Distinguishing radiation mechanisms and particle populations in blazar jets through long-term multi-band monitoring with RINGO3 and Fermi
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866909250128707584 |
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| author | McCall, Callum Jermak, Helen Steele, Iain A. Agudo, Iván de Almeida, Ulisses Barres Hovatta, Talvikki Lamb, Gavin P. Lindfors, Elina Mundell, Carole |
| author_facet | McCall, Callum Jermak, Helen Steele, Iain A. Agudo, Iván de Almeida, Ulisses Barres Hovatta, Talvikki Lamb, Gavin P. Lindfors, Elina Mundell, Carole |
| contents | We present the results of seven years of multicolour photometric monitoring of a sample of 31 $γ$-ray bright blazars using the RINGO3 polarimeter on the Liverpool Telescope from 2013--2020. We explore the relationships between simultaneous observations of flux in three optical wavebands along with Fermi $γ$-ray data in order to explore the radiation mechanisms and particle populations in blazar jets. We find significant correlations between optical and $γ$-ray flux with no detectable time lag, suggesting leptonic emission processes in the jets of these sources. Furthermore, we find the spectral behaviour against optical and $γ$-ray flux for many sources is best fit logarithmically. This is suggestive of a transition between bluer-/redder-when-brighter into stable-when-brighter behaviour during high activity states; a behaviour that might be missed in poorly sampled data, resulting in apparent linear relationships. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_12835 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Distinguishing radiation mechanisms and particle populations in blazar jets through long-term multi-band monitoring with RINGO3 and Fermi McCall, Callum Jermak, Helen Steele, Iain A. Agudo, Iván de Almeida, Ulisses Barres Hovatta, Talvikki Lamb, Gavin P. Lindfors, Elina Mundell, Carole High Energy Astrophysical Phenomena We present the results of seven years of multicolour photometric monitoring of a sample of 31 $γ$-ray bright blazars using the RINGO3 polarimeter on the Liverpool Telescope from 2013--2020. We explore the relationships between simultaneous observations of flux in three optical wavebands along with Fermi $γ$-ray data in order to explore the radiation mechanisms and particle populations in blazar jets. We find significant correlations between optical and $γ$-ray flux with no detectable time lag, suggesting leptonic emission processes in the jets of these sources. Furthermore, we find the spectral behaviour against optical and $γ$-ray flux for many sources is best fit logarithmically. This is suggestive of a transition between bluer-/redder-when-brighter into stable-when-brighter behaviour during high activity states; a behaviour that might be missed in poorly sampled data, resulting in apparent linear relationships. |
| title | Distinguishing radiation mechanisms and particle populations in blazar jets through long-term multi-band monitoring with RINGO3 and Fermi |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2404.12835 |