ALMA view of the Galactic super star cluster RCW 38 at 270 au resolution

We report millimeter/submillimeter continuum and molecular line observations of the Galactic super star cluster RCW 38, obtained from Atacama Large Millimeter/Submillimeter Array with a minimum angular resolution $0''.17\times0''.15$ ($\simeq289\,{\rm AU}\times255\,{\rm AU}$). The C$^{18}$O image reveal many massive condensations embedded within filamentary structures extending along northwest-southeast direction in center cluster. have sizes 0.01-0.02 pc, H$_2$ column densities $10^{23}$-$10^{24}$ cm$^{-2}$, masses 10-130 $M_\odot$. In addition, 233-GHz reveals two dense, small millimeter-sources radii 460 200 AU (Source A Source B). is most condensation, whereas no counterpart seen for B. B are estimated as 13 3 $M_\odot$ at optically-thin limit, respectively. emission shows velocity gradient 2 km s$^{-1}$ central 2000 A, which could be interpreted Keplerian rotation mass few or infall motion gas. Further, ALMA $^{12}$CO data that associated outflows exhibiting maximum velocities $\sim$30-70 s$^{-1}$. short dynamical timescales $<$1000 yr high outflow rates $\sim10^{-4}$-$10^{-3}$ yr$^{-1}$. These observational signatures suggest an early evolutionary phase formation