English

KVN observations suggest multiple $\gamma$-ray emission regions in 3C 84

High Energy Astrophysical Phenomena 2018-02-09 v1

Abstract

3C 84 (NGC 1275) is a well-studied mis-aligned Active Galactic Nucleus (AGN), which has been active in Gamma rays since at least 2008. We have monitored the source at four wavelengths (14 mm, 7 mm, 3 mm and 2 mm) using the Korean VLBI network (KVN) since 2013 as part of the interferometric monitoring of γ\gamma-ray bright AGN (iMOGABA) program. 3C 84 exhibits bright radio emission both near the central supermassive black hole (SMBH) feature known as C1 and from a moving feature located to the south known as C3. Other facilities have also detected these short-term variations above a slowly rising trend at shorter wavelengths, such as in Gamma ray and 1 mm total intensity light-curves. We find that the variations in the γ\gamma rays and 1 mm total intensity light-curves are correlated, with the γ\gamma rays leading and lagging the radio emission. Analysis of the 2 mm KVN data shows that both the Gamma rays and 1 mm total intensity short-term variations are better correlated with the SMBH region than C3, likely placing the short-term variations in C1. We interpret the emission as being due to the random alignment of spatially separated emission regions. We place the slowly rising trend in C3, consistent with previous results. Additionally, we report that since mid-2015, a large mm-wave radio flare has been occurring in C3, with a large Gamma ray flare coincident with the onset of this flare at all radio wavelengths.

Keywords

Cite

@article{arxiv.1802.02763,
  title  = {KVN observations suggest multiple $\gamma$-ray emission regions in 3C 84},
  author = {Jeffrey A. Hodgson and Bindu Rani and Sang-Sung Lee and Juan Carlos Algaba and Motoki Kino and Sascha Trippe and Jong-Ho Park and Guang-Yao Zhao and Do-Young Byun and Sincheol Kang and Jae-Young Kim and Jeong-Sook Kim and Soon-Wook Kim and Atsushi Miyazaki and Kiyoaki Wajima and Junghwan Oh and Dae-won Kim and Mark Gurwell},
  journal= {arXiv preprint arXiv:1802.02763},
  year   = {2018}
}

Comments

12 pages, 12 figures, accepted to MNRAS