Preprints and publications of the Quasars and Cosmology Group

• 2003
• 2002
• 2001
• 2000
• 1999
• 1998
• 1997
• 1996
• 1995

2003

• Extremely metal-poor Lyman limit system at z=2.917 toward the quasar HE 0940-1050 [astro-ph/0210619]

  S.A. Levshakov, I.I. Agafonova, M. Centurion, P. Molaro

  2003, Astron. Astrophys. (in press)

• Metal abundances and kinematics of quasar absorbers - II. Absorption systems toward Q0347-3819 and APM BR J0307-4945 [astro-ph/0209328]

  S.A. Levshakov, I.I. Agafonova, S. D'Odorico, A.M. Wolfe, M. Dessauges-Zavadsky

  2003, Astrophys. J. 582, 596-614.

2002

• On metal abundances in QSO absorbers [astro-ph/0211204]

  S.A. Levshakov

  2002, in: C. Charbonnel, D. Schaerer and G. Meynet (eds.), CNO in the Universe, ASP Conf. Ser. (in press)

• Does the proton-to-electron mass ratio vary in the course of cosmological evolution? [astro-ph/0210299]

  A.Ivanchik, P. Petitjean, E. Rodriguez, D. Varshalovich

  2002, Proceedings of JENAM Workshop on Varying Fundamental Constants (Porto, 4th September 2002) (accepted)

• A new constraint on cosmological variability of the proton-to-electron mass ratio (170 K) [astro-ph/0106194]

  S.A. Levshakov, M. Dessauges-Zavadsky, S. D'Odorico, P. Molaro

  2002, Mon. Not. R. astr. Soc., 333, 373

• Molecular hydrogen, deuterium, and metal abundances in the damped Ly-alpha system at z_abs=3.025 toward Q0347-3819 (1111 K) [astro-ph/0105529]

  S.A. Levshakov, M. Dessauges-Zavadsky, S. D'Odorico, P. Molaro

  2002, Astrophys. J., 565, 696

• Metal abundances and kinematics of quasar absorbers. - I. Absorption systems toward J2233-606 (620 K) [astro-ph/0201101]

  S.A. Levshakov, I.I. Agafonova, M. Centurion, I.E. Mazets

  2002, Astron. Astrophys., 383, 813

• The cosmic microwave background radiation temperature at z=3.025 toward QSO 0347-3819 (260 K) [astro-ph/0111589]

  P. Molaro, S.A. Levshakov, M. Dessauges-Zavadsky, S. D'Odorico

  2002, Astron. Astrophys., 381, L64

• H2, D/H and the CMBR temperature at z=3.025 toward QSO 0347-3819 [astro-ph/0201043]

  S.A. Levshakov, P. Molaro, M. Dessauges-Zavadsky, S. D'Odorico

  2002, in the Proceed. the 5th RESCEU International Symp. on New Trends in Theoretical and Observational Cosmology (13-16 November, 2001: Tokyo, Japan)

• Do the fundamental constants vary in the course of the cosmological evolution? [astro-ph/0111429]

  A. Ivanchik, E. Rodriguez, P. Petitjean, D. Varshalovich

  2002, Astronomy Letters 28, 423

2001

• Effects of possible deviations of fundamental phyical constants on primordial nucleosynthesis (106 K)

  A.V. Ivanchik, A.V. Orlov, D.A. Varshalovich

  2001, Astronomy Letters 27, 615

• Problems of cosmological variability of fundamental physical constants (98 K)

  D.A. Varshalovich, A.Y. Potekhin, A.V. Ivanchik

  2001, Physica Scripta T95, 76

• HD molecular lines in an absorption system at redshift 2.3377 (112 K) [astro-ph/0107310]

  D. Varshalovich, A. Ivanchik, P. Petitjean, R. Srianand, C. Ledoux

  2001, Astronomy Letters 27, 683

• Argon, silicon and iron abundances in the damped Ly-alpha system I Zw 18 [astro-ph/0011513]

