Publications (81)
Spatial and temporal variations of fundamental constants
S. A. Levshakov, I. I. Agafonova, P. Molaro +1
Metal-rich absorbers at high redshifts: abundance patterns
S. A. Levshakov, I. I. Agafonova, P. Molaro +2
Molecular hydrogen abundance in the dust-free damped Ly-alpha galaxy at z = 3.4
S. A. Levshakov, P. Molaro, M. Centurion +3
Torsion-rotational transitions in methanol as a probe of fundamental physical constants -- electron and proton masses
J. S. Vorotyntseva, S. A. Levshakov
Testing the variation of fundamental constants by astrophysical methods: overview and prospects
S. A. Levshakov
Spectral shape of the UV ionizing background and OVI absorbers at z ~ 1.5 towards HS0747+4259
D. Reimers, I. I. Agafonova, S. A. Levshakov +5
A rotating helical filament in the L1251 dark cloud
S. A. Levshakov, D. Reimers, C. Henkel
Searching for chameleon-like scalar fields with the ammonia method. II. Mapping of cold molecular cores in NH3 and HC3N lines
S. A. Levshakov, A. V. Lapinov, C. Henkel +4
Spectral energy distribution of the metagalactic ionizing radiation field from QSO absorption spectra
I. I. Agafonova, M. Centurion, S. A. Levshakov +1
The UVES Large Program for Testing Fundamental Physics II: Constraints on a Change in μ Towards Quasar HE 0027-1836
H. Rahmani, M. Wendt, R. Srianand +14
The broad OVI absorber at z = 3.02 toward CTQ 325
S. A. Levshakov, S. D'Odorico, I. I. Agafonova +1
Testing the variability of the proton-to-electron mass ratio from observations of methanol in the dark cloud core L1498
M. DaprÃ, C. Henkel, S. A. Levshakov +6
Fundamental constants and high resolution spectroscopy
P. Bonifacio, H. Rahmani, J. B. Whitmore +14
Nitrogen-deficient and iron-rich associated absorbers with oversolar metallicities towards the quasar HE0141-3932
S. A. Levshakov, I. I. Agafonova, D. Reimers +3
Star-forming regions of the Aquila rift cloud complex. I. NH3 tracers of dense molecular cores
S. A. Levshakov, C. Henkel, D. Reimers +4
Constraints on the electron-to-proton mass ratio variation at the epoch of reionization
S. A. Levshakov, M. G. Kozlov, I. I. Agafonova
The UVES Large Program for Testing Fundamental Physics: I Bounds on a change in alpha towards quasar HE 2217-2818
P. Molaro, M. Centurion, J. B. Whitmore +14
VLT/UVES constraints on the carbon isotope ratio 12C/13C at z=1.15 toward the quasar HE 0515-4414
S. A. Levshakov, M. Centurion, P. Molaro +1
UVES observations of QSO 0000-2620: Molecular hydrogen abundance in the damped Ly-alpha system at z_abs = 3.3901
S. A. Levshakov, P. Molaro, M. Centurion +3
Microwave and submillimeter molecular transitions and their dependence on fundamental constants
M. G. Kozlov, S. A. Levshakov
A new constraint on cosmological variability of the proton-to-electron mass ratio
S. A. Levshakov, M. Dessauges-Zavadsky, S. D'Odorico +1
Extinction and metal column density of HI regions up to redshift z~2
G. Vladilo, M. Centurion, S. A. Levshakov +4
A new measure of Delta alpha/alpha at redshift z = 1.84 from very high resolution spectra of Q1101-264
S. A. Levshakov, P. Molaro, S. Lopez +5
Hyperfine structure of methanol lines at 25 GHz
J. S. Vorotyntseva, S. A. Levshakov
How accurately can the deuterium abundance be determined ?
