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Radio emission from radio-quiet quasars may be due to star formation in thequasar host galaxy, to a jet launched by the supermassive black hole, or torelativistic particles accelerated in a wide-angle radiatively-driven outflow.In this paper we examine whether radio emission from radio-quiet quasars is abyproduct of star formation in their hosts. To this end we use infraredspectroscopy and photometry from Spitzer and Herschel to estimate or placeupper limits on star formation rates in hosts of ~300 obscured and unobscuredquasars at z<1. We find that low-ionization forbidden emission lines such as[NeII] and [NeIII] are likely dominated by quasar ionization and do not providereliable star formation diagnostics in quasar hosts, while PAH emissionfeatures may be suppressed due to the destruction of PAH molecules by thequasar radiation field. While the bolometric luminosities of our sources aredominated by the quasars, the 160 micron fluxes are likely dominated by starformation, but they too should be used with caution. We estimate median starformation rates to be 6-29 Msun/year, with obscured quasars at the high end ofthis range. This star formation rate is insufficient to explain the observedradio emission from quasars by an order of magnitude, with log(L_radio,observed/L_radio, SF)=0.6-1.3 depending on quasar type and star formationestimator. Although radio-quiet quasars in our sample lie close to the 8-1000micron infrared / radio correlation characteristic of the star-forminggalaxies, both their infrared emission and their radio emission are dominatedby the quasar activity, not by the host galaxy.

Star formation in quasar hosts and the origin of radio emission in radio-quiet quasars