Korean VLBI Network (KVN)

KVN Recent News

Single-epoch results of a KVN KSP: iMOGABA

The iMOGABA program continues to aim at revealing the origins of the gamma-ray flares that are often detected in AGNs. One of the observing sessions in the program was conducted in 2013 on November 19 and 20, yielding 32 sources that were detected and imaged at all frequency bands with or without the use of the FPT technique. The first 129 GHz VLBI images were made from most of the sources, establishing a 129 GHz VLBI image database with a size of 32 sources. Thanks to simultaneous multifrequency VLBI observations, we are able to investigate the spectral properties, free from any source variability. We find that the sources become fainter at higher frequencies, yielding optically thin spectra at mm wavelengths.

KVN joined scientific observations of EAVN

Scientific operation of the EAVN (East Asia VLBI Network) has started in 2017. After the commissioning in 2016, the EAVN conducted a series of 17 scientific observatinos at 22/43GHz of M87 and SgrA* between 2017 March and May, some of which were in synchronized with EHT-ALMA 230 GHz VLBI campaign. KVN joined these EAVN observations together with Sejong (Korea), VERA (Japan), Tianma and Urumqi (China), and other EVAN telescopes.

Commissioning of 130 GHz VLBI polarization observation

A KVN KSP (PAGaN) team, led by Prof. Trippe, S. (Seoul National University), has successfully obtained high resolution linear polarization images of AGNs using KVN at 130 GHz by correcting for the instrumental polarization effect from KVN polarization observations. The instrumental leakage term (D-term) is measured to be about 10% at 130 GHz.

Research Infomation

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Korean VLBI Network (KVN)