Prof. Hum Chand

Prof. Hum Chand

Professor Department of Physics and Astronomical Science

Publications

  1. Intranight optical variability of TeV blazars with parsec-scale jets dominated by slow-moving radio knots Negi, Vibhore ; Gopal-Krishna ; Chand, Hum ; Britzen, Silke , 2023, MNRAS Letters, in press, ;eprint arXiv:2304.11187

  2. Intranight Optical Variability of blazars and Radio-quiet Quasars using the ZTF survey Negi, Vibhore; Gopal-Krishna; Joshi, Ravi; Chand, Hum; Wiita, Paul J.; Navaneeth, P. K.; Singh, Ravi S., 2023, MNRAS,522, 5588N ;eprint arXiv:2304.11187

  3. The transience and persistence of high optical polarization state in beamed radio quasars Chand, Krishan and Gopal-Krishna and Omar, Amitesh and Chand, Hum and Bisht, P.~S.,2023, PASA, 40, 6C ;eprint arXiv:2301.06159

  4. Evidence of underdeveloped torus and broad-line region of weak emission line quasars based on their spectral energy distribution Kumar, Ritish and Chand, Hum and Joshi, Ravi, 2023, MNRAS, 519, 3656K ;eprint arXiv:2212.06179

  5. Probable low-frequency quasi-periodic oscillations in blazars from the ZTF survey; Banerjee, Anuvab and Negi, Vibhore and Joshi, Ravi and Kumar, Nagendra and Wiita, Paul J. and Chand, Hum and Rawat, Nikita and Wu, Xue-Bing and Ho, Luis C. ;eprint arXiv:2210.07266

  6. Intranight optical variability of low-mass active galactic nuclei: a pointer to blazar-like activity; Gopal-Krishna; Chand, Krishan; Chand, Hum; Negi, Vibhore; Mishra, Sapna; Britzen, S.; Bisht, P. S., 2023,MNRAS, 518L, 13G, eprint arXiv:2210.05186

  7. Evidence of jet-induced optical microvariability in radio-loud narrow-line Seyfert 1 galaxies; Ojha, Vineet; Jha, Vivek Kumar; Chand, Hum ; Singh, Veeresh, 2022, MNRAS, 514, 5607O, eprint arXiv:2206.04641

  8. Optical flux and colour variability of blazars in the ZTF survey; Negi, Vibhore; Joshi, Ravi; Chand, Krishan; Chand, Hum; Wiita, Paul; Ho, Luis C.; Singh, Ravi S. 2022, MNRAS, 510, 1791N, eprint arXiv:2112.00790

  9. Intranight variability of UV emission from powerful blazars; Chand, Krishan; Gopal-Krishna; Omar, Amitesh; Chand, Hum; Mishra, Sapna; Bisht, P. S.; Britzen, S., 2022MNRAS, Letter,511L,13C eprint arXiv:2112.04516

  10. Accretion disc sizes from continuum reverberation mapping of AGN selected from the ZTF survey; Jha, Vivek Kumar,Joshi, Ravi,Chand, Hum et al. Monthly Notices of the Royal Astronomical Society: 2022, Volume 511,3005, eprint arXiv:2109.05036

  11. A comparative study of the physical properties for a representative sample of Narrow and Broad-line Seyfert galaxies; Jha, Vivek Kumar; Chand, Hum; Ojha, Vineet; Omar, Amitesh; Rastogi, Shantanu, 2022, MNRAS,510,4379J, eprint arXiv:2112.09150

  12. VizieR Online Data Catalog: X-ray obs. of narrow- and broad-line Seyfert 1 gal. (Ojha et al, 2020); Ojha, V.; Chand, H.; Dewangan, G. C.; Rakshit, S. 2021yCat..18960095O

  13. A search for blazar activity in broad-absorption-line quasars.; Mishra-Sapna, Gopal-Krishna, Chand-Hum et al. Monthly Notices of the Royal Astronomical Society: Letters, 2021, Volume 507, Issue 1, pp.L46-L51

  14. VizieR Online Data Catalog: MgII abs. toward SDSS QSOs with rotation measures.; Mishra-Sapna, Malik, S.,Chand, H.,Seshadri, T. R. et al. VizieR On-line Data Catalog: J/ApJ/890/132. Originally published in: 2020ApJ…890..132M

