Victor Oknyanskij

Victor OKNYANSKIJ

Astrophysicist

(Researcher. Graduated from the Odessa State University (OSU) in 1982, Ph.D. 1986, MSU)

A member of EAS.

My general research interest include several fields:

1) Extragalactic astronomy, active nucleus of galaxies (AGNs), spectral and photometrical observations of AGNs.

2) Observational cosmology, gravitational lensing.

3) Statistical analysis of astronomical time series.

Projects I am currently working on include:
(1) Theoretical and observational research on spectral and photometrical variability of AGNs.
(2) Searching of correlations between X-ray, UV, optical, near IR and radio variability of AGNs.
(3) Developing and programing of statistical methods for time delay determination from uneven observational data sets with applications to AGNs and Gls.
(4) Optical monitoring of QSOs, AGNs and GLs (in collaboration with Dr. B.Artamonov).
(5) Project supported by Roal Society of UK "Echo Sounding of Quasars" (In collaboration with Prof. K.Horn).

ACTIVE PARTICIPATION IN INTERNATIONAL CONGRESSES

(1) International Symposium "Gravitational Lens", Hamburg, Germany, 1-10 September 1991.

(2) First Plenary Meeting of European Astronomical Society (EAS) "The Impact of Space Research on Astronomy", Liege, Belgium, 18-28 June 1992.

(3) 31st Liege International Astrophysical Colloquium "Gravitational Lenses in Universe", Liege, Belgium, June 21-29, 1993

(4) IAU Symposium No. 159, "Multi-Wavelength Continuum Emission of AGN", Geneva, Switzerland, 30 August - 9 September, 1993.

(5) International Symposium "New Horizon of X-Ray Astronomy - First Results from ASCA", Tokyo, Japan, March 5-14, 1994.

(6) Invited lecturer for international astrophysical school, ``ROZHEN'94`, Rozhen, Bulgaria, 18-29 April, 1994.

(7) IAU Symposium 173 "Astrophysical Applications of Gravitational Lensing", (University of Melbourne, Australia, July 6-20, 1995). Also was invited to make reports for the scientific seminars of AAO and ASAF in Sydney.

(8) International ASCA symposium "X-ray Imaging and Spectroscopy of Cosmic Hot Plasmas", Tokyo, Japan, 10-17 March 1996.

(9) International conference "Blazars, black holes and jets", Girona, Spain, 7-14 September, 1996

(10) International conference "Astronomical Data Analysis Software and System VI", Charlottesville, Virginia, USA, 20-31 September 1996. Also was invited to make reports for the Astrophysical seminar of Pennstate University, State College.

(11) International conference "Astronomical Time Series", Tel Aviv, Israel, 27 December 1996 - 3 January 1997.

(12) International conference "Astronomical Data Analysis Software and System VII", Sonthofen, Germany, 12-19 September 1997.

(13) International ASCA Symposium "Heating and acceleration in the Universe", Tokyo, Japan, 15-23 March 1999.

(14) The Universe of Gamov: Original ideas in astrophysics and cosmology", Odessa, Odessa, August 16-21, 1999 Ukraine, 19-23 August, 1999.

REPORTS AND WORK ABROAD

From August 1994 till April 1995 a visiting researcher in Uppsala Astronomical observatory, Sweden. In collaboration with Dr. E. van Groningen analyzed optical and UV spectra of NGC 4151 using data from the LAG monitoring campaign and IUE satellite. Made 2 reports on the science seminars in Uppsala.

In April 1995 made invited reports for scientific seminars of Theoretical Astrophysics Center (Nilce Bohr Ins., Copenhagen, Denmark) and Hamburg astronomical observatory (Hamburg university, Germany) during a short visits.

In July-August 1998 and August-September 1999 visiting researcher in School of Physics and Astronomy St. Andrews University, Scotland, UK. In collaboration with Prof. K.Horn analyzed Optical and near IR photometrical data for several AGNs. Made 2 reports on the science seminars.

REFERENCES ON MOST IMPORTANT PUBLICATIONS

(1) Lyutyi V.M. Oknyanskij V.L., Chuvaev K.K. 1984. "NGC4151- Sy2 in a deepest photometrical minimum," Sov. Astron. Lett., 10, 335

(2) Lyutyi V.M., Oknyanskij V.L. 1987. The Time-amplitude Characteristics of the Optical Variability of NGC4151 in 1906-1984," Sov. Astron. 31, 245.

(3) Oknyanskij V.L.,Chuvaev K.K., Shakhovskoj N.M. 1988. The Experience of Parallel Photoelectric and Photographic Spectral Observation of the Coronal line [FeX] at Galaxy NGC4151 Nucleus Carried out at AZT-11 and 2,6-m Telescope," Bull. Crimean Astropys. Obs. 78, 88.

