VLBI and Single Dish Monitoring of 3C84 in the Period of 2009-2011

Abstract

The radio galaxy 3C 84 is a representative of gamma-ray-bright misaligned active galactic nuclei (AGNs) and one of the best laboratories to study the radio properties of the sub-pc jet in connection with the gamma-ray emission. In order to identify possible radio counterparts of the gamma-ray emissions in 3C 84, we study the change in structure within the central 1 pc and the light curve of sub-pc-size components C1, C2, and C3. We search for any correlation between changes in the radio components and the gamma-ray flares by making use of VLBI and single dish data. Throughout the radio monitoring spanning over two GeV gamma-ray flares detected by the {\it Fermi}-LAT and the MAGIC Cherenkov Telescope in the periods of 2009 April to May and 2010 June to August, total flux density in radio band increases on average. This flux increase mostly originates in C3. Although the gamma-ray flares span on the timescale of days to weeks, no clear correlation with the radio light curve on this timescale is found. Any new prominent components and change in morphology associated with the gamma-ray flares are not found on the VLBI images.

6 pages, 3 figures, accepted for publication in MNRAS letter

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• Probing the Inner Jet of the Quasar PKS 1510-089 with Multi-waveband Monitoring during Strong Gamma-ray Activity
• A change in the optical polarization associated with a gamma-ray flare in the blazar 3C 279
• Detection of very-high energy γ-ray emission from NGC 1275 by the MAGIC telescopes
• Discovery of gamma-ray emission from the Broad Line Radio Galaxy Pictor A

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• The ALMA Discovery of the Rotating Disk and Fast Outflow of Cold Molecular Gas in NGC 1275
• Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy gamma-rays
• Gamma-ray flaring activity of NGC 1275 in 2016-2017 measured by MAGIC
• A Non-thermal Study of the Brightest Cluster Galaxy NGC 1275 - The Gamma-Radio Connection Over Four Decades
• KVN observations suggest multiple $\gamma$-ray emission regions in 3C 84
• The origins of the gamma-ray flux variations of NGC 1275 based on 8 years of Fermi-LAT observations
• GENJI Programme: Gamma-ray Emitting Notable AGN Monitoring by Japanese VLBI
• Jet kinematics in the transversely stratified jet of 3C 84 A two-decade overview
• Constraints on Circumnuclear Disk through Free-Free Absorption in the Nucleus of 3C 84 with KaVA and KVN at 43 and 86 GHz
• VERA monitoring of the radio jet 3C 84 during 2007--2013: detection of non-linear motion
• Exploring the Variability of the Flat Spectrum Radio Source 1633+382. II: Physical Properties
• Origin of the UV to X-ray emission of radio galaxy NGC 1275 explored by analyzing its variability
• Fossil shell in 3C 84 as TeV $\gamma$-ray emitter and cosmic-ray accelerator
• Two active states of the narrow-line gamma-ray-loud AGN GB 1310+487
• Fossil shell emission in dying radio loud AGNs