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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Multiwavelength analysis of brightness variations of 3C 279: probing the relativistic jet structure and its evolution

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Beaklini, Pedro P. B. [1] ; Dominici, Tania P. [2] ; Abraham, Zulema [1] ; Motter, Juliana C. [3]
Total Authors: 4
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, BR-05508090 Sao Paulo, SP - Brazil
[2] Mct, Museu Astron & Ciencias Afins, Mast, Rua Gen Bruce 586, BR-20921030 Bairro Imperial De Sao C, RJ - Brazil
[3] Univ Fed Rio Grande do Sul, Dept Astron, Ave Bento Goncalves 9500, BR-91501970 Porto Alegre, RS - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Astronomy & Astrophysics; v. 626, JUN 17 2019.
Web of Science Citations: 1

Aims. We studied the correlation between brightness and polarization variations in 3C 279 at different wavelengths, over time intervals long enough to cover the time lags due to opacity effects. We used these correlations together with VLBI images to constrain the radio and high energy source position. Methods. We made 7 mm radio continuum and R-band polarimetric observations of 3C 279 between 2009 and 2014. The radio observations were performed at the Itapetinga Radio Observatory, while the polarimetric data were obtained at Pico dos Dias Observatory, both in Brazil. We compared our observations with the gamma-ray Fermi/LAT and R-band SMARTS light curves. Results. We found a good correlation between 7 mm and R-band light curves, with a delay of 170 +/- 30 days in radio, but no correlation with the gamma rays. However, a group of several gamma-ray flares in April 2011 could be associated with the start of the 7 mm strong activity observed at the end of 2011.We also detected an increase in R-band polarization degree and rotation of the polarization angle simultaneous with these flares. Contemporaneous VLBI images at the same radio frequency show two new strong components close to the core, ejected in directions very different from that of the jet. Conclusions. The good correlation between radio and R-band variability suggests that their origin is synchrotron radiation. The lack of correlation with gamma-rays produced by the Inverse Compton process on some occasions could be due to the lack of low energy photons in the jet direction or to absorption of the high energy photons by the broad line region clouds. The variability of the polarization parameters during flares can be easily explained by the combination of the jet polarization parameters and those of newly formed jet components. (AU)

FAPESP's process: 14/07460-0 - Targets for LLAMA: study of variability of radio sources at 43 GHz (band 1) and search for correlation with interferometric images
Grantee:Pedro Paulo Bonetti Beaklini
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 08/11382-3 - A AGN study in the age of the Fermi and the H.E.S.S
Grantee:Pedro Paulo Bonetti Beaklini
Support type: Scholarships in Brazil - Doctorate