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We have developed a method to make a spectral-line-based survey of hot cores,which represent an important stage of high-mass star formation, and applied themethod to the data of the FUGIN (FOREST Unbiased Galactic plane Imaging surveywith the Nobeyama 45-m telescope) survey. First, we select hot core candidatesby searching the FUGIN data for the weak hot core tracer lines (HNCO andCH$_3$CN) by stacking, and then we conduct follow-up pointed observations onthese candidates in C$^{34}$S, SO, OCS, HC$_3$N, HNCO, CH$_3$CN, and CH$_3$OH$J=2-1$ and $J=8-7$ lines to confirm and characterize them. We applied thismethod to the $l = 10^\circ-20^\circ$ portion of the FUGIN data and identified22 "Hot Cores" (compact sources with more than two significant detection of thehot core tracer lines, i.e., SO, OCS, HC$_3$N, HNCO, CH$_3$CN, or CH$_3$OH$J=8-7$ lines) and 14 "Dense Clumps" (sources with more than two significantdetection of C$^{34}$S, CH$_3$OH $J=2-1$, or the hot core tracer lines). Theidentified Hot Cores are found associated with signposts of high-mass starformation such as ATLASGAL clumps, WISE HII regions, and Class II methanolmasers. For those associated with ATLASGAL clumps, their bolometric luminosityto clump mass ratios are consistent with the star formation stages centered atthe hot core phase. The catalog of FUGIN Hot Cores provides a useful startingpoint for further statistical studies and detailed observations of high-massstar forming regions.

FUGIN hot core survey. I. Survey method and initial results for $l = 10^\circ-20^\circ$