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1ES 1011+496 $(z=0.212)$ was discovered in very high energy (VHE, E >100 GeV)$\gamma$-rays with MAGIC in 2007. The absence of simultaneous data at lowerenergies led to a rather incomplete characterization of the broadband spectralenergy distribution (SED). We study the source properties and the emissionmechanisms, probing whether a simple one-zone synchrotron-self-Compton (SSC)scenario is able to explain the observed broadband spectrum. We analyzed VHE toradio data from 2011 and 2012 collected by MAGIC, $Fermi$-LAT, $Swift$, KVA,OVRO, and Mets\"ahovi in addition to optical polarimetry data and radio mapsfrom the Liverpool Telescope and MOJAVE. The VHE spectrum was fit with a simplepower law with a photon index of $3.69\pm0.22$ and a flux above 150 GeV of$(1.46\pm0.16)\times10^{-11}$ ph cm$^{-2}$ s$^{-1}$. 1ES 1011+496 was found tobe in a generally quiescent state at all observed wavelengths, showing onlymoderate variability from radio to X-rays. A low degree of polarization of lessthan 10% was measured in optical, while some bright features polarized up to60% were observed in the radio jet. A similar trend in the rotation of theelectric vector position angle was found in optical and radio. The radio mapsindicated a superluminal motion of $1.8\pm0.4\,c$, which is the highest speedstatistically significantly measured so far in a high-frequency-peaked BL Lac.For the first time, the high-energy bump in the broadband SED of 1ES 1011+496could be fully characterized from 0.1 GeV to 1 TeV which permitted a morereliable interpretation within the one-zone SSC scenario. The polarimetry datasuggest that at least part of the optical emission has its origin in some ofthe bright radio features, while the low polarization in optical might be dueto the contribution of parts of the radio jet with different orientations ofthe magnetic field to the optical emission.

Insights into the emission of the blazar 1ES 1011+496 through unprecedented broadband observations during 2011 and 2012