Zobrazeno 1 - 10
of 31
pro vyhledávání: '"V. L. Oknyanskij"'
Autor:
V. L. Oknyanskij
Publikováno v:
Odessa Astronomical Publications, Vol 12, Iss 0, Pp 99-101 (2017)
The Optical-to-Near-infrared variability time delay have already been reported for a small number (∼ 7) of AGNs and has been firmly established only for 5 of them. The time delay is probably increasing with the IR wavelengths. The most naturally th
Externí odkaz:
https://doaj.org/article/6216631355364c809dc51b123dd72590
Autor:
V. L. Oknyanskij, N. A. Huseynov, V. M. Lipunov, A. M. Tatarnikov, N. I. Shatsky, S. S. Tsygankov, V. G. Metlov, I. R. Salmanov, C. M. Gaskell
Publikováno v:
Odessa Astronomical Publications, Vol 29, Iss 0, Pp 92-94 (2016)
The Changing Look AGNs (CL AGNs) are objects which undergo dramatic variability of the emission line profiles and classification type of which can move from one spectral class to another within very short time interval (from days to years). We start
Externí odkaz:
https://doaj.org/article/180785d04891440f813d6e266e15c219
Publikováno v:
Odessa Astronomical Publications, Vol 29, Iss 0, Pp 95-97 (2016)
We present the historical light curve of NGC 4151 for 1906–2016. The light curve (Oknyanskij and Lyuty, 2007) is primarily based on our published photoelectric data (1968–2007, about 1040 nightly mean measurements (Oknyanskij and Lyuty, 2007)) an
Externí odkaz:
https://doaj.org/article/e3a878f778dc40d39a7829af8e346620
Autor:
V. L. Oknyanskij
Publikováno v:
Odessa Astronomical Publications, Vol 7, Iss 1, Pp 163-164 (2017)
Applying a specific cross-correlation method, we obtained evidence that changes in the radio flux appear to lag behind the optical variations of the quasar by about 6.4 years. Our analysis of rapid continuum variations gave some constraints on the si
Externí odkaz:
https://doaj.org/article/6c619b205e464217bd076ab4f890d8a3
Autor:
E. Koptelova, W. P. Chen, T. Chiueh, B. P. Artamonov, V. L. Oknyanskij, S. N. Nuritdinov, O. Burkhonov, T. Akhunov, V. V. Bruevich, O. V. Ezhkova, A. S. Gusev, A. V. Sergeyev, Sh. A. Ehgamberdiev, M. A. Ibragimov
Publikováno v:
Odessa Astronomical Publications, Vol 25, Iss 2, Pp 169-171 (2012)
We study brightness variations in the double lensed quasar UM673 (Q0142-100) with the aim of measuring the time delay between its two images. Methods.. We analyzed the V, R and I-band light curves of the A and B images of UM673, which cover ten obser
Externí odkaz:
https://doaj.org/article/5540beda74264d6685ae69c60d87bbad
Publikováno v:
Odessa Astronomical Publications, Vol 26, Iss 2, Pp 212-213 (2013)
We present the historical light curve of NGC 4151 for 1906 - 2013 and the detailed light curve for 2008 - 2013 the light curve of NGC 4151 for 2008 - 2013 (our photoelectrical and CCD data obtained at 2 observatories during last 6 years). See details
Externí odkaz:
https://doaj.org/article/f43f550a6d0342888f3f29f4850af110
Autor:
V. L. Oknyanskij, V. M. Lyuty
Publikováno v:
Odessa Astronomical Publications, Vol 20, Iss 1 (2007)
We present historical light curve of NGC 4151 (Fig.1.) for 1906-2007. The light curve include mostly our published photoelectric (taken during the years 1968-2007 ≈ 1040 mean per night measurements) and photographic (mostly Odessa's and Moscow's pl
Externí odkaz:
https://doaj.org/article/df8dd93b4c4a4f0c8af87f142d69c132
Publikováno v:
Odessa Astronomical Publications, Vol 21, Iss 0, Pp 79-80 (2008)
We combine all published and new unpublished yet NIR (near infrared) photometrical observations of NGC 4151 which can be used for determination of time delays between optical and NIR variations. In previous study we have found that the values of time
Externí odkaz:
https://doaj.org/article/688c98b0c758468b9193d51a81b35ae1
Publikováno v:
Odessa Astronomical Publications, Vol 29, Iss 0, Pp 95-97 (2016)
Odessa Astronomical Publications; Том 29 (2016); 95-97
Odessa Astronomical Publications; Том 29 (2016): Odessa Astronomical Publications; 95-97
Odessa Astronomical Publications; Том 29 (2016); 95-97
Odessa Astronomical Publications; Том 29 (2016): Odessa Astronomical Publications; 95-97
We present the historical light curve of NGC 4151 for 1906–2016. The light curve (Oknyanskij and Lyuty, 2007) is primarily based on our published photoelectric data (1968–2007, about 1040 nightly mean measurements (Oknyanskij and Lyuty, 2007)) an
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 401:2805-2815
We present the results of time delay measurements between the A and B components of the gravitationally lensed quasar UM673. The measurements are based on the brightness variations of the quasar components observed with the 1.5-m telescope of the Mai