EAVN observations along with EHT for M87 in 2017
October 02, 2019
October 09, 2019
After the successful combination of VERA in Japan and KVN in Korea (KaVA), the East Asian VLBI Network (EAVN) is now expanding by including Chinese antennas, significantly enhancing the angular resolution and sensitivity. One of the key science goals of EAVN project is to better understand the formation of Active Galactic Nuclei (AGN) jets. In early 2017, we started an intensive EAVN monitoring on the nearby galaxy M87. This source offers a privileged opportunity to probe the jet launching and formation scales thanks to the proximity and large mass of the central black hole. In total we obtained 14 epochs of M87 from March to May 2017 where a number of stations in East Asia joined (so-called the "EAVN campaign 2017"). For the first time, we obtained M87 images with KaVA + Tianma at both 22 and 43 GHz. Moreover, the EAVN campaign 2017 was performed near-in-time to the EHT+ALMA observation of M87. Quasi-simultaneous EAVN observations at the lower frequencies may offer complementary information to properly interpret the EHT images. Here we report some preliminary results on these EAVN observations.
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