We present observations of the intermediate to massive star-forming region I05345+3157 using the molecular line tracer CS ( 2 - 1 ) with CARMA to reveal the properties of the dense gas cores .
Seven gas cores are identified in the integrated intensity map of CS ( 2 - 1 ) .
Among these , core 1 and core 3 have counterparts in the \lambda = 2.7 mm continuum data .
We suggest that core 1 and core 3 are star-forming cores that may already or will very soon harbor young massive protostars .
The total masses of core 1 estimated from the LTE method and dust emission by assuming a gas-to-dust ratio are 5 \pm 1 M _ { \sun } and 18 \pm 6 M _ { \sun } , and that of core 3 are 15 \pm 7 M _ { \sun } and 11 \pm 3 M _ { \sun } .
The spectrum of core 3 shows blue-skewed self-absorption , which suggests gas infall – a collapsing core .
The observed broad linewidths of the seven gas cores indicate non-thermal motions .
These non-thermal motions can be interactions with nearby outflows or due to the initial turbulence ; the former is observed , while the role of initial turbulence is less certain .
Finally , the virial masses of the gas cores are larger than the LTE masses , which for a bound core implies a requirement on the external pressure of \sim 10 ^ { 8 } K cm ^ { -3 } .
The cores have the potential to further form massive stars .