Discovery of a Perseus-like cloud in the early Universe - H I-to-H2 transition, carbon monoxide and small dust grains at zabs≈ 2.53 towards the quasar J0000+0048

P. Noterdaeme; J.-K. Krogager; S. Balashev; J. Ge; N. Gupta; T. Krühler; C. Ledoux; M. T. Murphy; I. Pâris; P. Petitjean; H. Rahmani; R. Srianand; W. Ubachs

doi:10.1051/0004-6361/201629173

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Volume 597 (January 2017)

A&A, 597 (2017) A82

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Fig. 13

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Portion of the X-shooter NIR spectrum around the Na i doublet. Na iλ5891 and Na iλ5897 are redshifted at 2.077 and 2.079 μm, respectively. The red curve corresponds to the Voigt-profile fit using fixed velocity decomposition from Mg i.

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