Molecular hydrogen in absorption at high redshifts. Science cases for CUBES

Abstract

Absorption lines from molecular hydrogen (${\mathrm{H}}_2$) in the spectra of background sources are a powerful probe of the physical conditions in intervening cold neutral medium. At high redshift, $z>2$, ${\mathrm{H}}_2$ 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 ${\mathrm{H}}_2$ observations at high-z: probing the physical conditions in the cold phase of regular galaxies and outflowing gas from active galactic nucleus.

arXiv comment16 pages, 5 figures, accepted for publication in Experimental Astronomy, CUBES Special Issue

References in corpus (56)

• The Sloan Digital Sky Survey: Technical Summary
• X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope
• Massive Molecular Outflows and Evidence for AGN Feedback from CO Observations
• Fast Molecular Outflows in Luminous Galaxy Mergers: Evidence for Quasar Feedback from Herschel
• Column density distribution and cosmological mass density of neutral gas: Sloan Digital Sky Survey-III Data Release 9
• The VLT-UVES survey for molecular hydrogen in high-redshift damped Lyman-alpha systems
• A FUSE Survey of Interstellar Molecular Hydrogen in the Small and Large Magellanic Clouds
• Molecular hydrogen in high-redshift Damped Lyman-alpha systems: The VLT/UVES database
• The evolution of the Cosmic Microwave Background Temperature: Measurements of TCMB at high redshift from carbon monoxide excitation
• The VLT-UVES survey for molecular hydrogen in high-redshift damped Lyman-alpha systems: Physical conditions in the neutral gas
• The First Positive Detection of Molecular Gas in a GRB Host Galaxy
• First detection of CO in a high-redshift DLA
• A translucent interstellar cloud at z=2.69: CO, H2 and HD in the line-of-sight to SDSS J123714.60+064759.5
• The UVES Large Program for Testing Fundamental Physics II: Constraints on a Change in μ Towards Quasar HE 0027-1836
• The host galaxies and explosion sites of long-duration gamma ray bursts: Hubble Space Telescope near-infrared imaging
• The density, the cosmic microwave background, and the proton-to-electron mass ratio in a cloud at redshift 0.9
• Molecular Hydrogen in the Damped Lyman-alpha System towards GRB 120815A at z=2.36
• A connection between extremely strong Damped Lyman-alpha Systems and Lyman-alpha Emitting Galaxies at small impact parameters
• Diffuse molecular gas at high redshift: Detection of CO molecules and the 2175 Å dust feature at z=1.64
• The elemental abundance pattern in a galaxy at z=2.626
• Deep Learning of Quasar Spectra to Discover and Characterize Damped Lya Systems
• Thermal Phases of the Neutral Atomic Interstellar Medium -- from Solar Metallicity to Primordial Gas
• Discovery of a Perseus-like cloud in the early Universe: HI-to-H2 transition, carbon monoxide and small dust grains at zabs=2.53 towards the quasar J0000+0048
• Excitation mechanisms in newly discovered H2-bearing Damped Lyman-alpha clouds: systems with low molecular fractions
• CO-dark molecular gas at high redshift: very large H${}_2$ content and high pressure in a low metallicity damped Lyman-alpha system
• Understanding Physical Conditions in High Redshift Galaxies through C I Fine Structure Lines: Data and Methodology
• Molecular Hydrogen Absorption in the z= 1.97 Damped Lyman alpha Absorption system toward QSO 0013-004
• Physical conditions in the neutral interstellar medium at z=2.43 toward Q2348-011
• Constraints on changes in the proton-electron mass ratio using methanol lines
• Evidence for diffuse molecular gas and dust in the hearts of gamma-ray burst host galaxies
• Search for a drifting proton--electron mass ratio from H${}_2$
• VLT/UVES observations of extremely strong intervening damped Lyman-alpha systems: Molecular hydrogen and excited carbon, oxygen and silicon at log N(HI)=22.4
• Molecular hydrogen absorption systems in Sloan Digital Sky Survey
• Metallicities, dust and molecular content of a QSO-Damped Lyman-α system reaching log N (H i) = 22: An analog to GRB-DLAs
• Spotting high-z molecular absorbers using neutral carbon: Results from a complete spectroscopic survey with the VLT
• A Far Ultraviolet Spectroscopic Explorer Survey of Interstellar Molecular Hydrogen in the Galactic Disk
• Dust/gas correlations from Herschel Observations
• HD/H2 Molecular Clouds in the Early Universe: The Problem of Primordial Deuterium
• Constraining the H${}_2$ column density distribution at z$\sim$3 from composite DLA spectra
• On the mass-metallicity relation, velocity dispersion and gravitational well depth of GRB host galaxies
• X-shooter observations of strong H${}_2$-bearing DLAs at high redshift
• Dust Biasing of Damped Lyman Alpha Systems: a Bayesian Analysis
• Molecular gas and star formation in an absorption-selected galaxy: Hitting the bull's eye at z = 2.46
• Direct Evidence of Cold Gas in DLA 0812+32B
• The Magellan Uniform Survey of Damped Lyman alpha Systems II: Paucity of Strong Molecular Hydrogen Absorption
• Constraint on a cosmological variation in the proton-to-electron mass ratio from electronic CO absorption
• The effect of dust bias on the census of neutral gas and metals in the high-redshift Universe due to SDSS-II quasar colour selection
• Proximate Molecular Quasar Absorbers: Excess of damped H2 systems at zabs~zQSO in SDSS DR14
• Constraint on a variation of the proton-to-electron mass ratio from H2 absorption towards quasar Q2348-011
• Physical conditions in diffuse interstellar medium of local and high redshift galaxies: measurements based on excitation of H${}_2$ rotational and CI fine-structure levels
• HD molecules at high redshift: cosmic-ray ionization rate in the diffuse interstellar medium
• Analysis of carbon monoxied absorption at z=2.5 to constrain variation of the proton-to-electron mass ratio
• Down-the-barrel observations of a multiphase quasar outflow at high redshift: VLT/X-shooter spectroscopy of the proximate molecular absorber at z=2.631 towards SDSS J001514+184212
• H${}_2$/HD molecular data for analysis of quasar spectra in search of varying constants
• Nature of the DLA towards Q0528-250: High pressure and strong UV field revealed by excitation of CI, H2 and SiII
• Remarkably high mass and high velocity dispersion of molecular gas associated with a regular, absorption-selected type-I quasar

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