  15. Constraining the ratio of median pixel optical depth profile around z~4 quasars using the longitudinal proximity effect; Jalan, Priyanka,Chand, Hum,Srianand, Raghunathan et al.Jul 2021 Monthly Notices of the Royal Astronomical Society, Volume 505, Issue 1, pp.689-701

  16. Appearance versus disappearance of broad absorption line troughs in quasars; Mishra, Sapna,Vivek, M.,Chand, Hum et al.Jul 2021 Monthly Notices of the Royal Astronomical Society, Volume 504, Issue 3, pp.3187-3202

  17. Time delay lens modelling challenge; Ding, X.,Treu, T.,Birrer, S. et al.May 2021 Monthly Notices of the Royal Astronomical Society, Volume 503, Issue 1, pp.1096-1123

  18. VizieR Online Data Catalog: Lyman cont. luminosity of SDSS quasar pairs at z~3; Jalan, P.,Chand, H.,Srianand, R. et al.Mar 2021 VizieR On-line Data Catalog: J/ApJ/884/151. Originally published in: 2019ApJ...884..151J

  19. Intra-night optical variability of γ-ray detected narrow-line Seyfert1 galaxies; Ojha, Vineet,Chand, Hum,Gopal-Krishna et al. Mar 2021 Monthly Notices of the Royal Astronomical Society, Volume 501, Issue 3, pp.4110-4122

  20. VizieR Online Data Catalog: Strong MgII absorbers blazers; Mishra, S.,Chand, H.,Gopal-Krishna et al. Jan 2021 VizieR On-line Data Catalog: J/MNRAS/473/5154. Originally published in: 2018 MNRAS.473.5154M

  21. Properties of Broad and Narrow Line Seyfert galaxies selected from SDSS; Jha, Vivek Kumar,Chand, Hum,Ojha, Vineet et al.Dec 2020 Communications of the Byurakan Astrophysical Observatory (ComBAO), Volume 67, pp.219-226

  22. A Comparison of X-Ray Photon Indices among the Narrow- and Broad-line Seyfert 1 Galaxies; Ojha, Vineet,Chand, Hum,Dewangan, Gulab Chand et al.Jun 2020 The Astrophysical Journal, Volume 896, Issue 2, id.95, 22 pp. (2020)

  23. Comparative intranight optical variability of X-ray and γ-ray-detected narrow-line Seyfert 1 galaxies; Ojha, Vineet,Chand, Hum,Krishna, Gopal et al.Apr 2020 Monthly Notices of the Royal Astronomical Society, Volume 493, Issue 3, p.3642-3655

  24. Role of Intervening Mg II Absorbers on the Rotation Measure and Fractional Polarization of the Background Quasars; Malik, Sunil,Chand, Hum,Seshadri, T. R. et al.Feb 2020 The Astrophysical Journal, Volume 890, Issue 2, id.132, 11 pp. (2020)

  25. Are there broad absorption-line blazers?; Mishra, Sapna,Gopal-Krishna,Chand, Hum et al.Oct 2019 Monthly Notices of the Royal Astronomical Society: Letters, Volume 489, Issue 1, p.L42-L46

  26. Probing the Environment of High-z Quasars Using the Proximity Effect in Projected Quasar Pairs; Jalan, Priyanka,Chand, Hum,Srianand, Raghunathan et al.Oct 2019 The Astrophysical Journal, Volume 884, Issue 2, article id. 151, 21 pp. (2019)

  27. VizieR Online Data Catalog: VR CCD photometry of variable stars in the GC NGC 4147; Lata, S.,Pandey, A. K.,Pandey, J. C. et al. Sep 2019 VizieR On-line Data Catalog: J/AJ/158/51. Originally published in: 2019AJ.…158...51L

  28. VR CCD Photometry of Variable Stars in the Globular Cluster NGC 4147; Lata, Sneh,Pandey, A. K.,Pandey, J. C. et al.Jul 2019 The Astronomical Journal, Volume 158, Issue 1, article id. 51, 18 pp. (2019)

