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We present two luminous UV/optical flares from the nuclei of apparentlyinactive early-type galaxies at z=0.37 and 0.33 that have the radiativeproperties of a flare from the tidal disruption of a star. In this paper wereport the second candidate tidal disruption event discovery in the UV by theGALEX Deep Imaging Survey, and present simultaneous optical light curves fromthe CFHTLS Deep Imaging Survey for both UV flares. The first few months of theUV/optical light curves are well fitted with the canonical t^(-5/3) power-lawdecay predicted for emission from the fallback of debris from a tidallydisrupted star. Chandra ACIS X-ray observations during the flares detect softX-ray sources with T_bb= (2-5) x 10^5 K or Gamma > 3 and place limits on hardX-ray emission from an underlying AGN down to L_X (2-10 keV) <~ 10^41 ergs/s.Blackbody fits to the UV/optical spectral energy distributions of the flaresindicate peak flare luminosities of > 10^44-10^45 ergs/s. The temperature,luminosity, and light curves of both flares are in excellent agreement withemission from a tidally disrupted main sequence star onto a central black holeof several times 10^7 msun. The observed detection rate of our search over ~2.9 deg^2 of GALEX Deep Imaging Survey data spanning from 2003 to 2007 isconsistent with tidal disruption rates calculated from dynamical models, and weuse these models to make predictions for the detection rates of the nextgeneration of optical synoptic surveys.

UV/Optical Detections of Candidate Tidal Disruption Events by GALEX and CFHTLS