S. A. Levshakov, W. H. Kegel, F. Takahara
H2, D/H and the CMBR Temperature at z = 3.025 Toward QSO 0347-3819
S. A. Levshakov, P. Molaro, M. Dessauges-Zavadsky +1
Searching for chameleon-like scalar fields with the ammonia method
S. A. Levshakov, P. Molaro, A. V. Lapinov +3
Sensitivity of the H3O+ inversion-rotational spectrum to changes in m_e/m_p
M. G. Kozlov, S. A. Levshakov
VLT/Uves Observations of the Dla at Z=3.39 towards QSO 0000-2621
P. Molaro, P. Bonifacio, M. Centurion +3
Detection of molecular hydrogen at z=1.15 toward HE 0515-4414
D. Reimers, R. Baade, R. Quast +1
[CI], [CII] and CO emission lines as a probe for alpha variations at low and high redshifts
S. A. Levshakov, K. -W. Ng, C. Henkel +1
On spatial variations of the electron-to-proton mass ratio in the Milky Way
S. A. Levshakov, P. Molaro, M. G. Kozlov
New aspects of absorption line formation in intervening turbulent clouds - III. The inverse problem in the study of H+D profiles
S. A. Levshakov, W. H. Kegel, F. Takahara
36 GHz methanol lines from nearby galaxies: maser or quasi-thermal emission?
P. Humire, C. Henkel, Y. Gong +12
Sensitivity of microwave and FIR spectra to variation of fundamental constants
M. G. Kozlov, A. V. Lapinov, S. A. Levshakov
Early stages of Nitrogen enrichment in galaxies: Clues from measurements in damped Lyman alpha systems
M. Centurion, P. Molaro, G. Vladilo +3
What causes the Ly-alpha forest, clouds or large-scale velocity fields ?
W. H. Kegel, S. A. Levshakov
Photoionized OVI absorbers toward the bright QSO HE 0515-4414
S. A. Levshakov, I. I. Agafonova, D. Reimers +1
Limits on the spatial variations of the electron-to-proton mass ratio in the Galactic plane
S. A. Levshakov, D. Reimers, C. Henkel +4
Transition frequency shifts with fine structure constant variation for Fe II: Breit and core-valence correlation correction
S. G. Porsev, K. V. Koshelev, I. I. Tupitsyn +3
A Reverse Monte Carlo study of H+D Lyman alpha absorption from QSO spectra
S. A. Levshakov, W. H. Kegel, F. Takahara
Extremely metal-poor Lyman limit system at z = 2.917 toward the quasar HE 0940-1050
S. A. Levshakov, I. I. Agafonova, M. Centurion +1
Ammonia as a Tracer of Fundamental Constants
C. Henkel, K. M. Menten, M. T. Murphy +5
Most precise single redshift bound to Delta alpha/alpha
S. A. Levshakov, M. Centurion, P. Molaro +4
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
Metal abundances and kinematics of quasar absorbers.- I. Absorption systems toward J2233-606
S. A. Levshakov, I. I. Agafonova, M. Centurion +1
Kinetic temperature of massive star-forming molecular clumps measured with formaldehyde IV. The ALMA view of N113 and N159W in the LMC
X. D. Tang, C. Henkel, K. M. Menten +25
Fundamental physical constants at low and high redshifts
S. A. Levshakov
Methanol isotopologues as a probe for spatial and temporal variations of the electron-to-proton mass ratio
J. S. Vorotyntseva, M. G. Kozlov, S. A. Levshakov
Most precise single redshift bound to the variability of the fine-structure constant
S. A. Levshakov, M. Centurion, P. Molaro +4
A new approach for testing variations of fundamental constants over cosmic epochs using FIR fine-structure lines
S. A. Levshakov, D. Reimers, M. G. Kozlov +2
Searching for Chameleon-like Scalar Fields
S. A. Levshakov, P. Molaro, M. G. Kozlov +5
Mid- and far-infrared fine-structure line sensitivities to hypothetical variability of the fine-structure constant
M. G. Kozlov, S. G. Porsev, S. A. Levshakov +2
On metal abundances in QSO absorbers
S. A. Levshakov
On the deuterium abundance at z_a = 3.514 towards APM 08279+5255