  S.A. Levshakov, W.H. Kegel, I.I. Agafonova

  2001, Astron. Astrophys. 373, 836

• UVES observations of QSO 0000-2620: Argon and Phosphorus abundances in the dust-free damped Ly-alpha system at z_abs= 3.3901 (227 K) [astro-ph/0010434]

  P. Molaro, S.A. Levshakov, S. D'Odorico, P. Bonifacio, M. Centurion

  2001, Astrophys. J., 549, 90

• Puzzle of the constancy of fundamental constants (63 K) [physics/0004068]

  D.A. Varshalovich, A.Y. Potekhin, A.V. Ivanchik

  2001, Comments on At. Mol. Phys. (in press)

2000

• Argon and Silicon abundances in the damped Ly-alpha system IZw18 [astro-ph/0011513]

  S.A. Levshakov, W.H. Kegel, I.I. Agafonova

  2000, Astron. Astrophys. (submitted)

• Molecular hydrogen abundance in the dust-free damped Ly-alpha galaxy at z=3.4 [astro-ph/0011470]

  S.A. Levshakov, P. Molaro, M. Centurion, S. D'Odorico, P. Bonifacio, G. Vladilo

  2000, to appear in Proceed. ESO/ST-ECF/STScI Workshop on Deep Fields, held in Garching, 9-12 October 2000

• UVES observations of QSO 0000-2620: Argon and Phosphorus abundances in the dust-free damped Ly-alpha system at z_abs= 3.3901 [astro-ph/0010434]

  P. Molaro, S.A. Levshakov, S. D'Odorico, P. Bonifacio, M. Centurion
  

  2000, Astrophys. J., in press

• On the measurement of kinetic temperature in high redshift galactic halos [astro-ph/9905123]

  S.A. Levshakov, W.H. Kegel

  2000, in: Building galaxies: from the primordial universe to the present, eds. F. Hammer, T.X. Thuan, V. Cayatte, B. Guideroni, J. Tran Than Van (World Scientific, Singapore) p. 431

• UVES observations of QSO 0000-2620: Molecular hydrogen abundance in the damped Ly-alpha system at z=3.3901 (184 K) [astro-ph/0007472]

  S.A. Levshakov, P. Molaro, M. Centurion, S. D'Odorico, P. Bonifacio, G. Vladilo

  2000, Astron. Astrophys., 361, 803

• Monte Carlo inversion of hydrogen and metal lines from QSO absorption spectra (317 K) [astro-ph/0003078]

  S.A. Levshakov, I.I. Agafonova, W.H. Kegel

  2000, Astron. Astrophys., 360, 833

• Testing cosmological variability of fundamental constants (101 K) [physics/0004062]

  D.A. Varshalovich, A.Y. Potekhin, A.V. Ivanchik

  2000, in: R.W. Dunford, D.S. Gemmel, E.P. Kanter, B. KrĪssig, S.H. Southworth, L. Young (eds.) X-ray and Inner-Shell Processes (Proc. 18th International Conf., Argonne, August 1999) AIP Conf. Proc. (AIP, Melville) vol. 506, p. 503

• Deuterium to hydrogen towards QSO 1009+2956 from a mesoturbulent model [astro-ph/9812114]

  S.A. Levshakov, D. Tytler, S. Burles

  2000, Astron. Astrophys. Trans. 19, 385

• Space-time distributions of QSO absorption systems (705 K)

  A.D. Kaminker, A.I. Ryabinkov, D.A. Varshalovich

  2000, Astron. & Astrophys. (accepted)

• The deuterium abundance in QSO absorption systems: a mesoturbulent approach [astro-ph/0001406]

  S.A. Levshakov

  2000, Proceedings of the IAU Symposium 198 "The light elements and their evolution" (November 22-27, 1999, Natal, Brazil)

• On the deuterium abundance at z_a=3.514 towards APM 08279+5255 (272 K) [astro-ph/9911261]

