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Previous observations have revealed an accretion disk and outflow motion inhigh-mass star-forming region G192.16-3.84. While collapse have not beenreported before. We present here molecular line and continuum observationstoward massive core G192.16-3.84 with the Submillimeter Array. C$^{18}$O(2-1)and HCO$^{+}$(3-2) lines show pronounced blue profiles, indicating gasinfalling in this region. This is the first time that the infall motion hasbeen reported in G192.16-3.84 core. Two-layer model fitting gave infallvelocities of 2.0$\pm$0.2 and 2.8$\pm$0.1 km s$^{-1}$. Assuming that the cloudcore follows a power-law density profile ($\rho$$\propto$$r^{1.5}$), thecorresponding mass infall rates are (4.7$\pm$1.7)$\times10^{-3}$ and(6.6$\pm$2.1)$\times10^{-3}$ M$_{\sun}$ yr$^{-1}$ for C$^{18}$O(2-1) andHCO$^{+}$(3-2), respectively. The derived infall rates are in agreement withthe turbulent core model and those in other high-mass star-forming regions,suggesting that high accretion rate is a general requirement to form a massivestar.

Gas infall in the massive star formation core G192.16-3.84