Título

THE ATACAMA COSMOLOGY TELESCOPE: DATA CHARACTERIZATION AND MAPMAKING

Autor

David Hughes

Nivel de Acceso

Acceso Abierto

Licencia

http://creativecommons.org/licenses/by-nc-nd/4.0

Materias

Cosmic background radiation - (INSPEC) Cosmology: observations - (INSPEC) Instrumentation: miscellaneous - (INSPEC) CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA - (CTI) ASTRONOMÍA Y ASTROFÍSICA - (CTI) ASTRONOMÍA Y ASTROFÍSICA - (CTI)

Resumen o descripción

We present a description of the data reduction and mapmaking pipeline used for the 2008 observing season of theAtacama Cosmology Telescope (ACT). The data presented here at 148 GHz represent 12% of the 90 TB collected by ACT from 2007 to 2010. In 2008 we observed for 136 days, producing a total of 1423 hr of data (11 TB for the 148 GHz band only), with a daily average of 10.5 hr of observation. From these, 1085 hr were devoted to an 850 deg² stripe (11.2 hr by 9º.1) centered on a declination of −52º.7, while 175 hr were devoted to a 280 deg² stripe (4.5 hrby 4º.8) centered at the celestial equator. The remaining 163 hr correspond to calibration runs. We discuss sourcesof statistical and systematic noise, calibration, telescope pointing, and data selection. For the 148 GHz band, out of 1260 survey hours and 1024 detectors in the array, 816 hr and 593 effective detectors remain after data selection, yielding a 38% survey efficiency. The total sensitivity in 2008, determined from the noise level between 5 Hz and 20 Hz in the time-ordered data stream (TOD), is 32μK√s in cosmic microwave background units. Atmospheric brightness fluctuations constitute the main contaminant in the data and dominate the detector noise covariance atlow frequencies in the TOD. The maps were made by solving the least-squares problem using the Preconditioned Conjugate Gradient method, incorporating the details of the detector and noise correlations. Simulations, as wellas cross-correlations with Wilkinson Microwave Anisotropy Probe sky maps on large angular scales, reveal thatour maps are unbiased at multipoles ℓ >300. This paper accompanies the public release of the 148 GHz southern stripe maps from 2008. The techniques described here will be applied to future maps and data releases.

Editor

The Astrophysical Journal

Fecha de publicación

1 de enero de 2013

Tipo de publicación

Artículo

Versión de la publicación

Versión aceptada

Recurso de información

http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/2225

Formato

application/pdf

Idioma

Inglés

Audiencia

Estudiantes

Investigadores

Público en general

Sugerencia de citación

Dünner, Rolando., et al., (2013). The atacama cosmology telescope: data characterization and mapmaking, The Astrophysical Journal, Vol. 762(10):1-19

Repositorio Orígen

Repositorio Institucional del INAOE

Descargas

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