S. A. Levshakov, I. I. Agafonova, W. H. Kegel
Star-forming regions of the Aquila rift cloud complex. II. Turbulence in molecular cores probed by NH3 emission
S. A. Levshakov, C. Henkel, D. Reimers +1
Indications of electron-to-proton mass ratio variations in the Galaxy. III. 0.6mm methanol lines toward SgrB2(N) and Orion-KL
J. S. Vorotyntseva, S. A. Levshakov
Fluctuations of the intergalactic ionization field at redshift z ~ 2
I. I. Agafonova, S. A. Levshakov, D. Reimers +2
First measurement of Mg isotope abundances at high redshifts and accurate estimate of Delta alpha/alpha
I. I. Agafonova, P. Molaro, S. A. Levshakov +1
Argon and Silicon abundances in the damped Ly-alpha system I Zw 18
S. A. Levshakov, W. H. Kegel, I. I. Agafonova
Spectroscopic Shifts in Deuterated Methanol Induced by Variation of me/mp
J. S. Vorotyntseva, S. A. Levshakov, M. G. Kozlov
The Gunn-Peterson effect and the Lyman alpha forest
S. A. Levshakov, W. H. Kegel
Hyperfine structure of the methanol molecule as traced by Class I methanol masers
I. I. Agafonova, O. S. Bayandina, Y. Gong +9
HE 0141-3932: a bright QSO with an unusual emission line spectrum and associated absorption
D. Reimers, E. Janknecht, C. Fechner +3
UVES radial velocity accuracy from asteroid observations. Implications for the fine structure constant variability
P. Molaro, S. A. Levshakov, S. Monai +4
Probing the electron-to-proton mass ratio gradient in the Milky Way with class I methanol masers
S. A. Levshakov, I. I. Agafonova, C. Henkel +4
An upper limit to the variation in the fundamental constants at redshift z = 5.2
S. A. Levshakov, F. Combes, F. Boone +3
VLT/UVES constraints on the cosmological variability of the fine-structure constant
S. A. Levshakov, M. Centurion, P. Molaro +1
Sensitivity of microwave spectra of deuterated ammonia to variation of electron-to-proton mass ratio
M. G. Kozlov, A. V. Lapinov, S. A. Levshakov
Methanol as a tracer of fundamental constants
S. A. Levshakov, M. G. Kozlov, D. Reimers
Fine-structure transitions as a tool for studying variation of alpha at high redshifts
S. A. Levshakov, M. G. Kozlov
Testing the weak equivalence principle by differential measurements of fundamental constants in the Magellanic Clouds
S. A. Levshakov, K. -W. Ng, C. Henkel +4
The cosmic microwave background radiation temperature at z = 3.025 toward QSO 0347--3819
P. Molaro, S. A. Levshakov, M. Dessauges-Zavadsky +1
Indication of the electron-to-proton mass ratio variation within the Galaxy
J. S. Vorotyntseva, S. A. Levshakov
Indications of electron-to-proton mass ratio variations in the Galaxy. II. 3 mm methanol lines toward Sgr B2(N) and (M)
J. S. Vorotyntseva, S. A. Levshakov, C. Henkel
Molecular hydrogen, deuterium and metal abundances in the damped Ly-alpha system at z = 3.025 toward QSO 0347-3819
S. A. Levshakov, M. Dessauges-Zavadsky, S. D'Odorico +1
Spectral shape of the UV ionizing background and HeII absorption at redshifts 1.8 < z < 2.9
I. I. Agafonova, S. A. Levshakov, D. Reimers +4
Limits on the space-time variations of fundamental constants
S. A. Levshakov, C. Henkel, D. Reimers +1
Quasar spectral energy distribution in EUV restored from associated absorbers: indications to the HeII opacity of the quasar accretion disk wind
S. A. Levshakov, I. I. Agafonova, D. Reimers +2
Acetaldehyde as a molecule for testing variations of electron-to-proton mass ratio
J. S. Vorotyntseva, S. A. Levshakov, M. G. Kozlov
Searching for spatial variations of alpha^2/mu in the Milky Way
S. A. Levshakov, P. Molaro, D. Reimers