, we present new high sensitivity and high angular resolution radio observations at several wavelengths (in the 3-20 cm) range of the HH 80\u201381 radio jet. These new observations represent an improvement in sensitivity and angular resolution by a factor of \u223c10 with respect to previous observations. This allows us to resolve the morphology of the radio jet and to study the different emission mechanisms involved through spectral index maps. We conclude that synchrotron emission in this jet arises from an extended component detected at low frequencies and from the termination points of the jet, where strong shocks against the ambient medium can produce efficient particle acceleration.<\/p>","protected":false},"excerpt":{"rendered":"<p>El radio jet altamente colimado del sistema HH 80-81: estructura y emisi\u00f3n no t\u00e9rmica &nbsp; Adriana Rodr\u00edguez-Kamenetzky,\u00a0Carlos Carrasco-Gonz\u00e1lez, Anabella Araudo, Gustavo E. Romero, Jos\u00e9 M. Torrelles, Luis F. Rodr\u00edguez, Guillem Anglada, Josep Mart\u00ed, Manel Perucho,\u00a0and Carlos Valotto &nbsp; Resumen Es bien sabido que la emisi\u00f3n en radiofrecuencias de jets protoestelares&hellip;<\/p>","protected":false},"author":1,"featured_media":517,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1749","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\/1749","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=1749"}],"version-history":[{"count":0,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts\/1749\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/media\/517"}],"wp:attachment":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/media?parent=1749"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/categories?post=1749"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/tags?post=1749"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}