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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| Format: | Article |
| Language: | English |
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De Gruyter
2016-06-01
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| Series: | Open Astronomy |
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| Online Access: | https://doi.org/10.1515/astro-2017-0125 |
| _version_ | 1819132053373845504 |
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| author | Donskykh Ganna |
| author_facet | Donskykh Ganna |
| author_sort | Donskykh Ganna |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-22T09:25:17Z |
| format | Article |
| id | doaj.art-47fc62a6b8ca47ed9dad69f80256e48c |
| institution | Directory Open Access Journal |
| issn | 2543-6376 |
| language | English |
| last_indexed | 2024-12-22T09:25:17Z |
| publishDate | 2016-06-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Open Astronomy |
| spelling | doaj.art-47fc62a6b8ca47ed9dad69f80256e48c2022-12-21T18:31:06ZengDe 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) |
| 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) |
| title | 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_short | 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 |
| topic | quasars bl lacertae objects: individual (oj 287) |
| url | https://doi.org/10.1515/astro-2017-0125 |
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