QSO composición espectral y espectro medio de cuásares en SDSS
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Revista Boliviana de Física
Abstract
Empleando un total de 750414 cuásares del catálogo: Data Reléase 16 Quasar (DR16Q) del proyecto Sloan Digital Sky Survey (SDSS), se compuso un espectro medio para cuásares con corrimiento al rojo cosmológico (z, redshift) entre 0.01 y 5.3. La muestra total se dividió en 8 intervalos de z y se obtuvo una mejor relación señal/ ruido (S/N) que estudios similares anteriores. El proceso de Composición Espectral es una técnica esencial para el análisis de cuásares y una de las de mayor precisión en la estimación de sus propiedades físicas como el ancho equivalente (EW, equivalent width), forma de lineas de emisión, luminosidad (L), masas de agujeros negros (MBH, black hole mass) y precisar relaciones entre propiedades físicas como el efecto Baldwin (BE, Baldwin effect). A la fecha, es el espectro medio compuesto con la mayor cantidad de cuásares, alcanzando una máxima relación S/N de 1418 por pixel a 2 367Á. Se ha logrado identificar el efecto de Gunn-Peterson en longitudes de onda menor a Ly y también se ha conseguido una imagen espectral para longitudes de onda menores al limite de Lyman (912Á) hasta 516Á
Using a total of 750414 quasars from the Sloan Digital Sky Survey Data Reléase 16 quasar catalog (DR16Q), a mean spectrum for quasars with cosmological redshift (z, redshift) between 0.01 and 5.3 was composed. The total sample was divided into 8 z intervals which provided a better signal-to-noise ratio (S/N) than obtained in previous similar studies. The Spectral Composition process is an essential technique for the analysis of quasars and one of the most accurate in the estimation of their physical properties, such as, equivalent width (EW), emission line shape, luminosity (L), black hole mass (MBH), as well as, to determine relationships between physical properties such as the Baldwin effect (BE). To date, it is the mean composite spectrum with the largest number of quasars, reaching a máximum S/N ratio of 1418 per pixel at 2 367Á. It has been possible to identify the Gunn-Peterson effect at wavelengths shorter than Ly and a spectral image has also been obtained for wavelengths shorter than the Lyman limit (912Á) up to 516Á
Using a total of 750414 quasars from the Sloan Digital Sky Survey Data Reléase 16 quasar catalog (DR16Q), a mean spectrum for quasars with cosmological redshift (z, redshift) between 0.01 and 5.3 was composed. The total sample was divided into 8 z intervals which provided a better signal-to-noise ratio (S/N) than obtained in previous similar studies. The Spectral Composition process is an essential technique for the analysis of quasars and one of the most accurate in the estimation of their physical properties, such as, equivalent width (EW), emission line shape, luminosity (L), black hole mass (MBH), as well as, to determine relationships between physical properties such as the Baldwin effect (BE). To date, it is the mean composite spectrum with the largest number of quasars, reaching a máximum S/N ratio of 1418 per pixel at 2 367Á. It has been possible to identify the Gunn-Peterson effect at wavelengths shorter than Ly and a spectral image has also been obtained for wavelengths shorter than the Lyman limit (912Á) up to 516Á
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Vol. 44, No. 44