QUIJOTE scientific results – V. The microwave intensity and polarization spectra of the Galactic regions W49, W51 and IC443

ABSTRACT We present new intensity and polarization maps obtained with the QUIJOTE experiment towards Galactic regions W49, W51 IC443, covering frequency range from 10 to 20 GHz at $\sim 1\, \text{deg}$ angular resolution, a sensitivity in 35–79 $\mu \text{K}\, \text{beam}^{-1}$ for total 13–23 polarization. For each region, we combine ancillary data frequencies ranging 0.4 3000 GHz, reconstruct spectral energy distribution model it combination of known foregrounds. detect anomalous microwave emission (AME) W49 4.7σ 4.0σ peak $\nu _{\rm AME}=(20.0\pm 1.4)\, \text{GHz}$ AME}=(17.7\pm 3.6)\, \text{GHz}$, respectively; this is first detection AME W51. The contamination ultracompact H ii residual flux density estimated per cent 5 W51, does not rule out detection. polarized SEDs reveal synchrotron contribution indices αs = −0.67 ± 0.10 −0.51 0.07 ascribed diffuse local supernova remnant, respectively. Towards IC443 measure broken power-law spectrum cut-off 0,s}=(114\pm 73)\, agreement previous studies; our analysis, however, rules any which had been previously claimed IC443. No evidence detected study.