FUGIN hot core survey. I. Survey method and initial results for <i>l</i> = 10°–20°

Abstract We have developed a method to make spectral-line-based survey of hot cores, which represent an important stage high-mass star formation, and applied the data FUGIN (FOREST Unbiased Galactic plane Imaging with Nobeyama 45 m telescope) survey. First, we select core candidates by searching for weak tracer lines (HNCO CH3CN) stacking, then conduct follow-up pointed observations on these in C34S, SO, OCS, HC3N, HNCO, CH3CN, CH3OH J = 2–1 8–7 confirm characterize them. this l 10°–20° portion identified 22 “HotCores” (compact sources more than two significant detections lines, i.e., or lines) 14 “DenseClumps” (sources detection 2–1, lines). The HotCores are found be associated signposts formation such as ATLASGAL clumps, WISE H ii regions, Class II methanol masers. Many Herschel Hi-GAL clumps median mass 6.8 × 102 M⊙ bolometric luminosity 7.4 103 L⊙. Five seven stronger CH3CN exhibit elevated gas temperatures 50–100 K. These suggest that closely related stars medium high mass. For those their clump ratios consistent stages centered at phase. catalog provides useful starting point further statistical studies detailed forming regions.