  29. C IV absorbers tracing cool gas in dense galaxy group/cluster environments Manuwal, Aditya,Narayanan, Anand,Muzahid, Sowgat et al., May 2019 Monthly Notices of the Royal Astronomical Society, Volume 485, Issue 1, p.30 46

  30. Intra-night optical monitoring of three γ-ray detected narrow-line Seyfert 1 galaxies; Ojha, Vineet,Krishna, Gopal,Chand, Hum et al., Mar 2019 Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 3, p.3036-3047

  31. Deceleration of C IV and Si IV Broad Absorption Lines in X-Ray Bright Quasar SDSS-J092345+512710 Joshi, Ravi,Srianand, Raghunathan,Chand, Hum et al., Jan 2019, The Astrophysical Journal, Volume 871, Issue 1, article id. 43, 7 pp. (2019)

  32. X-ray/UV/optical variability of NGC 4593 with Swift: reprocessing of X-rays by an extended reprocessor; McHardy, I. M.,Connolly, S. D.,Horne, K. et al., Nov 2018 Monthly Notices of the Royal Astronomical Society, Volume 480, Issue 3, p.2881-2897

  33. Investigating kpc-scale radio emission properties of narrow-line Seyfert 1 galaxies; Singh, Veeresh,Chand, Hum, et al. Oct 2018 Monthly Notices of the Royal Astronomical Society, Volume 480, Issue 2, p.1796-1818

  34. Polarimetric and spectroscopic study of radio-quiet weak emission line quasars ;Kumar, P.,Chand, H.,Srianand, R. et al. Oct 2018 Monthly Notices of the Royal Astronomical Society, Volume 479, Issue 4, p.5075-5082

  35. Kpc-scale radio-jets in narrow-line Seyfert 1 galaxies; Singh, V.,Chand, H.,Ishwara-Chandra, C. H. et al. Apr 2018 Revisiting narrow-line Seyfert 1 galaxies and their place in the Universe (NLS1-2018) 9-13 April 2018. Padova Botanical Garden, Italy.

  36. Intra-night optical variability properties of X-ray bright Narrow-line Seyfert 1 galaxies; Ojha, Vineet,Chand, Hum,Gopal-Krishna et al. Apr 2018 Bulletin de la Société Royale des Sciences de Liège, in Proceedings of the First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop, November 2016, held in Nainital, India, 87, 387-390

  37. Properties of Narrow line Seyfert 1 galaxies ;Rakshit, Suvendu,Stalin, Chelliah Subramonian,Chand, Hum et al. Apr 2018 Bulletin de la Société Royale des Sciences de Liège, in Proceedings of the First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop, November 2016, held in Nainital, India, 87, 379-386

  38. Transverse and Longitudinal proximity effect; Jalan, Priyanka,Chand, Hum,Srianand, Raghunathan et al.Apr 2018 Bulletin de la Société Royale des Sciences de Liège, in Proceedings of the First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop, November 2016, held in Nainital, India, 87, 330-333

  39. Revisiting the incidence of Mg II absorbers along the blazar sightlines; Mishra, Sapna,Chand, Hum,Gopal-Krishna et al.Apr 2018 Bulletin de la Société Royale des Sciences de Liège, in Proceedings of the First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop, November 2016, held in Nainital, India, 87, 325-329

  40. Spectroscopic and polarimetric study of radio-quiet weak emission line quasars ; Kumar, Parveen,Chand, Hum,Gopal-Krishna et al. Apr 2018 Bulletin de la Société Royale des Sciences de Liège, in Proceedings of the First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop, November 2016, held in Nainital, India, 87, 316-320

  41. [Probing the central engine and environment of AGN using ARIES 1.3-m and 3.6-m telescopes](https://ui.adsabs.harvard.edu/link_gateway/2018BSRSL..87..291C/abstractChand, Hum,Rakshit, Suvendu,Jalan, Priyanka et al. Apr 2018 Bulletin de la Société Royale des Sciences de Liège, in Proceedings of the First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop, November 2016, held in Nainital, India, Vol. 87, pp. 291-298

