{"id":15797,"date":"2017-05-31T08:57:36","date_gmt":"2017-05-31T12:57:36","guid":{"rendered":"http:\/\/www.astrofisicamas.cl\/?p=15797"},"modified":"2023-08-07T21:07:36","modified_gmt":"2023-08-07T21:07:36","slug":"whiting1-un-cumulo-globular-asimilado-por-la-via-lactea","status":"publish","type":"post","link":"https:\/\/astrofisicamas.cl\/en\/whiting1-un-cumulo-globular-asimilado-por-la-via-lactea\/","title":{"rendered":"Nuestra investigaci\u00f3n: Whiting1, un c\u00famulo globular asimilado por la V\u00eda L\u00e1ctea"},"content":{"rendered":"<div class=\"mceTemp\"><\/div>\n<p>[:es]<\/p>\n<h4><strong><em>Por Julio Carballo &#8211; Bello, investigador postdoctoral MAS y del Instituto de Astrof\u00edsica UC\u00a0<\/em><\/strong><!--more--><\/h4>\n<p>\u00bfC\u00f3mo se form\u00f3 el universo? \u00bfY las galaxias? \u00bfQu\u00e9 tienen en com\u00fan el proceso que dio lugar a la formaci\u00f3n de la V\u00eda L\u00e1ctea y el que origin\u00f3 los otros billones de galaxias descubiertas hasta la fecha? Estas preguntas se enmarcan dentro de la rama de la astrof\u00edsica que llamamos <strong>Cosmolog\u00eda<\/strong>. Intentamos responderlas ayud\u00e1ndonos de los fen\u00f3menos que somos capaces de observar con nuestros instrumentos.<\/p>\n<p><strong>Uno de los retos principales que enfrentan los investigadores dedicados a esta disciplina es tratar de explicar, en una \u00fanica teor\u00eda, la formaci\u00f3n y evoluci\u00f3n desde las galaxias m\u00e1s alejadas que conocemos hasta nuestra propia casa, la V\u00eda L\u00e1ctea.<\/strong> Las simulaciones de computador m\u00e1s potentes, que incorporan toda la f\u00edsica que estimamos relevante, demuestran que galaxias complejas como la que habitamos se formaron mediante la fusi\u00f3n o asimilaci\u00f3n de otras galaxias mucho m\u00e1s peque\u00f1as, que poco a poco fueron devoradas por la naciente V\u00eda L\u00e1ctea. En este proceso de canibalismo gal\u00e1ctico, las galaxias menos masivas acabaron siendo destruidas y sus componentes pasaron a formar parte de nuestra galaxia.<\/p>\n<p>Como en todo crimen, los investigadores esperan encontrar alg\u00fan tipo de pista que les lleve a comprender lo que ocurri\u00f3 hace miles de millones de a\u00f1os. Las simulaciones predicen que las galaxias que han sido v\u00edctimas del apetito de la V\u00eda L\u00e1ctea deber\u00edan dejar rastros de estrellas denominados corrientes de marea. Y, en efecto, gracias a cartografiados de grandes \u00e1reas del cielo en las \u00faltimas dos d\u00e9cadas, los arque\u00f3logos gal\u00e1cticos han podido demostrar que esas trazas de estrellas existen. Es m\u00e1s, si somos capaces de decodificar correctamente la informaci\u00f3n que contienen esas corrientes de marea, seremos capaces de averiguar d\u00f3nde y cu\u00e1ndo se produjeron, la composici\u00f3n qu\u00edmica de sus galaxias progenitoras y sus \u00f3rbitas.<\/p>\n<p>Adem\u00e1s de contribuir con estrellas individuales, las galaxias enanas asimiladas habr\u00edan aportado sus c\u00famulos globulares, grupos compuestos por entre cientos de miles y millones de estrellas concentradas en un volumen muy peque\u00f1o.\u00a0 Sospechamos que, de los alrededor de 150 c\u00famulos globulares que hay en la V\u00eda L\u00e1ctea, un n\u00famero a\u00fan indeterminado nacieron en otras galaxias y luego fueron acrecidos por la nuestra. <strong>Recientemente, hemos intentado confirmar la hip\u00f3tesis de que Whiting1, un c\u00famulo peque\u00f1o y poco estudiado, se form\u00f3 en la galaxia enana de Sagitario y posteriormente fue asimilado por la V\u00eda L\u00e1ctea. Para ello, observamos con VLT (siglas en ingl\u00e9s para \u201cTelescopio Muy Grande\u201d) una muestra de 100 estrellas en los alrededores del c\u00famulo y derivamos su velocidad respecto al Sol utilizando sus espectros estelares.