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We performed the observation of the flux densities of Sgr A* at 90 and 102GHz on 6 April 2005 using the Nobeyama Millimeter Array in order to detect thetime lag between these frequencies. We constructed light curves covering a fewhour with 1 min bin, and the Intra-Day Variability, which had a rising phaseand intensity peak, of Sgr A* is clearly seen at both frequencies. Wecalculated the z-transformed discrete correlation function between the lightcurves of Sgr A* at 90 and 102 GHz. The derived time lag of the flares at thesefrequencies was approximately zero, contrary to our expectations based on thepreviously reported time lag at lower frequencies. If the radio flares of SgrA* are explained by the expanding plasma model, the light curve at 90 GHz wouldbe delayed with respect to the one at 102 GHz. However, we could not find sucha delay with statistical significance in our data.

Time Lag in Sgr A* Intra-Day Variability between the light curves at 90 and 102 GHz