Tareas en DPAC

 


Visión General

En 2007 la ESA emitió un Anunció de Oportunidad (AO), para seleccionar un consorcio científico a cargo del diseño, la gestión y la reducción de los datos producidos por Gaia. La comunidad científica europea, organizada en el DACC (Comité de Coordinación de Análisis de Datos) que incluía a miembros de nuestro equipo, respondió con una propuesta (véase la referencia más abajo) por el Consorcio de Procesado y Análisis de Datos (Data Processing and Analysis Consortium, DPAC) de Gaia seleccionada por la ESA. El consorcio DPAC está básicamente organizado en torno a nueve Unidades de Coordinación (CUs) y supervisado por el Comité Ejecutivo de DPAC (DPACE). Más información en Visión general de DPAC

CU1: Arquitectura del Sistema

Nuestro grupo ha desarrollado las rutinas TmTools, que han servido como interfaz entre los simuladores (GASS y GIBIS, simuladores de CU2) y los sistemas de procesado de datos (empezando en CU1 Misión Centro de Operaciones de Interfaz de Tareas, MIT, y CU3: Tratamiento Inicial de Datos, IDT) . Durante las operaciones, las rutinas TmTools se utilizan para la decodificación de la telemetría tal como llega desde el satélite.
Además, nuestro grupo participa en la Junta de Control de Configuración (CCB) para la definición del modelo de datos de la base de datos principal (para las secciones CU2 y CU3).

CU2: Simulaciones

CU2 es la encargada de desarrollar los simuladores de Gaia que facilitan datos simulados para permitir el desarrollo y la validación de los procedimientos de reducción de datos de la misión, además de generar grandes muestras simuladas para uso de las otras CUs. El equipo de Barcelona tiene una fuerte participación en esta Unidad de Coordinación. Somos responsables de varios de los módulos más importantes, como dos de los generadores de datos: GASS, diseñado para generar grandes conjuntos de datos de telemetría de Gaia con el fin de preparar los algoritmos de reducción de datos; y GOG, capaz de generar una simulación del catálogo final. Entre otros, se han simulado varios días de telemetría completa y una imagen completa del cielo. Más información en CU2: Simulaciones

CU3: Procesado Principal

La tarea de la CU3 es organizar y poner en marcha la cadena de procesado de datos desde la recepción de la primera telemetría desde el satélite hasta la solución astrométrica principal. Gracias a nuestra experiencia y profundo conocimiento de la misión, nuestro grupo está a cargo, desde el comienzo de DPAC, del diseño y de la mayor parte de la implementación de IDT e IDU. Más información en CU3: Procesado Principal

 

CU5: Fotometría

Participamos también en la Unidad de Fotometría, encargada de definir y desarrollar el tratamiento, la calibración y la publicación de los datos fotométricos y espectrofométricos. Nuestro grupo lidera dos unidades de desarrollo (DUs): DU12 (responsable de la definición de modelos de calibración interna) y DU16 (responsable de la selección de fuentes de referencia internas para la calibración de flujo y longitud de onda) y colabora en la DU13 (responsable de las observaciones terrestres para la calibración de flujos absolutos). Más información en CU5: Fotometría

CU9: Acceso al Catálogo

ESA emitió un Anuncio de Oportunidad para el diseño implementación y operación del archivo de Gaia, delegado por la ESA a la comunidad científica a través de un nueva unidad de coordinación, la CU9. Un consorcio liderado por X.Luri fue nombrado formalmente por la ESA para esta tarea en febrero 2013, lo que es muy relevante si tenemos en cuenta que Gaia no tiene ningún investigador principal de instrumento. Este gran éxito también nos ha permitido liderar un proyecto FP7 GENIUS dedicado a complementar las tareas de la CU9.

Tenemos varios equipos de trabajo dentro de la CU9, como en las tareas de validación, las actividades educativas y de divulgación o en el desarrollo de herramientas científicas avanzadas. Más información en CU9: Acceso al Catálogo

DPCB: Centro de Procesado de Datos de Barcelona

El Centro de Procesado de Datos de Barcelona (DPCB) debe proporcionar los recursos necesarios para probar algunos algoritmos críticos de la reducción de datos en un entorno realista (entregado a ESAC); para ejecutar el simulador GASS (incluyendo simulaciones a gran escala), y especialmente debe proporcionar recursos para la ejecución de IDU durante las operaciones de reprocesamiento de datos reales desde el satélite. Por lo tanto, DPCB juega un papel clave en DPAC.

Está compuesto por CSUC (para pruebas con IDT), BSC-CNS (para simulaciones GASS  y ejecuciones IDU), y nuestro equipo. Los importantes desarrollos del software asociados a estas operaciones, principalmente en relación con la infraestructura de ejecución, a cargo de nuestro equipo con el apoyo del equipo de ingeniería de BSC-CNS y el equipo de CSUC que proporcionan apoyo en el procedimiento y configuración de la base de datos. Más información en DPCB: Centro de Procesado de Datos de Barcelona

Grupos de trabajo: RTF, CTF, OITF

Varios miembros de nuestro equipo pertenecen a algunos de los grupos de trabajo de interconexión entre CUs, creados para estudiar problemas específicos de la misión: el Grupo de Trabajo de Radiación (Radiation Task Force, RTF) estudia la manera de corregir los daños de la radiación en el procesado de datos de Gaia, y la coordinación entre las diferentes CUs de la implementación de las medidas; El grupo de trabajo de Calibración (Callibration Task Force. CTF), que está a cargo de la definición de las actividades de calibración; y el grupo de trabajo de comportamiento de las CCD (Offset Instability Task Force, OITF) para hacer frente a cuestiones relacionadas con la inestabilidad PEM-CCD.

DPACE

El comité ejecutivo de DPAC (Gaia Data Processing y Analysis Consortium Executive, DPACE) se fundó en junio de 2006 y supervisa las actividades del consorcio DPAC. Xavi Luri es el representante de la CU9 (Acceso al Catálogo) en DPACE.

Member of DPACE in 2013

GST

La misión del equipo científico de Gaia (Gaia Science Team, GST) es asesorar a la ESA, a través del Científico Principal del Proyecto (Project Scientist), en todos los aspectos tanto a nivel puramente científico como de política y organización científica de la misión. Carme Jordi es miembro de GST.

GST2013_200

 

 

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