(4) Chuvaev K.K., Oknyanskij V.L. 1989. "Spectral Variability of the Nucleus of NGC4151 in 1972-1984," Sov. Astron. 33,1.

(5) Oknyanskij V.L. 1989."Rapid Variability of Coronal Lines and the Structure of the Emission Line Region in Active Galactic Nuclei," Soobsh. Spets. Astrofiz. Obs. 61, 70.

(6) Oknyanskij V.L., Lyuty V.M., Chuvaev K.K. 1991 "NGC 4151 after the Deep Minimum of 1984," Sov. Astron. Lett. 17 ,100.

(7) Beskin G.M., Oknyanskij V.L. 1992. "The Time Delay Determination for the First Gravitational Lens Q0957+561 A,B," in Gravitational Lens, Eds R.Kayzer, T.Schramm,S.Refsdal, in Springers Lecture Notes in Physics ser. 406, p.67.

(8) Oknyanskij V.L., Beskin G.M. 1993."Optical-optical and optical-radio time delays in Q0957+561 A&B, size of the radio source and microlensing", Proceeding of 31st Liege International Astophys. Coll. "Gravitational Lenses in Universe", p. 65.

(9) Oknyanskij V.L. 1994, "Optical-radio time delays in Q0957+561", Odessa Astronomical Publ., V.7, P.2, p.163.

(10) Oknyanskij V.L., Lyuty V.M., Chuvaev K.K. 1994, "Spectral variability of NGC4151 during 1972-1991" in: Proceedings of IAU Symp. No.159 "Multi-Wavelength Continuum Emission of AGN, IAU Symp. 159, p.401, Kluwer Acad. Publ. Dordrecht.

(11) Oknyanskij V.L. 1994, "Connection between X-ray and optical variability in NGC4151", in Proceedings of Int. Conf. "New Horizon of X-Ray Astronomy-First Results from ASCA", p.587, ed. H.Makino and T.Ohashi, Tokyo Metropolitan University. Pub. Univ. Acad. Press., 1994.

(12) Oknyanskij V.L. 1994, "Connection between X-ray and optical variability in NGC4151", Astrophys. and Space Science, 222, p.157.

(13) Beskin G.M., Oknyanskij V.L., 1995, "The optical time delay in the double quasar Q0957+561 A,B", Astron. and Astrophys., 304, p.341.

(14) Oknyanskij V.L., van Groningen E., 1997, "Optical spectral variability of NGC4151 in 1990", Astronomical and Astrophys. Transactions, 14, p.105.

(14) Oknyanskij V.L., van Groningen E., 1995, "Optical spectral variability of NGC4151 during a strong dip of X-ray covering factor in 1990", In: X-ray imaging and spectroscopy of cosmic hot plasmas, Frontiers Science Ser. No 19, p.277

(15) Oknyanskij V.L., 1995, "Why is the ``time delay controversy in Q0957+561 not yet decided''?", Proceeeding of IAU Sym. 173, Melbourne, In:"The Astrophysics of Gravitational ...", Kluwer.

(16) Grenshaw D.M. et al., 1996, "Multiwavelength observations of short time-scale variability in NGC 4151. I. Ultraviolet Observations, Astrophys. Journal, 470, p.322.

(17) Edelson R.A. et al., 1996, "Multiwavelength observations of short time-scale variability in NGC 4151. IV. Analysis of multiwavelength continuum variability", Astrophys. Journal, 470, p.364.

(18) Oknyanskij V.L., 1997, "Determination of variable time delay in uneven data sets", in ASP Conf. Ser., 1997, 125, p.162.

(19) Oknyanskij V.L.,1997, "Variable radio echoes from a jet in QSO 0957+561", Astrophys. and Space Science, 246, p.299.

(20) Oknyanskij V.L., 1997 "Optical-to-radio time delay in the gravitationally lensed QSO 0957+561", in Astronomical Time Series, eds. D.Maoz et al., Kluwer Acad. Pub., Netherlands, p. 239.

(21) Oknyanskij V.L.,1998, "Metodology of time delay change determination for unevent data sets", in ASP Conf. Ser., 145, p.488.

(22) Oknyanskij V.L., 1999, "Variable Radio Echoes from a Jet in QSO 0957+561. II. Monte-Carlo Simulations for Estimation of the Significance", 1998, Astrophys. and Space Science, 259, p.295.

(23) Oknyanskij V.L. Lyuty V.M., Taranova O.G., and Shenavrin V.I., 1999,"Correlation between the infrared and optical variations of MGC4151 in 30 years: change in sizes of the infrared source", Astronomy Letters, 25, p. 483.

I can offer you a program MCCF for time delay determinations using irregular spaced data sets. (see references 11,23). Please, use my E-mail
for the request: oknyan@sai.msu.ru

E-mail: oknyan@sai.msu.ru

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