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Anomalous microwave emission (AME) has been observed in numerous sky regions,in the frequency range ~10-60 GHz. One of the most scrutinized regions isG159.6-18.5, located within the Perseus molecular complex. In this paper wepresent further observations of this region (194 hours in total over ~250deg^2), both in intensity and in polarization. They span four frequencychannels between 10 and 20 GHz, and were gathered with QUIJOTE, a new CMBexperiment with the goal of measuring the polarization of the CMB and Galacticforegrounds. When combined with other publicly-available intensity data, weachieve the most precise spectrum of the AME measured to date, with 13independent data points being dominated by this emission. The four QUIJOTE datapoints provide the first independent confirmation of the downturn of the AMEspectrum at low frequencies, initially unveiled by the COSMOSOMAS experiment inthis region. We accomplish an accurate fit of these data using models based onelectric dipole emission from spinning dust grains, and also fit some of theparameters on which these models depend.  We also present polarization maps with an angular resolution of ~1 deg and asensitivity of ~25 muK/beam. From these maps, which are consistent with zeropolarization, we obtain upper limits of Pi<6.3% and <2.8% (95% C.L.)respectively at 12 and 18 GHz, a frequency range where no AME polarizationobservations have been reported to date. These constraints are compatible withtheoretical predictions of the polarization fraction from electric dipoleemission originating from spinning dust grains. At the same time, they rule outseveral models based on magnetic dipole emission from dust grains ordered in asingle magnetic domain, which predict higher polarization levels. FutureQUIJOTE data in this region may allow more stringent constraints on thepolarization level of the AME.

Measurements of the Intensity and Polarization of the Anomalous Microwave Emission in the Perseus molecular complex with QUIJOTE