Volume 579, July 2015
|Number of page(s)||4|
|Published online||19 June 2015|
CO luminosity – line-width correlation of submillimeter galaxies and a possible cosmological application
1 National Tsing Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan 30013, ROC
2 Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Denmark
Received: 10 March 2015
Accepted: 21 April 2015
Context. A possible correlation between CO luminosity (LCO) 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 LCO-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 LCO and FWHM. We also discuss a feasibility to measure the cosmological distance using the correlation.
Key words: methods: observational / distance scale / submillimeter: galaxies
© ESO, 2015
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