QUIJOTE Scientific results. III. Microwave spectrum of intensity and polarization in the Taurus molecular cloud Complex and L1527

Abstract

We present new intensity and polarization observations of the Taurus molecular cloud (TMC) region in the frequency range 10-20 GHz with the Multi-Frequency Instrument (MFI) mounted on the first telescope of the QUIJOTE experiment. From the combination of the QUIJOTE data with the WMAP 9-yr data release, the Planck second data release, the DIRBE maps and ancillary data, we detect an anomalous microwave emission (AME) component with flux density $S_{\mathrm{AME},\mathrm{peak}}=43.0\pm 7.9$Jy in the Taurus Molecular Cloud (TMC) and $S_{\mathrm{AME},\mathrm{peak}}=10.7\pm 2.7$Jy in the dark cloud nebula L1527, which is part of the TMC. In the TMC the diffuse AME emission peaks around a frequency of 19 GHz, compared with an emission peak about a frequency of 25 GHz in L1527. In the TMC, the best constraint on the level of AME polarisation is obtained at the Planck channel of 28.4 GHz, with an upper limit ${\pi }_{\mathrm{AME}}<$4.2$\%$ (95$\%$ C. L.), which reduces to ${\pi }_{\mathrm{AME}}<$3.8$\%$ (95$\%$ C.L.) if the intensity of all the free-free, synchrotron and thermal dust components are negligible at this frequency. The same analysis in L1527 leads to ${\pi }_{\mathrm{AME}}<$5.3$\%$ (95$\%$C.L.), or ${\pi }_{\mathrm{AME}}<$4.5$\%$ (95$\%$C.L.) under the same assumption. We find that in the TMC and L1527 on average about $80\%$ of the HII gas should be mixed with thermal dust. Our analysis shows how the QUIJOTE-MFI 10-20 GHz data provides key information to properly separate the synchrotron, free-free and AME components.

Accepted for publication in the MNRAS, 27 pages, 19 Figures, 12 Tables

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• QUIJOTE scientific results -- X. Spatial variations of Anomalous Microwave Emission along the Galactic plane
• BeyondPlanck XVI. Limits on Large-Scale Polarized Anomalous Microwave Emission from Planck LFI and WMAP
• QUIJOTE Scientific Results -- XVII. Studying the Anomalous Microwave Emission in the Andromeda Galaxy with QUIJOTE-MFI
• The PICASSO map-making code: application to a simulation of the QUIJOTE northern sky survey
• QUIJOTE scientific results -- V. The microwave intensity and polarisation spectra of the Galactic regions W49, W51 and IC443
• QUIJOTE scientific results -- XVIII. New constraints on the polarization of the Anomalous Microwave Emission in bright Galactic regions: $\rho$\,Ophiuchi, Perseus and W43
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