Journal
ASTRONOMY & ASTROPHYSICS
Volume 579, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201526062
Keywords
methods: observational; distance scale; submillimeter: galaxies
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Funding
- Ministry of Science and Technology of Taiwan [NSC 103-2112-M-007-002-MY3]
- Danish National Research Foundation
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Context. A possible correlation between CO luminosity (L-CO') and its line width (FWHM) has been suggested and denied in the literature. Such claims were often based on a small or heterogeneous sample of galaxies, hence were inconclusive. Aims. We aim to prove or disprove the L-CO'-FWHM correlation. Methods. We compiled a large sample of sub-mm galaxies at z > 2 from the literature and investigated the L-CO'-FWHM relation. Results. After carefully evaluating the selection effects and uncertainties, such as inclination and magnification via gravitational lensing, we show that a weak but significant correlation exists between L-CO' and FWHM. We also discuss a feasibility to measure the cosmological distance using the correlation.
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