The Study of Radio Flux Density Variations of the Quasar OJ 287 by the Wavelet and the Singular Spectrum Methods

The Study of Radio Flux Density Variations of the Quasar OJ 287 by the Wavelet and the Singular Spectrum Methods

Flux density variations of the extragalactic radio source OJ 287 are studied by applying the wavelet and the singular spectrum methods to the long-term monitoring data at 14.5, 8.0 and 4.8 GHz acquired at the University of Michigan Radio Astronomy Observatory during 40 years. This monitoring signifi...

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Main Author: Donskykh Ganna
Format: Article
Language:English
Published: De Gruyter 2016-06-01
Series:Open Astronomy
Subjects:
quasars
bl lacertae objects: individual (oj 287)
Online Access:https://doi.org/10.1515/astro-2017-0125
id doaj-47fc62a6b8ca47ed9dad69f80256e48c
record_format Article
spelling doaj-47fc62a6b8ca47ed9dad69f80256e48c2021-09-06T19:40:11ZengDe GruyterOpen Astronomy2543-63762016-06-0125223724410.1515/astro-2017-0125astro-2017-0125The Study of Radio Flux Density Variations of the Quasar OJ 287 by the Wavelet and the Singular Spectrum MethodsDonskykh Ganna0Department of Astronomy, Odessa I. I. Mechnikov National University, Dvoryanskaya Str. 2, Odessa, 65082, UkraineFlux density variations of the extragalactic radio source OJ 287 are studied by applying the wavelet and the singular spectrum methods to the long-term monitoring data at 14.5, 8.0 and 4.8 GHz acquired at the University of Michigan Radio Astronomy Observatory during 40 years. This monitoring significantly supplements the episodic VLBI data. The wavelet analysis at all three frequencies revealed the presence of quasiperiods within the intervals 6.0–7.4 and 1.2–1.8 years. The singular spectrum analysis revealed the presence of quasiperiods within the intervals 6–10 and 1.6–4.0 years. For each quasiperiod the time interval of its existence was determined.https://doi.org/10.1515/astro-2017-0125quasarsbl lacertae objects: individual (oj 287)
collection DOAJ
language English
format Article
sources DOAJ
author Donskykh Ganna
spellingShingle Donskykh Ganna
The Study of Radio Flux Density Variations of the Quasar OJ 287 by the Wavelet and the Singular Spectrum Methods
Open Astronomy
quasars
bl lacertae objects: individual (oj 287)
author_facet Donskykh Ganna
author_sort Donskykh Ganna
title The Study of Radio Flux Density Variations of the Quasar OJ 287 by the Wavelet and the Singular Spectrum Methods
title_short The Study of Radio Flux Density Variations of the Quasar OJ 287 by the Wavelet and the Singular Spectrum Methods
title_full The Study of Radio Flux Density Variations of the Quasar OJ 287 by the Wavelet and the Singular Spectrum Methods
title_fullStr The Study of Radio Flux Density Variations of the Quasar OJ 287 by the Wavelet and the Singular Spectrum Methods
title_full_unstemmed The Study of Radio Flux Density Variations of the Quasar OJ 287 by the Wavelet and the Singular Spectrum Methods
title_sort study of radio flux density variations of the quasar oj 287 by the wavelet and the singular spectrum methods
publisher De Gruyter
series Open Astronomy
issn 2543-6376
publishDate 2016-06-01
description Flux density variations of the extragalactic radio source OJ 287 are studied by applying the wavelet and the singular spectrum methods to the long-term monitoring data at 14.5, 8.0 and 4.8 GHz acquired at the University of Michigan Radio Astronomy Observatory during 40 years. This monitoring significantly supplements the episodic VLBI data. The wavelet analysis at all three frequencies revealed the presence of quasiperiods within the intervals 6.0–7.4 and 1.2–1.8 years. The singular spectrum analysis revealed the presence of quasiperiods within the intervals 6–10 and 1.6–4.0 years. For each quasiperiod the time interval of its existence was determined.
topic quasars
bl lacertae objects: individual (oj 287)
url https://doi.org/10.1515/astro-2017-0125
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