2020/05/30 by Tie Liu, Neal J. Evans, Kee‐Tae Kim +63 · 33 citations
Chemistry · Earth and Planetary Sciences · Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Atmospheric Ozone and Climate #Galaxy #Isotopologue #Line (geometry) #Luminosity #Physics #Spectral line #Spectroscopy and Laser Applications #Star (game theory) #Star formation #Stars #astro-ph.GA #astro-ph.SR
paper · pdf · doi:10.1093/mnras/staa1501
published in Monthly Notices of the Royal Astronomical Society 496(3), 2821-2835 (Oxford University Press) · Published on MNRAS. The full tables are included in Tables.pdf or Tables.tex files, which can be downloaded from source files
openalex publication_date 2020/05/30 · arxiv created 2020/07/08 · arxiv updated 2020/07/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/08
ABSTRACT We report studies of the relationships between the total bolometric luminosity (Lbol or LTIR) and the molecular line luminosities of J = 1 − 0 transitions of H13CN, H13CO+, HCN, and HCO+ with data obtained from ACA observations in the ‘ATOMS’ survey of 146 active Galactic star-forming regions. The correlations between Lbol and molecular line luminosities L′ \rm mol of the four transitions all appear to be approximately linear. Line emission of isotopologues shows as large scatters in Lbol–L′ \rm mol relations as their main line emission. The log(Lbol/L′ \rm mol) for different molecular line tracers have similar distributions. The Lbol-to-L′ \rm mol ratios do not change with galactocentric distances (RGC) and clump masses (Mclump). The molecular line luminosity ratios (HCN-to-HCO+, H13CN-to-H13CO+, HCN-to-H13CN, and HCO+-to-H13CO+) all appear constant against Lbol, dust temperature (Td), Mclump, and RGC. Our studies suggest that both the main lines and isotopologue lines are good tracers of the total masses of dense gas in Galactic molecular clumps. The large optical depths of main lines do not affect the interpretation of the slopes in star formation relations. We find that the mean star formation efficiency (SFE) of massive Galactic clumps in the ‘ATOMS’ survey is reasonably consistent with other measures of the SFE for dense gas, even those using very different tracers or examining very different spatial scales.