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Molecular Gas at High Redshift

Molecular Gas at High Redshift

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going to the highest redshifts, z>>5<br />

will we loose CO as our main tracer?<br />

problem I: conversion factor <strong>at</strong> low metallicities?<br />

problem II: the CMB is not our friend<br />

Tex = 18 K<br />

Tex = 40 K<br />

LOBSERVED / LINTRINSIC<br />

LOBSERVED / LINTRINSIC<br />

0 2 4 6 8 10<br />

redshift<br />

0 2 4 6 8 10<br />

redshift<br />

da Cunha et al. 2012

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