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Molecular hydrogen in absorption at high redshifts

Abstract : Absorption lines from molecular hydrogen (H2) in the spectra of background sources are a powerful probe of the physical conditions in intervening cold neutral medium. At high redshift, z >2 , H2 lines are conveniently shifted in the optical domain, allowing the use of ground-based telescopes to perform high-resolution spectroscopy, which is essential for a proper analysis of the cold gas. We describe recent observational progress, based on the development of efficient pre-selection techniques in low-resolution spectroscopic surveys such as the Sloan Digital Sky Survey (SDSS). The next generation of spectrographs with high blue-throughput, such as CUBES, will certainly significantly boost the efficiency and outcome of follow-up observations. In this paper, we discuss high priority science cases for CUBES, building on recent H2 observations at high-z: probing the physical conditions in the cold phase of regular galaxies and outflowing gas from active galactic nucleus.
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Submitted on : Tuesday, August 9, 2022 - 12:20:53 PM
Last modification on : Wednesday, August 10, 2022 - 3:46:30 AM

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S. A. Balashev, P. Noterdaeme. Molecular hydrogen in absorption at high redshifts. Experimental Astronomy, 2022, ⟨10.1007/s10686-022-09843-y⟩. ⟨insu-03748289⟩

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