Publication: Procesamiento de la señal ultravioleta para el estudio del medio interestelar (de GALEX a WSO-UV)
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2019-05-06
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Universidad Complutense de Madrid
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Abstract
El propósito del trabajo aquí presentado es aprovechar al máximo las evidencias que el Medio Interestelar deja en las imágenes ultravioleta. Se ha desarrollado en el marco del proyecto WSO-UV y se han utilizado las imágenes de la misión GALEX. En el Capítulo 4 se presentan dos métodos. El primero (Pair Method en imágenes) está en la base de nuestro estudio y permite tanto realzar la radiación reflejada por las nubes como una estimación aproximada de la Atenuación, medida en magnitud aparente, en los casos donde la nube absorbe la luz. El segundo método se ha presentado públicamente (Tel Aviv, Israel 2017) con el nombre del factor BSVR. Este factor mide el peso que ocupa la información sobre el Medio Interestelar en una imagen determinada, proporcionando al astrónomo un índice del interés para su estudio. Se ha calculado este factor para más de ochenta mil imágenes de GALEX en el rango de ultravioleta lejano y al cotejar los resultados con algunos catálogos recurrentes de la literatura se han constatado varias evidencias detalladas en el último capítulo. Por ejemplo que la contribución del fondo ultravioleta difuso es más importante cuanto más cerca observamos las nubes. El uso en imágenes de las ecuaciones del Pair Method abre las puertas a multitud de trabajos en áreas específicas, permite visualizar las correlaciones reseñadas en la bibliografía entre el ultravioleta y el infrarrojo (a 100μm) y da una dimensión numerable a las evidencias del Medio Interestelar recibidas en ultravioleta. Además el presente trabajo ha hecho públicos tanto los resultados generales como el acceso a las herramientas desarrolladas y otros resultados cualitativos.
The purpose of the work presented here is to exploit evidences of Interstellar Mediums in the providedultraviolet images. It was developed under theWSO-UV project and the ultraviolet images have been usedfrom the Galaxy Evolution Explorer (GALEX), an orbiting space telescope that was designed to observethe universe in ultraviolet wavelengths. Two methods are used to authenticate these images: The PairMethod and another known as, Background-Scale Variability Rating (BSVR). The pair method is in thebase of our studies and allows us to enhance the scattering light as well as compute an estimated approachof Attenuation –measured in apparent magnitudes– when the cloud absorbs the light. The second method,BSVR has been publicly presented in Tel Aviv (Israel) in 2017; this process measures a particular imagesince the amount of information involving the Interstellar Medium, provides the astronomer with an indexof the interset of the image for the Interstellar Medium studies. More than eighty thousand ultravioletimages from GALEX have been processed and rated with this method. The last chapter details someconclusions after collating the results with the most recurrent catalogs in the literature. For example, thediffused ultraviolet sky background contribution is more important when it is closer to the clouds thatare observed. The Pair Method opens the gate to tons of information that are present in specific areas ofthe sky. It allows visual correlations between ultraviolet signals and infrareds (at 100/mum), and it givesa numerable dimension of the evidences from the Interstellar Medium received in the ultraviolet band.Both the overall results and the access to the tools developed and other qualitative results of the presentwork has been made public.
The purpose of the work presented here is to exploit evidences of Interstellar Mediums in the providedultraviolet images. It was developed under theWSO-UV project and the ultraviolet images have been usedfrom the Galaxy Evolution Explorer (GALEX), an orbiting space telescope that was designed to observethe universe in ultraviolet wavelengths. Two methods are used to authenticate these images: The PairMethod and another known as, Background-Scale Variability Rating (BSVR). The pair method is in thebase of our studies and allows us to enhance the scattering light as well as compute an estimated approachof Attenuation –measured in apparent magnitudes– when the cloud absorbs the light. The second method,BSVR has been publicly presented in Tel Aviv (Israel) in 2017; this process measures a particular imagesince the amount of information involving the Interstellar Medium, provides the astronomer with an indexof the interset of the image for the Interstellar Medium studies. More than eighty thousand ultravioletimages from GALEX have been processed and rated with this method. The last chapter details someconclusions after collating the results with the most recurrent catalogs in the literature. For example, thediffused ultraviolet sky background contribution is more important when it is closer to the clouds thatare observed. The Pair Method opens the gate to tons of information that are present in specific areas ofthe sky. It allows visual correlations between ultraviolet signals and infrareds (at 100/mum), and it givesa numerable dimension of the evidences from the Interstellar Medium received in the ultraviolet band.Both the overall results and the access to the tools developed and other qualitative results of the presentwork has been made public.
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Tesis de la Universidad Complutense de Madrid, Facultad de Ciencias Físicas, leída el 20-12-2018