Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 474, Issue 1, Pages 1296-1306Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx2786
Keywords
polarization; galaxies: active; galaxies: jets; galaxies: nuclei; gamma-rays: galaxies
Categories
Funding
- 'RoboPol' project
- European Social Fund (ESF)
- Greek National Resources
- European Commission Seventh Framework Programme [PCIG10-GA-2011-304001, PIRSES-GA-2012-31578]
- NASA [NNX11A043G, NNX13AQ89G, NNX16AR41G]
- NSF [AST-1109911]
- Polish National Science Centre [2011/01/B/ST9/04618]
- European Commission Seventh Framework Programme hrough the Marie Curie Career Integration Grant [PCIG-GA-2011-293531]
- NASA Headquarters under the NASA Earth and Space Science Fellowship Program [NNX14AQ07H]
- NASA [NNX13AQ89G, 464646] Funding Source: Federal RePORTER
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We use results of our 3 yr polarimetric monitoring programme to investigate the previously suggested connection between rotations of the polarization plane in the optical emission of blazars and their gamma-ray flares in the GeV band. The homogeneous set of 40 rotation events in 24 sources detected by RoboPol is analysed together with the gamma-ray data provided by Fermi-LAT. We confirm that polarization plane rotations are indeed related to the closest gamma-ray flares in blazars and the time lags between these events are consistent with zero. Amplitudes of the rotations are anticorrelated with amplitudes of the gamma-ray flares. This is presumably caused by higher relativistic boosting (higher Doppler factors) in blazars that exhibit smaller amplitude polarization plane rotations. Moreover, the time-scales of rotations and flares are marginally correlated.
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