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dc.contributor.authorZywucka, Natalia
dc.contributor.authorBöttcher, Markus
dc.contributor.authorTarnopolski, Mariusz
dc.contributor.authorStawarz, Lukasz
dc.contributor.authorMarchenko, Volodymyr
dc.date.accessioned2020-03-31T13:31:52Z
dc.date.available2020-03-31T13:31:52Z
dc.date.issued2019
dc.identifier.citationZywucka, N. et al. 2019. Optical variability modelling of newly identified blazars and blazar candidates behind magellanic clouds. Proceedings of High Energy Phenomena in Relativistic Outflows VII (HEPRO VII), Barcelona (Spain), 9-12 July 2019. Proceedings of science, 354: #026. [https://doi.org/10.22323/1.354.0026]en_US
dc.identifier.issn1824-8039
dc.identifier.urihttp://hdl.handle.net/10394/34464
dc.identifier.urihttps://pos.sissa.it/354/026/pdf
dc.identifier.urihttps://doi.org/10.22323/1.354.0026
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ab5fe5
dc.description.abstractWe present results of a variability study in the optical band of 44 newly identified blazar candidates behind the Magellanic Clouds. Our sample contains 27 flat spectrum radio quasars (FSRQs) and 17 BL Lacertae objects (BL Lacs). However, only nine of them are considered as secure blazar candidates, while the classification of the remaining 35 objects is still uncertain. All studied blazar candidates possess infrequently sampled optical light curves (LCs) in I filter provided by the Optical Gravitational Lensing Experiment group. The LCs were analysed with the Lomb-Scargle periodogram, the Hurst exponent H, and the A −T plane, to look for blazar-like characteristic features and to study the long-term behaviour of the optical fluxes. The power law (PL) indices of the Lomb-Scargle power spectral density (PSD) of the FSRQ blazar candidates mostly lie in the range (1,2). In case of the BL Lacs they are located in the range (1,1.8). The PL PSD is indicative of a self-affine stochastic process characterised by H, underlying the observed variability. We find that the majority of analysed objects have H ≤ 0.5, indicating short-term memory, whereas four BL Lacs and two FSRQs have H > 0.5, implying long-term memory. 41 blazar candidates are located in the A −T plane in the region available to PL plus Poisson noise processes. Interestingly, one FSRQ is located marginally below this region, while two FSRQs lie above the line T = 2/3, i.e. they are even more noisy than white noise. The BL Lac candidates are characterised by higher A values than FSRQs, i.e. 0.71±0.06 and 0.29±0.05, respectivelyen_US
dc.language.isoenen_US
dc.publisherSissa Medialaben_US
dc.subjectActive galactic nuclei
dc.subjectActive galaxies
dc.subjectBL Lacertae objects
dc.subjectMagellanic Clouds
dc.subjectSmall Magellanic Cloud
dc.subjectLarge Magellanic Cloud
dc.titleOptical variability modelling of newly identified blazars and blazar candidates behind Magellanic cloudsen_US
dc.typePresentationen_US
dc.contributor.researchID34208968 - Zywucka-Hejzner, Natalia
dc.contributor.researchID24420530 - Böttcher, Markus


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