H_2 molecules in damped systems

Details H_2 molecules in damped systems H_2 molecules in damped systems

2001-09-10

arxiv.org/abs/astro-ph/0109155v1

Astronomy and Astrophysics

Astrophysics

4 pages. To appear in the Proceedings of the XVII IAP Colloquium "Gaseous Matter in Galaxies and Intergalactic Space"

Scientific paper

Damped Lyman alpha systems seen in the spectra of high-z QSOs arise in high-density neutral gas in which molecular hydrogen (H_2) should be conspicuous. Systematic searches to detect the H_2 lines redshifted into the Lyman alpha forest at <3400\AA are now possible thanks to the unique capabilities of UVES on the VLT. Here we summarise the present status of our on going programme to search for H_2 in DLAs, discuss the physical conditions in the systems where H_2 is detected and the implications of non-detections.

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