<\/strong><\/p>\n<p>Nuestros resultados mostraron que una fracci\u00f3n importante de las estrellas observadas ten\u00eda velocidades incompatibles con su posici\u00f3n en la V\u00eda L\u00e1ctea, es decir, estas estrellas podr\u00edan pertenecer a una galaxia acrecida. Como hemos dicho, nuestra principal sospecha era que este c\u00famulo se form\u00f3 en Sagitario y efectivamente, cuando comparamos las velocidades medidas por nosotros con las predichas por los modelos para esa galaxia enana, demostramos que dichas estrellas pertenecen a la corriente de marea de Sagitario y que tienen una velocidad id\u00e9ntica a la del c\u00famulo Whiting1. De esta forma, confirmamos que el c\u00famulo globular se encuentra a la misma distancia y tiene la misma velocidad que los restos de su galaxia progenitora, la galaxia enana de Sagitario.<\/p>\n<p>Foto principal: Recreaci\u00f3n art\u00edstica de la corriente de marea generada por la asimilaci\u00f3n de Sagitario por la V\u00eda L\u00e1ctea. En la imagen se indica la posici\u00f3n aproximada del Sol. Cr\u00e9ditos: <em>NASA\/JPL-Caltech\/R. Hurt (SSC)<\/em><\/p>\n<figure id=\"attachment_15800\" aria-describedby=\"caption-attachment-15800\" style=\"width: 300px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/05\/2017_05_31_JCarballo_1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15800 size-medium\" src=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/05\/2017_05_31_JCarballo_1-300x296.jpg\" alt=\"\" width=\"300\" height=\"296\" \/><\/a><figcaption id=\"caption-attachment-15800\" class=\"wp-caption-text\">Posici\u00f3n de las estrellas observadas (s\u00edmbolos de color) alrededor del c\u00famulo globular Whiting1.<\/figcaption><\/figure>\n<figure id=\"attachment_15798\" aria-describedby=\"caption-attachment-15798\" style=\"width: 300px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/05\/2017_05_31_JCarballo_2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15798 size-medium\" src=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/05\/2017_05_31_JCarballo_2-300x293.jpg\" alt=\"\" width=\"300\" height=\"293\" \/><\/a><figcaption id=\"caption-attachment-15798\" class=\"wp-caption-text\">Histograma mostrando el n\u00famero de estrellas observadas con una determinada velocidad respecto al sol (l\u00ednea negra). Cuando comparamos con las velocidades predichas para la corriente de Sagitario (histogramas amarillo y azul), vemos que dos de las tres componentes detectadas tienen la misma velocidad. La l\u00ednea vertical indica la velocidad de Whiting1.<\/figcaption><\/figure>\n<p>[:]<\/p>","protected":false},"excerpt":{"rendered":"<p>[:es] Por Julio Carballo &#8211; Bello, investigador postdoctoral MAS y del Instituto de Astrof\u00edsica UC\u00a0<\/p>","protected":false},"author":3,"featured_media":29283,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_eb_attr":"","footnotes":""},"categories":[59],"tags":[],"class_list":["post-15797","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-columnas"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nuestra investigaci\u00f3n: Whiting1, un c\u00famulo globular asimilado por la V\u00eda L\u00e1ctea - Instituto Milenio de Astrof\u00edsica MAS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/astrofisicamas.cl\/en\/whiting1-un-cumulo-globular-asimilado-por-la-via-lactea\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nuestra investigaci\u00f3n: Whiting1, un c\u00famulo globular asimilado por la V\u00eda L\u00e1ctea - 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