The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 42 Issue 1
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- Pages.45.2-46
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- 2017
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- 1226-2692(pISSN)
Flux Variation and Structural Change in 3C 84 with Long-Term Monitoring by KVN and KaVA at Millimeter Wavelengths
- Wajima, Kiyoaki (Korea Astronomy and Space Science Institute) ;
- Kino, Motoki (Korea Astronomy and Space Science Institute) ;
- Kawakatu, Nozomu (National Institute of Technology, Kure College)
- Published : 2017.04.10
Abstract
3C 84 (NGC 1275) is one of the most famous radio galaxies and a lot of VLBI observations have been conducted to date because of its brightness and proximity (z = 0.0176; 1 mas = 0.36 pc). The source is entering a significantly active phase with long-term increase in radio flux at cm wavelengths since 2005, and the increased activity at very-high-energy (VHE) gamma rays. In order to study properties of sub-pc-scale structure and the circumnuclear environment in 3C 84, we have conducted multi-epoch VLBI observations with the Korean VLBI Network (KVN) at 86 and 129 GHz, and monthly monitoring by the KVN and VERA Array (KaVA) at 43 GHz from 2015 August. Following the report in the previous KAS meeting (cf. 2016 KAS Autumn Annual Meeting, [구 GC-10]), we present further results mainly on the basis of twelve-epoch observations with KaVA at 43 GHz. Through the monthly monitoring with KaVA, we found that peak intensity of the pc-scale southern lobe (C3) was increased from
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