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Evolution of the cosmological mass density of neutral gas from Sloan Digital Sky Survey II - Data Release 7
We present the results of a search for damped Lyman-alpha (DLA) systems in the Sloan Digital Sky Survey II (SDSS), Data Release 7. We use a fully automatic procedure to identify DLAs and derive their
Probing the cosmological variation of the fine - structure constant: Results based on VLT - UVES sample
Development of fundamental physics relies on the constancy of various fundamental quantities such as the fine- structure constant. Detecting or constraining the possible time variations of these
Molecular hydrogen in high-redshift Damped Lyman-alpha systems: The VLT/UVES database
Aims. We present the current status of ongoing searches for molecular hydrogen in high-redshift (1.8 z abs ≤ 4.2) Damped Lyman- α systems (DLAs) capitalising on observations performed with the ESO
Velocity-metallicity correlation for high-z DLA galaxies: evidence of a mass-metallicity relation?
We used our database of VLT-UVES quasar spectra to build up a sample of 70 Damped Lyman- α (DLA) or strong sub-DLA systems with total neutral hydrogen column densities of $\log N($H i$)\ga 20$ and
The Very Large Telescope Ultraviolet and Visible Echelle Spectrograph survey for molecular hydrogen in high‐redshift damped Lyman α systems
We have searched for molecular hydrogen in damped Lyman α (DLA) and sub-DLA systems at high redshift (z abs > 1.8) using the Ultraviolet and Visible Echelle Spectrograph (UVES) at the Very Large
Limits on the time variation of the electromagnetic fine-structure constant in the low energy limit from absorption lines in the spectra of distant quasars.
A detailed many-multiplet analysis performed on a new sample of Mg ii systems observed in high quality quasar spectra obtained using the Very Large Telescope finds that it is the time variation of alpha that forms the strongest constraint obtained based on high redshift quasar absorption line systems.
Dust-depletion sequences in damped Lyman-α absorbers - A unified picture from low-metallicity systems to the Galaxy
We study metal depletion due to dust in the interstellar medium (ISM) to infer the properties of dust grains and characterize the metal and dust content of galaxies down to low metallicity and inte
The VLT-UVES survey for molecular hydrogen in high-redshift damped Lyman α systems: physical conditions in the neutral gas
We study the physical conditions in damped Lyman α systems (DLAs), using a sample of 33 systems towards 26 quasi-stellar objects (QSOs) acquired for a recently completed survey of H2 by Ledoux,
A new constraint on the time dependence of the proton-to-electron mass ratio - Analysis of the Q 0347-383 and Q 0405-443 spectra
A new limit on the possible cosmological variation of the proton-to-electron mass ratio $\mu=m_{\rm p}/m_{\rm e}$ is estimated by measuring wavelengths of H 2 lines of Lyman and Werner bands from two
The sizes and kinematic structure of absorption systems towards the lensed quasar APM08279+5255
We have obtained spatially resolved spectra of the z em = 3.911 triply imaged QSO APM08279+5255 using the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST). We