期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 4, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2022/04/035
关键词
CMBR experiments; CMBR theory; cosmological parameters from CMBR; grav-itational waves and CMBR polarization
资金
- ANR (Agence Nationale de la Recherche)
- DIM-ACAV (Domaine d'Interet Majeur-Astronomie et Conditions d'Apparition de la Vie)
- Labex UnivEarthS (Universite de Paris)
- CNRS/IN2P3 (Centre National de la Recherche Scientifique/Institut National de Physique Nucleaire et de Physique des Particules)
- CNRS/INSU (Centre National de la Recherche Scientifique/Institut National des Sciences de l'Univers)
- CNR/PNRA (Consiglio Nazionale delle Ricerche/Programma Nazionale Ricerche in Antartide)
- INFN (Istituto Nazionale di Fisica Nucleare)
- MINCyT (Ministerio de Ciencia, Tecnologia e Innovacion)
- CNEA (Comision Nacional de Energia Atomica)
- CONICET (Consejo Nacional de Investigaciones Cientificas y Tecnicas)
- National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility located at Lawrence Berkeley National Laboratory [DE-AC02-05CH11231]
Bolometric interferometry is a novel technique for spectral imaging, which can differentiate between the cosmic microwave background and astrophysical foregrounds. This paper illustrates the methodology using QUBIC and investigates point source reconstruction and Galactic dust mapping, as well as the noise properties of spectral imaging.
Bolometric interferometry is a novel technique that has the ability to perform spectral imaging. A bolometric interferometer observes the sky in a wide frequency band and can reconstruct sky maps in several sub-bands within the physical band in post-processing of the data. This provides a powerful spectral method to discriminate between the cosmic mi-crowave background (CMB) and astrophysical foregrounds. In this paper, the methodology is illustrated with examples based on the Q & U Bolometric Interferometer for Cosmology (QUBIC) which is a ground-based instrument designed to measure the B-mo de polarization of the sky at millimeter wavelengths. We consider the specific cases of point source reconstruc-tion and Galactic dust mapping and we characterize the point spread function as a function of frequency. We study the noise properties of spectral imaging, especially the correlations between sub-bands, using end-to-end simulations together with a fast noise simulator. We conclude showing that spectral imaging performance are nearly optimal up to five sub-bands in the case of QUBIC.
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