Diffuse molecular gas at high redshift: Detection of CO molecules and the 2175 Å dust feature at z=1.64

Details Diffuse molecular gas at high redshift: Detection of CO molecules and the 2175 Å dust feature at z=1.64 Diffuse molecular gas at high redshift: Detection of CO molecules and the 2175 Å dust feature at z=1.64

2009-06-08

arxiv.org/abs/0906.1585v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 4 figures, 2 tables, accepted for publication in A&A

Scientific paper

We present the detection of carbon monoxide molecules (CO) at z=1.6408 towards the quasar SDSSJ160457.50+220300.5 using the VLT Ultraviolet and Visual Echelle Spectrograph. CO absorption is detected in at least two components in the first six A-X bands and one d-X(5-0) inter-band system. This is the second detection of this kind along a quasar line of sight. The CO absorption profiles are well modelled assuming a rotational excitation of CO in the range 6

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