  42. The 4-m International Liquid Mirror Telescope; Surdej, Jean,Hickson, Paul,Borra, Hermanno et al. Apr 2018 Bulletin de la Société Royale des Sciences de Liège, in Proceedings of the First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop, November 2016, held in Nainital, India, Vol. 87, pp. 68-79

  43. 3.6-m Devasthal Optical Telescope Project: Completion and first results; Kumar, Brijesh,Omar, Amitesh, Maheshwar, Gopinathan et al.Apr 2018 Bulletin de la Société Royale des Sciences de Liège, in Proceedings of the First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop, November 2016, held in Nainital, India, Vol. 87, pp. 29-41

  44. TIFR Near Infrared Imaging Camera-II on the 3.6 m Devasthal Optical Telescope Baug, T.,Ojha, D. K.,Ghosh, S. K. et al. Mar 2018 Journal of Astronomical Instrumentation, Volume 7, Issue 1, id. 1850003-1881

  45. On the incidence of Mg II absorbers along the blazar sightlines Mishra, S.,Chand, H.,Krishna, Gopal- et al. Feb 2018 Monthly Notices of the Royal Astronomical Society, Volume 473, Issue 4, p.5154-5164

  46. Multi-epoch intranight optical monitoring of eight radio-quiet BL Lac candidates Kumar, P.,Gopal-Krishna,Stalin, C. S. et al. Oct 2017 Monthly Notices of the Royal Astronomical Society, Volume 471, Issue 1, p.606-616

  47. VizieR Online Data Catalog: Narrow line Seyfert 1 galaxies from SDSS-DR12 Rakshit, S.,Stalin, C. S.,Chand, H. et al. Jun 2017 VizieR On-line Data Catalog: J/ApJS/229/39. Originally published in: 2017ApJS..229...39R

  48. A Catalog of Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey Data Release 12 Rakshit, Suvendu,Stalin, C. S.,Chand, Hum et al. Apr 2017 The Astrophysical Journal Supplement Series, Volume 229, Issue 2, article id. 39, 16 pp. (2017)

  49. Probing Magnetic Fields with Square Kilometre Array and its Precursors Roy, Subhashis,Sur, Sharanya,Subramanian, Kandaswamy et al. Dec 2016 Journal of Astrophysics and Astronomy, Volume 37, Issue 4, article id.42, 30 pp.

  50. Intranight optical variability of radio-quiet weak emission line quasars - IV Kumar, Parveen,Chand, Hum,Gopal-Krishna et al. Sep 2016 Monthly Notices of the Royal Astronomical Society, Volume 461, Issue 1, p.666-673

  51. The origin of UV-optical variability in AGN and test of disc models: XMM-Newton and ground-based observations of NGC 4395 McHardy, I. M.,Connolly, S. D.,Peterson, B. M. et al. May 2016 Astronomische Nachrichten, Vol.337, Issue 4-5, p.500

  52. X-ray - UV/optical lag measurement in the very low mass AGN NGC4395 using the OM in sub-second readout mode: Implications for disc models McHardy, I.,Connolly, S.,Gandhi, P. et al. Jul 2015 The Extremes of Black Hole Accretion, Proceedings of the conference held 8-10 June, 2015 in Madrid, Spain. Online at <A href="http://www.cosmos.esa.int/web/xmm-newton/2015-workshop/"> http://www.cosmos.esa.int/web/xmm-newton/2015-workshop/</A>, id.49

  53. A search for the elusive radio-quiet BL Lacs Kumar, Parveen,Chand, Hum,Gopal-Krishna et al. Jan 2015 Recent Trends in the Study of Compact Objects (RETCO-II): Theory and Observation. ASI Conference Series, 2015, Vol. 12, pp 133-134 Edited by Indranil Chattopadhyay, Anuj Nandi, Santabrata Das and Samir Mandal

  54. Probing AGN central engine and its environment based on their photometry and spectroscopy Chand, H.,Joshi, Ravi, et al. Jan 2015 Recent Trends in the Study of Compact Objects (RETCO-II): Theory and Observation. ASI Conference Series, 2015, Vol. 12, pp 79-80 Edited by Indranil Chattopadhyay, Anuj Nandi, Santabrata Das and Samir Mandal

