Interferometric Monitoring of Gamma-ray Bright Active Galactic Nuclei II: Frequency Phase Transfer

Abstract

The Interferometric Monitoring of Gamma-ray Bright Active galactic nuclei (iMOGABA) program provides not only simultaneous multifrequency observations of bright gamma-ray detected active galactic nuclei (AGN), but also covers the highest Very Large Baseline Interferometry (VLBI) frequencies ever being systematically monitored, up to 129 GHz. However, observation and imaging of weak sources at the highest observed frequencies is very challenging. In the second paper in this series, we evaluate the viability of the frequency phase transfer technique to iMOGABA in order to obtain larger coherence time at the higher frequencies of this program (86 and 129 GHz) and image additional sources that were not detected using standard techniques. We find that this method is applicable to the iMOGABA program even under non-optimal weather conditions.

19 pages, 4 tables, 10 figures, accepted for publication in JKAS

References in corpus (7)

• Fermi Large Area Telescope Bright Gamma-ray Source List
• Turbulent, Extreme Multi-Zone Model for Simulating Flux and Polarization Variability in Blazars
• On the relation between AGN gamma-ray emission and parsec-scale radio jets
• A Global 86GHz VLBI Survey of Compact Radio Sources
• Radio/gamma-ray time delay in the parsec-scale cores of active galactic nuclei
• VLBI observations of bright AGN jets with KVN and VERA Array (KaVA): Evaluation of Imaging Capability
• Verification of the Astrometric Performance of the Korean VLBI Network, using comparative SFPR studies with the VLBA at 14/7 mm

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• Exploring the Nature of the 2016 γ-ray Emission in the Blazar 1749+096
• Interferometric Monitoring of Gamma-ray Bright AGNs: S5 0716+714
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• Multiwavelength study of the gravitationally lensed blazar QSO B0218+357 between 2016 and 2020
• Shared-optical-path VLBI frequency phase transfer from 86 to 258 GHz on an 8600 km baseline: Demonstrated with the APEX and IRAM 30 m telescopes