Program and Results of Investigations Rapid Variability of the BL Lac Object 3C 371 in Radio and Optical Ranges
BL Lac object 3C 371 is variable in optical and radio range, according to long-term monitoring data, for example AAVSO (American Association of Variable Star Observers) and OVRO (Owens Valley Radio Observatory). In addition, some authors note intra-night variability. However, in terms of access, jus...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-09-01
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| Series: | Galaxies |
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| Online Access: | https://www.mdpi.com/2075-4434/8/3/69 |
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| author | Artem Sukharev Michail Ryabov Vladislavs Bezrukovs Arturs Orbidans Marcis Bleiders Sergei Udovichenko Leonid Keir Ilgmars Eglitis Igor Kudsey Pavol Dubovsky |
| author_facet | Artem Sukharev Michail Ryabov Vladislavs Bezrukovs Arturs Orbidans Marcis Bleiders Sergei Udovichenko Leonid Keir Ilgmars Eglitis Igor Kudsey Pavol Dubovsky |
| author_sort | Artem Sukharev |
| collection | DOAJ |
| description | BL Lac object 3C 371 is variable in optical and radio range, according to long-term monitoring data, for example AAVSO (American Association of Variable Star Observers) and OVRO (Owens Valley Radio Observatory). In addition, some authors note intra-night variability. However, in terms of access, just a few works are devoted to this topic, and questions remain about intra-day variability in radio range. The purpose of the work is to search for fast variability in radio (5, 6.1, 6.7 GHz) and optical bands (V, R, I) using international cooperation in 2019 and 2020 observation sessions. The 16-m radio telescope VIRAC, in Latvia, as well as optical telescopes AZT-3 (Mayaki, Ukraine), VNT (Vihorlat, Slovakia), and Schmidt camera (Baldone, Latvia) were used. To analyze variability, the STFT method of spectrograms and Lomb–Scargle periodograms for non-uniform time series were used. As result of the work, there is no correlation between optical and radio observations, and no significant quasi-harmonic variability was detected in radio range, but there is irregular low amplitude variability. In the optical range, there is variability with a characteristic time of about seven days and possibly less. Cyclical variability of 3C 371 was found in the optical range, and intra-day variability in radio range is most likely absent, as there are irregular variations and noise. It is planned to continue joint radio-optical observations 3C 371 to accumulate the necessary statistics. |
| first_indexed | 2024-03-10T16:10:56Z |
| format | Article |
| id | doaj.art-b476dc5996b244cca58e661e1024f4ce |
| institution | Directory Open Access Journal |
| issn | 2075-4434 |
| language | English |
| last_indexed | 2024-03-10T16:10:56Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Galaxies |
| spelling | doaj.art-b476dc5996b244cca58e661e1024f4ce2023-11-20T14:27:59ZengMDPI AGGalaxies2075-44342020-09-01836910.3390/galaxies8030069Program and Results of Investigations Rapid Variability of the BL Lac Object 3C 371 in Radio and Optical RangesArtem Sukharev0Michail Ryabov1Vladislavs Bezrukovs2Arturs Orbidans3Marcis Bleiders4Sergei Udovichenko5Leonid Keir6Ilgmars Eglitis7Igor Kudsey8Pavol Dubovsky9Ventspils International Radio Astronomy Centre (VIRAC) Inzenieru Str. 101, LV-3601 Ventspils, LatviaOdessa Observatory “URAN-4”, Institute of Radio Astronomy NAS of Ukraine Marazlievskaya Str. 1V, 65014 Odessa, UkraineVentspils International Radio Astronomy Centre (VIRAC) Inzenieru Str. 101, LV-3601 Ventspils, LatviaVentspils International Radio Astronomy Centre (VIRAC) Inzenieru Str. 101, LV-3601 Ventspils, LatviaVentspils International Radio Astronomy Centre (VIRAC) Inzenieru Str. 101, LV-3601 Ventspils, LatviaAstronomical Observatory of Odessa I.I. Mechnikov National University Marazlievskaya Str. 1V, 65014 Odessa, UkraineAstronomical Observatory of Odessa I.I. Mechnikov National University Marazlievskaya Str. 1V, 65014 Odessa, UkraineBaldone Astronomical Observatory, University of Latvia Baldone, LV-2125 Baldone Region, LatviaVihorlat Astronomical Observatory Mierova Str. 4, 06601 Humenne, SlovakiaVihorlat Astronomical Observatory Mierova Str. 4, 06601 Humenne, SlovakiaBL Lac object 3C 371 is variable in optical and radio range, according to long-term monitoring data, for example AAVSO (American Association of Variable Star Observers) and OVRO (Owens Valley Radio Observatory). In addition, some authors note intra-night variability. However, in terms of access, just a few works are devoted to this topic, and questions remain about intra-day variability in radio range. The purpose of the work is to search for fast variability in radio (5, 6.1, 6.7 GHz) and optical bands (V, R, I) using international cooperation in 2019 and 2020 observation sessions. The 16-m radio telescope VIRAC, in Latvia, as well as optical telescopes AZT-3 (Mayaki, Ukraine), VNT (Vihorlat, Slovakia), and Schmidt camera (Baldone, Latvia) were used. To analyze variability, the STFT method of spectrograms and Lomb–Scargle periodograms for non-uniform time series were used. As result of the work, there is no correlation between optical and radio observations, and no significant quasi-harmonic variability was detected in radio range, but there is irregular low amplitude variability. In the optical range, there is variability with a characteristic time of about seven days and possibly less. Cyclical variability of 3C 371 was found in the optical range, and intra-day variability in radio range is most likely absent, as there are irregular variations and noise. It is planned to continue joint radio-optical observations 3C 371 to accumulate the necessary statistics.https://www.mdpi.com/2075-4434/8/3/693C 371BL Lac objectvariabilityradio telescope |
| spellingShingle | Artem Sukharev Michail Ryabov Vladislavs Bezrukovs Arturs Orbidans Marcis Bleiders Sergei Udovichenko Leonid Keir Ilgmars Eglitis Igor Kudsey Pavol Dubovsky Program and Results of Investigations Rapid Variability of the BL Lac Object 3C 371 in Radio and Optical Ranges Galaxies 3C 371 BL Lac object variability radio telescope |
| title | Program and Results of Investigations Rapid Variability of the BL Lac Object 3C 371 in Radio and Optical Ranges |
| title_full | Program and Results of Investigations Rapid Variability of the BL Lac Object 3C 371 in Radio and Optical Ranges |
| title_fullStr | Program and Results of Investigations Rapid Variability of the BL Lac Object 3C 371 in Radio and Optical Ranges |
| title_full_unstemmed | Program and Results of Investigations Rapid Variability of the BL Lac Object 3C 371 in Radio and Optical Ranges |
| title_short | Program and Results of Investigations Rapid Variability of the BL Lac Object 3C 371 in Radio and Optical Ranges |
| title_sort | program and results of investigations rapid variability of the bl lac object 3c 371 in radio and optical ranges |
| topic | 3C 371 BL Lac object variability radio telescope |
| url | https://www.mdpi.com/2075-4434/8/3/69 |
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