  55. C IV absorption-line variability in X-ray-bright broad absorption-line quasi-stellar objects Joshi, Ravi,Chand, Hum,Srianand, Raghunathan et al. Jul 2014 Monthly Notices of the Royal Astronomical Society, Volume 442, Issue 1, p.862-869

  56. Intranight optical variability of radio-quiet weak emission line quasars - II Chand, Hum,Kumar, Parveen,Gopal-Krishna et al. Jun 2014 Monthly Notices of the Royal Astronomical Society, Volume 441, Issue 1, p.726-732

  57. C IV absorption line variability in X-ray bright BALQSOs Joshi, Ravi,Chand, Hum,Srianand, Raghunathan et al. Jan 2014 eprint arXiv:1401.5593

  58. Incidence of strong Mg II absorbers towards different types of quasars Joshi, Ravi,Chand, Hum,Gopal-Krishna et al. Oct 2013 Monthly Notices of the Royal Astronomical Society, Volume 435, Issue 1, p.346-354

  59. Dependence of residual rotation measure on intervening Mg II absorbers at cosmic distances Joshi, Ravi,Chand, Hum, et al. Oct 2013 Monthly Notices of the Royal Astronomical Society, Volume 434, Issue 4, p.3566-3571

  60. Signature of outflows in strong mgii absorbers in quasar sightlines. Sharma, M.,Nath, B. B.,Chand, H. et al. Apr 2013 Mon. Not. R. Astron. Soc., Vol. 431, p. L93-L97 (2013)

  61. Intranight optical variability of radio-quiet weak emission line quasars Gopal-Krishna,Joshi, Ravi,Chand, Hum et al. Apr 2013 Monthly Notices of the Royal Astronomical Society, Volume 430, Issue 2, p.1302-1308

  62. Intranight optical variability of radio-loud broad absorption line quasars Joshi, Ravi,Chand, Hum, et al. Feb 2013 Monthly Notices of the Royal Astronomical Society, Volume 429, Issue 2, p.1717-1724

  63. Incidence of Mg II Absorption Systems toward Flat-spectrum Radio Quasars Chand, Hum,Gopal-Krishna, et al. Jul 2012 The Astrophysical Journal, Volume 754, Issue 1, article id. 38, 6 pp. (2012)

  64. Probing spectral properties of radio-quiet quasars searched for optical microvariability - II Joshi, Ravi,Chand, Hum,Wiita, Paul J. et al. Feb 2012 Monthly Notices of the Royal Astronomical Society, Volume 419, Issue 4, pp. 3433-3446.

  65. Probing Spectral Properties of Radio-quiet Quasars Searched for Optical Microvariability Wiita, Paul J.,Joshi, R.,Chand, H. et al. Jan 2012 American Astronomical Society, AAS Meeting #219, id.154.15

  66. Re-Analysis of QPO in 3C 273 Light Curve Mohan, P.,Mangalam, A.,Chand, Hum et al. Jun 2011 Journal of Astrophysics and Astronomy, Volume 32, Issue 1-2, pp. 117-120

  67. Optical microvariability properties of BALQSOs Joshi, Ravi,Chand, Hum,Gupta, Alok C. et al. Apr 2011 Monthly Notices of the Royal Astronomical Society, Volume 412, Issue 4, pp. 2717-2728.

  68. Probing spectral properties of radio-quiet quasars searched for optical microvariability Chand, Hum,Wiita, Paul J.,Gupta, Alok C. et al. Feb 2010 Monthly Notices of the Royal Astronomical Society, Volume 402, Issue 2, pp. 1059-1071.

  69. Constraining Fundamental Constants of Physics with Quasar Absorption Line Systems Petitjean, Patrick,Srianand, Raghunathan,Chand, Hum et al. Dec 2009 Space Science Reviews, Volume 148, Issue 1-4, pp. 289-300

  70. Probing the variation of fundamental constants using QSO absorption lines. Srianand, R.,Petitjean, P.,Chand, H. et al. Jan 2009 Memorie della Società Astronomica Italiana, v.80, p.842 (2009)

