[ERG2015] 5009 , the SIMBAD biblio

We sort 4683 molecular clouds between 10° l µm sources, mid-IR color-selected YSOs, H₂O and CH₃OH masers, and UCH ii regions. We also present a combined NH₃-derived gas kinetic temperature and H₂O maser catalog for 1788 clumps from our own GBT 100 m observations and from the literature. We identify a subsample of 2223 (47.5%) starless clump candidates (SCCs), the largest and most robust sample identified from a blind survey to date. Distributions of flux density, flux concentration, solid angle, kinetic temperature, column density, radius, and mass show strong (>1 dex) progressions when sorted by star formation indicator. The median SCC is marginally subvirial (α ∼ 0.7) with >75% of clumps with known distance being gravitationally bound (α M ∼ 170-370 M_☉ from the starless candidates to clumps associated with protostars. This trend could be due to (i) mass growth of the clumps at {dot}M∼200–440 M_☉ M/yr for an average freefall 0.8 Myr timescale, (ii) a systematic factor of two increase in dust opacity from starless to protostellar phases, and/or (iii) a variation in the ratio of starless to protostellar clump lifetime that scales as ∼M ^–0.4. By comparing to the observed number of CH₃OH maser containing clumps, we estimate the phase lifetime of massive (M > 10³ M_☉) starless clumps to be 0.37±0.08 Myr (M/10³ M_☉)^–1; the majority (M M_☉) have phase lifetimes longer than their average freefall time.