Investigation of the Jets of the Blazar 3C 279 with Korean VLBI Network (KVN) 22–129 GHz Observations

• Published in: Journal of astronomy and space sciences Vol. 38; no. 4; pp. 193 - 202
• Main Authors: Yoo, Sungmin, Lee, Sang-Sung, Kim, Sang-Hyun, An, Hongjun
• Format: Journal Article
• Language: English
• Published: 한국우주과학회 01.12.2021
• Subjects: 천문학; synchrotron self-absorption (SSA); blazar (3C 279); variability; relativistic jets
• ISSN: 2093-5587; 2093-1409
• DOI: 10.5140/JASS.2021.38.4.193

We present analysis results of Korean VLBI Network (KVN) four-band data for the highly variable blazar 3C 279. We measured the 22, 43, 86, and 129 GHz flux densities and spectral indices of the source using contemporaneous data taken over 5.6 years. We used the discrete correlation function to investigate correlations between the radio emission properties and those measured in the optical (2 × 1014 – 1.5 × 1015 Hz), X-ray (0.3–10 keV), and gamma-ray (0.1–300 GeV) bands. We found a significant correlation between the radio spectral index and gamma-ray flux without a time delay and interpreted the correlation using an extended jet scenario for blazar emission.