ALMA survey of CO(7-6) and [C I](2-1) in 18 z~6 quasars yields molecular gas mass estimates from multiple tracers and indicates that PDR models cannot fully account for the observed excitation, pointing to additional heating processes.
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Multi-transition CO observations reveal that the star formation-molecular gas relation becomes more linear for denser gas tracers, implying a volume density power-law index of approximately 1.5.
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CO(7-6) and [C I](2-1) survey in z > 6 quasars
ALMA survey of CO(7-6) and [C I](2-1) in 18 z~6 quasars yields molecular gas mass estimates from multiple tracers and indicates that PDR models cannot fully account for the observed excitation, pointing to additional heating processes.
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Constraining the Molecular Kennicutt-Schmidt Relation with Multi-Transition CO Observations of Nearby Galaxies
Multi-transition CO observations reveal that the star formation-molecular gas relation becomes more linear for denser gas tracers, implying a volume density power-law index of approximately 1.5.