The new multi-frequency instrument (MFI2) for the QUIJOTE facility in Tenerife

Hoyland, R. J.; Rubiño-Martín, J. A.; Alonso-Arias, P.; Aguiar-González, M.; Artal, E.; Ashdown, M.; Barreiro, Belén; Casas, F. J.; Colodro-Conde, Carlos; Hoz, E. de la; Fernández-Torreiro, M.; Fuerte-Rodríguez, Pablo A.; Génova-Santos, R. T.; Gómez-Reñasco, Maria F.; González-Carretero, Eduardo D.; González-González, Raul; Guidi, Frederica; Hernández-Monteagudo, Carlos; Herranz, D.; Lasenby, A.; López-Caraballo, C. H.; Martínez-Gonzalez, Enríque; Oria-Carreras, Asier; Peel, M.; Taoro, A.P. de; Pérez-Lemus, Cristina; Piccirillo, L.; Реболо, Р.; Rodriguez-Diaz, Jesus S.; Toledo-Moreo, R.; Vega-Moreno, A.; Vielva, P.; Watson, Robert; Zamora-Jimenez, Antonio

doi:10.1117/12.2640826

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Coaxial 30 dB couplers in the RF lines before the LNAs will allow us to inject a noise signal for calibration in to both circular polarizations. The backend will follow the design philosophy of the QUIJOTE-MFI2 instrument [5], using an FPGA based digital backend. The MFI2 FPGA (Xilinx ZCU208 Ultrascale) has the capability to simultaneously acquire eight RF channels at a sampling frequency of 5.0 GSps, a 2.5 GHz band and 1 MHz spectral resolution.…”

Section: Elfs On Simons Array: the P6/1instrumentmentioning

confidence: 99%

“…The European Low Frequency Survey (ELFS) is a long-term plan to deploy dedicated telescopes to produce a full-sky survey in the 5-100 GHz range with an unprecedented level of angular resolution (∼20 arcmin at 10 GHz), sub-GHz spectral resolution and sensitivity that will allow B-mode extraction from data produced by LiteBIRD, Simons Observatory and CMB-Stage 4 measurements. A first step (that we call ELFS on SA) is the deployment of a 6-12 GHz receiver (hereafter P6/12) in the Gregorian focus of one of the Simons Array telescopes [4], followed by the installation of the QUIJOTE-MFI2 [5] to cover the 10-20 GHz range.…”

Section: Introductionmentioning

confidence: 99%

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The European Low Frequency Survey

Mennella,

Arnold,

Azzoni

et al. 2024

EPJ Web Conf.

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In this paper we present the European Low Frequency Survey (ELFS), a project that will enable the detection of primordial B-mode polarization by measuring the Galactic and extra-Galactic foregrounds in the 5– 120 GHz frequency window. Indeed, the main difficulty in measuring the Bmode polarization comes not just from its sheer faintness, but from the fact that many other objects in the Universe also emit polarized microwaves, which mask the faint CMB signal. The first stage of this project will be carried out in synergy with the Simons Array (SA) collaboration, installing a 5.5–11 GHz coherent receiver at the focus of one of the three 3.5m SA telescopes in Atacama, Chile (“ELFS on SA”). The receiver will be equipped with a fully digital backend based on the latest Xilinx RF System-on-Chip devices that will provide frequency resolution of 1MHz across the whole observing band, allowing us to clean the scientific signal from unwanted radio frequency interference, particularly from low-Earth orbit satellite mega-constellations. This paper reviews the scientific motivation for ELFS and its instrumental characteristics, and provides an update on the development of ELFS on SA.

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Section: Elfs On Simons Array: the P6/1instrumentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The European Low Frequency Survey

Mennella,

Arnold,

Azzoni

et al. 2024

EPJ Web Conf.

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QUIJOTE scientific results – XIII. Intensity and polarization study of the microwave spectra of supernova remnants in the QUIJOTE-MFI wide survey: CTB 80, Cygnus Loop, HB 21, CTA 1, Tycho, and HB 9

López-Caraballo,

Ruiz-Granados,

Génova-Santos

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We use the new QUIJOTE-MFI wide survey (11, 13, 17, and 19 GHz) to produce spectral energy distributions (SEDs), on an angular scale of 1°, of the supernova remnants (SNRs) CTB 80, Cygnus Loop, HB 21, CTA 1, Tycho, and HB 9. We provide new measurements of the polarized synchrotron radiation in the microwave range. The intensity and polarization SEDs are obtained and modelled by combining QUIJOTE-MFI maps with ancillary data. In intensity, we confirm the curved spectra of CTB 80 and HB 21 with a break frequency νb at 2.0$^{+1.2}_{-0.5}$ and 5.0$^{+1.2}_{-1.0}$ GHz, respectively; and spectral indices above the break of $-0.6^{+0.04}_{-0.05}$ and $-0.86^{+0.04}_{-0.05}$. We provide constraints on the Anomalous Microwave Emission, suggesting that it is negligible towards these SNRs. From a simultaneous intensity and polarization fit, we recover synchrotron spectral indices as flat as −0.24, and the whole sample has a mean and scatter of −0.44 ± 0.12. The polarization fractions have a mean and scatter of 6.1 ± 1.9 per cent. When combining our results with the measurements from other QUIJOTE (Q-U-I JOint TEnerife CMB experiment) studies of SNRs, we find that radio spectral indices are flatter for mature SNRs, and particularly flatter for CTB 80 ($-0.24^{+0.07}_{-0.06}$) and HB 21 ($-0.34^{+0.04}_{-0.03}$). In addition, the evolution of the spectral indices against the SNRs age is modelled with a power-law function, providing an exponent −0.07 ± 0.03 and amplitude −0.49 ± 0.02 (at 10 kyr), which are conservative with respect to previous studies of our Galaxy and the Large Magellanic Cloud.

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The new multi-frequency instrument (MFI2) for the QUIJOTE facility in Tenerife

Cited by 2 publications

References 9 publications

The European Low Frequency Survey

The European Low Frequency Survey

QUIJOTE scientific results – XIII. Intensity and polarization study of the microwave spectra of supernova remnants in the QUIJOTE-MFI wide survey: CTB 80, Cygnus Loop, HB 21, CTA 1, Tycho, and HB 9

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