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We present the results of observations of blazar PKS 1510-089 with theHerschel Space Observatory PACS and SPIRE instruments, together withmultiwavelength data from Fermi/LAT, Swift, SMARTS and SMA. The source wasfound in a quiet state, and its far-infrared spectrum is consistent with apower-law with a spectral index of alpha ~ 0.7. Our Herschel observations werepreceded by two 'orphan' gamma-ray flares. The near-infrared data reveal thehigh-energy cut-off in the main synchrotron component, which cannot beassociated with the main gamma-ray component in a one-zone leptonic model. Thisis because in such a model the luminosity ratio of the External-Compton andsynchrotron components is tightly related to the frequency ratio of thesecomponents, and in this particular case an unrealistically high energy densityof the external radiation would be implied. Therefore, we consider awell-constrained two-zone blazar model to interpret the entire dataset. In thisframework, the observed infrared emission is associated with the synchrotroncomponent produced in the hot-dust region at the supra-pc scale, while thegamma-ray emission is associated with the External-Compton component producedin the broad-line region at the sub-pc scale. In addition, the optical/UVemission is associated with the accretion disk thermal emission, with theaccretion disk corona likely contributing to the X-ray emission.

Herschel PACS and SPIRE observations of blazar PKS 1510-089: a case for two blazar zones