QUIJOTE scientific results - VII. Galactic AME sources in the QUIJOTE-MFI northern hemisphere wide survey

Poidevin, F.; Génova-Santos, R. T.; Rubiño-Martín, J. A.; López-Caraballo, C. H.; Watson, R. A.; Artal, E.; Ashdown, M.; Barreiro, R. B.; Casas, F. J.; de la Hoz, E.; Fernández-Torreiro, M.; Guidi, F.; Herranz, D.; Hoyland, R. J.; Lasenby, A. N.; Martinez-Gonzalez, E.; Peel, M. W.; Piccirillo, L.; Rebolo, R.; Ruiz-Granados, B.; Tramonte, D.; Vansyngel, F.; Vielva, P.
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Monthly Notices of the Royal Astronomical Society

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The QUIJOTE-MFI Northern Hemisphere Wide Survey has provided maps of the sky above declinations -30° at 11, 13, 17, and 19 GHz. These data are combined with ancillary data to produce Spectral Energy Distributions in intensity in the frequency range 0.4-3 000 GHz on a sample of 52 candidate compact sources harbouring anomalous microwave emission (AME). We apply a component separation analysis at 1° scale on the full sample from which we identify 44 sources with high AME significance. We explore correlations between different fitted parameters on this last sample. QUIJOTE-MFI data contribute to notably improve the characterization of the AME spectrum, and its separation from the other components. In particular, ignoring the 10-20 GHz data produces on average an underestimation of the AME amplitude, and an overestimation of the free-free component. We find an average AME peak frequency of 23.6 ± 3.6 GHz, about 4 GHz lower than the value reported in previous studies. The strongest correlation is found between the peak flux density of the thermal dust and of the AME component. A mild correlation is found between the AME emissivity (AAME/τ250) and the interstellar radiation field. On the other hand no correlation is found between the AME emissivity and the free-free radiation Emission Measure. Our statistical results suggest that the interstellar radiation field could still be the main driver of the intensity of the AME as regards spinning dust excitation mechanisms. On the other hand, it is not clear whether spinning dust would be most likely associated with cold phases of the interstellar medium rather than with hot phases dominated by free-free radiation.
Related projects
The QUIJOTE experiment at the Teide Observatory
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QUIJOTE es un programa de dos telescopios y su batería de instrumentos, instalados en el Observatorio del Teide, dedicados fundamentalmente a la caracterización de la polarización del Fondo Cósmico de Microondas, en el rango de frecuencias de 10-42 GHz.
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Full-sky map showing the spatial distribution of the primary anisotropies of the Cosmic Microwave Background (generated 380,000 years after the Big Bang) derived from observations of the Planck satellite
Anisotropy of the Cosmic Microwave Background
The general goal of this project is to determine and characterize the spatial and spectral variations in the temperature and polarisation of the Cosmic Microwave Background in angular scales from several arcminutes to several degrees. The primordial matter density fluctuations which originated the structure in the matter distribution of the present
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