CO luminosity - line width correlation of sub-millimeter galaxies and a possible cosmological application

Abstract

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, and thus inconclusive. Aims. We aim to prove or dis-prove the L_CO -FWHM correlation. Methods. We compile a large sample of submm galaxies at z>2 from the literature, and investigate 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 there exist a weak but significant correlation between L_CO and FWHM. We also discuss a feasibility to measure the cosmological distance using the correlation.

arXiv comment4 pages, 3 figures. Accepted for publication in A&A. A related video is at https://youtu.be/scWMFurOJi8

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• The implications of the surprising existence of a large, massive CO disk in a distant protocluster
• A Total Molecular Gas Mass Census in z~2-3 Star-forming Galaxies: Low-J CO Excitation Probes of Galaxies' Evolutionary States
• No Ly$\alpha$ emitters detected around a QSO at z=6.4: Suppressed by the QSO?
• A model of spectral line broadening in signal forecasts for line-intensity mapping experiments
• Luminosity-duration relation of fast radio bursts
• Discovery of a protocluster core associated with an enormous Ly$\alpha$ Nebula at $z=2.3$
• Multiwavelength characterisation of an ACT-selected, lensed dusty star-forming galaxy at z=2.64
• A scaling relation in [C II]-detected galaxies and its likely application in cosmology
• Implications for galaxy property estimation revealed by CO luminosity-FWHM relations in local star-forming galaxies