  71. On the Variation of the Fine-structure Constant and Precision Spectroscopy " Chand, H.,Srianand, R.,Petitjean, P. et al. Jan 2008 Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. Edited by N.C. Santos, L. Pasquini, A.C.M. Correia, and M. Romanielleo. Garching, Germany, 2008 pp. 101-104

  72. Editorial Note: Srianand etal. Reply [Phys. Rev. Lett. 99239002 (2007)] " Srianand, R.,Chand, H.,Petitjean, P. et al. Jan 2008 Physical Review Letters, vol. 100, Issue 2, id. 029902

  73. Srianand etal. Reply: Srianand, R.,Chand, H.,Petitjean, P. et al. Dec 2007 Physical Review Letters, vol. 99, Issue 23, id. 239002

  74. In response to the comments by Murphy et al. (arxiv:0708.3677) Srianand, Raghunathan,Chand, Hum,Petitjean, Patrick et al. Nov 2007 eprint arXiv:0711.1742

  75. Line shift line asymmetry and the \^6Li/\^7Li isotopic ratio determination " Cayrel, R.,Steffen, M.,Chand, H. et al. Oct 2007 Astronomy and Astrophysics, Volume 473, Issue 3, October III 2007, pp.L37-L40

  76. Variation of the fine-structure constant: very high resolution spectrum of QSO HE 0515-4414 Chand, H.,Srianand, R.,Petitjean, P. et al. May 2006 Astronomy and Astrophysics, Volume 451, Issue 1, May III 2006, pp.45-56

  77. Does the Fine-Structure Constant Vary? Chand, H.,Srianand, R.,Petitjean, P. et al. Sep 2005 Bulletin of the Astronomical Society of India, Vol. 33, p. 350-350

  78. 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 Ivanchik, A.,Petitjean, P.,Varshalovich, D. et al. Sep 2005 Astronomy and Astrophysics, Volume 440, Issue 1, September II 2005, pp.45-52

  79. The density structure around quasars from optical depth statistics; Rollinde, Emmanuel,Srianand, Raghunathan,Theuns, Tom et al. Aug 2005 Monthly Notices of the Royal Astronomical Society, Volume 361, Issue 3, pp. 1015-1029.

  80. Probing the variation of the fine-structure constant using QSO absorption lines Chand, H.,Srianand, R.,Petitjean, P. et al. Mar 2005 Probing Galaxies through Quasar Absorption Lines, IAU Colloquium Proceedings of the International Astronomical Union 199, held March 14-18 2005, Shanghai, People's Republic of China, edited by Peter R. Williams, Cheng-Gang Shu and Brice Menard. Cambridge: Cambridge University Press 2005., pp.409-411

  81. Probing the time-variation of the fine-structure constant: Results based on Si IV doublets from a UVES sample Chand, H.,Petitjean, P.,Srianand, R. et al. Jan 2005 Astronomy and Astrophysics, v.430, p.47-58 (2005)

  82. The density structure around quasars inferred from optical depth statistics Rollinde, E.,Srianand, R.,Theuns, T. et al. Dec 2004 SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret, T. Contini, F. Meynadier and L. Pagani. Published by EdP-Sciences, Conference Series, 2004, p. 715.

  83. The large programme""Cosmic Evolution of the IGM"" " Bergeron, J.,Petitjean, P.,Aracil, B. et al. Dec 2004 The Messenger (ISSN0722-6691), No.118, p. 40-44 (December 2004)

  84. Constraining the time variation of the fine structure constant Srianand, R.,Petitjean, Patrick,Chand, Hum et al. Jun 2004 The Messenger (ISSN0722-6691), No.116, p. 25-28 (June 2004)
  85. Variation avec le temps cosmique du rapport de la masse du proton à celle de l'électron Petitjean, Patrick,Ivanchik, A.,Srianand, Raghunathan et al. Apr 2004 Comptes rendus - Physique, Volume 5, Issue 3, p. 411-415.

  86. 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 Srianand, R.; Chand, H.; Petitjean, P.; Aracil, B., 2004, PhRvL,92l1302S

  87. Probing the cosmological variation of the fine-structure constant: Results based on VLT-UVES sample Chand, H.,Srianand, R.,Petitjean, P. et al. Apr 2004 Astronomy and Astrophysics, v.417, p.853-871 (2004)