112 citations · 569 across the 17 of their papers we have counts for
9 papers · 1 filter
UVES radial velocity accuracy from asteroid observations. Implications for the fine structure constant variability
P. Molaro, S. A. Levshakov, S. Monai +4
High resolution observations of the asteroids Iris and Juno have been performed by means of the UVES spectrograph at the ESO VLT to obtain the effective accurac y of the spectrogra…
Extinction and metal column density of HI regions up to redshift z~2
G. Vladilo, M. Centurion, S. A. Levshakov +4
We used the photometric database of the Sloan Digital Sky Survey (SDSS) to estimate the reddening of 13 SDSS quasars selected on the basis of the presence of zinc absorption lines…
Exploring variations in the fundamental constants with ELTs: The CODEX spectrograph on OWL
Paolo Molaro, Michael T. Murphy, Sergei Levshakov
Cosmological variations in the fine structure constant, alpha, can be probed through precise velocity measurements of metallic absorption lines from intervening gas clouds seen in…
Early stages of Nitrogen enrichment in galaxies: Clues from measurements in damped Lyman alpha systems
M. Centurion, P. Molaro, G. Vladilo +3
We present 4 new measurements of nitrogen abundances and one upper limit in damped Lyman alpha absorbers (DLAs) obtained by means of high resolution (FWHM \~ 7 km/s) UVES/VLT spect…
Metal abundances and kinematics of quasar absorbers - II. Absorption systems toward Q0347-3819 and APM BR J0307-4945
S. A. Levshakov, I. I. Agafonova, S. D'Odorico +2
Detailed Monte Carlo Inversion analysis of the spectral lines from three Lyman limit systems (LLS) [N(HI) > 10^{17} cm^-2] and nine lower N(HI) systems [2 10^{14} < N(HI) < 2 10^{1…
Metal abundances and kinematics of quasar absorbers.- I. Absorption systems toward J2233-606
S. A. Levshakov, I. I. Agafonova, M. Centurion +1
The metal line profiles of different ions observed in high HI column density systems [N(HI) > 10^{16} cm^{-2}] in quasar spectra can be used to constrain the ionization structure a…