GENJI Programme: Gamma-ray Emitting Notable AGN Monitoring by Japanese VLBI

Abstract

We introduce the GENJI program (Gamma-ray Emitting Notable AGN Monitoring by Japanese VLBI), which is a monitoring program of gamma-ray bright AGNs with the VERA array (VLBI Exploration of Radio Astrometry). The GENJI programme aims a dense monitoring at 22 GHz towards the $\gamma$-ray emitting active galactic nuclei (AGNs) to investigate the radio time variation of the core and possible ejection of new radio component, motion of jets, and their relation with the emission at other wavelengths especially in $\gamma$-rays. Currently we are monitoring 8 $\gamma$-ray-emitting notable AGNs (DA 55, 3C 84, M 87, PKS 1510-089, DA 406, NRAO 530, BL Lac, 3C 454.3) about once every two weeks. This programme is promising to trace the trend of radio time variation on shorter timescale than conventional VLBI monitoring programme and to provide complimentary data with them (e.g., MOJAVE, Boston University Blazar Project). In particular, we successfully coordinated quick follow-up observations after the GeV $\gamma$-ray flare in NRAO 530 and 3C 454.3 reported by the Fermi Gamma-ray Space Telescope. Here we present the initial results of morphology and light curves for the first 7-month operation.

arXiv comment15 pages, 13 figures, accepted for publication in PASJ

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Cited by in corpus (15)

• Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign
• A strong radio brightening at the jet base of M87 during the elevated very-high-energy gamma-ray state in 2012
• Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy gamma-rays
• Relativistic electrons and magnetic field of the M87 jet on ~ten Schwarzschild radii scale
• VLBI observations of bright AGN jets with KVN and VERA Array (KaVA): Evaluation of Imaging Capability
• Broadband Multi-wavelength Properties of M87 during the 2018 EHT Campaign including a Very High Energy Flaring Episode
• Interferometric Monitoring of Gamma-ray Bright AGNs I: Results of Single-epoch Multifrequency Observations
• VERA monitoring of the radio jet 3C 84 during 2007--2013: detection of non-linear motion
• An International Survey of Front-End Receivers and Observing Performance of Telescopes for Radio Astronomy
• VLBI observations of the G25.65+1.05 water maser superburst
• PAGaN II: The Evolution of AGN Jets on Sub-Parsec Scales
• Probing Precise Location of Radio Core in TeV Blazar Mrk 501 with VERA at 43 GHz
• The Bulk Flow Velocity and Acceleration of the Inner Jet in M\,87
• VLBI Monitoring of the Sub-parsec-scale Jet in the Radio Galaxy 3C 66B at 22 GHz
• On the connection between radio and gamma rays. Variability and polarization properties in relativistic jets