  S.A. Levshakov, I.I. Agafonova, W.H. Kegel

  2000, Astron. & Astrophys. 355, L1

• Primordial nucleosynthesis: effects of possible variations of fundamental physical constants

  A.V. Orlov, A.V Ivanchik, D.A. Varshalovich

  2000, Astron. & Astrophys. Transactions, 19, 375

• A model for the molecular accretion disk and H2O maser in the nucleus of the galaxy NGC4258 (318 K)

  N.S. Babkovskaya, D.A. Varshalovich

  2000, Astronomy Letters, 26, 144

1999

• Two fields of astrophysical studies: Fundamental constants and neutron stars (55 K)

  D.A. Varshalovich, D.G. Yakovlev, A.Y. Potekhin, A.V. Ivanchik

  1999, in: Zh.I. Alferov (ed.), Ioffe Institute: 1918-1998. Development and Research Activities (St. Petersburg, 1999) p. 200

• Measurability of kinetic temperature from metal absorption-line spectra formed in chaotic media (355 K) [astro-ph/9809166]

  S.A. Levshakov, F. Takahara, I.I. Agafonova

  1999, Astrophys. J. 517, 609

• New aspects of absorption-line formation in intervening turbulent clouds - III. The inverse problem in the study of H+D profiles (840 K) [astro-ph/9710122]

  S.A. Levshakov, W.H. Kegel, F. Takahara

  1999, Mon. Not. R. astr. Soc. 302, 707

• The fine-structure constant: a new observational limit on its cosmological variation and some theoretical consequences (117 K) [astro-ph/9810166]

  A.V. Ivanchik, A.Y. Potekhin, D.A. Varshalovich

  1999, Astron. & Astrophys. 343, 439

1998

• Testing cosmological variability of the proton-to-electron mass ratio using the spectrum of PKS 0528-250 (149 K) [astro-ph/9804116]

  A.Y. Potekhin, A.V. Ivanchik, D.A. Varshalovich, K.M. Lanzetta, J.A. Baldwin, G.M. Williger, R.F. Carswell

  1998, Astrophys. J., 505, 523

1997

• What causes the Ly-alpha forest, clouds or large-scale velocity fields? (115 K) [astro-ph/9708063]

  W.H. Kegel, S.A. Levshakov

  1997, in Proc. of 13th IAP Colloquium "Structure and Evolution of the IGM from QSO Absorption Line Systems" (Paris, Editions Frontieres, 1997) p.414

• How accurately can the deuterium abundance be determined? (69 K) [astro-ph/9708064]

  S.A. Levshakov, W.H. Kegel, and F. Takahara

  1997, in Proc. of 13th IAP Colloquium "Structure and Evolution of the IGM from QSO Absorption Line Systems" (Paris, Editions Frontieres, 1997) p.351

• Testing cosmological variations of fundamental physical constants by analysis of quasar spectra (38 K) [astro-ph/9607098]

  D.A. Varshalovich, A.Y. Potekhin, A.V. Ivanchik, V.E. Panchuk, K.M.Lanzetta

  1997, in: I.M. Dremin, A.D. Semikhatov (eds.), 2nd Int. Sakharov Conf. on Physics (Moskow, May 19-26, 1996) (World Scientific, Singapore) p.178.

1996

• Absorption Systems in the Spectra of the Quasars HS 1946+76, S5 0014+81, and S4 0636+68: New Bounds on Cosmological Change in the Fine-Structure Constant

  D. A. Varshalovich, V. E. Panchuk, and A. V. Ivanchik

  1996, Astronomy Letters, Vol. 22, No. 1, p. 6

• Have the Masses of Molecules Changed during the Lifetime of the Universe?

  D. A. Varshalovich and A. Y. Potekhin

  1996, Astronomy Letters, Vol. 22, No. 1, p. 1

1995

• Cosmological variability of fundamental physical constants by analysis of quasar spectra (69 K)

  D.A. Varshalovich, A.Y. Potekhin

  1995, Space Sci. Rev., 74, 259