| Autor: |
Bong Won Sohn, Maria Rioja, Richard Dodson, Do-Young Byun, Mareki Honma, Pablo De Vicente, Seog-Tae Han, Taehyun Jung, Jamie Stevens |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Journal of The Korean Astronomical Society. 48:277-284 |
| ISSN: |
1225-4614 |
| DOI: |
10.5303/jkas.2015.48.5.277 |
| Popis: |
We present our efforts for extending the simultaneous multi-frequency receiver system of the Korean Very Long Baseline Interferometry (VLBI) Network (KVN) to global baselines in order to measure the frequency-dependent position shifts in Active Galactic Nuclei (AGN) jets, the so called core shift effect, with an unprecedented accuracy (a few micro-arcseconds). Millimeter VLBI observations with simultaneous multi-frequency receiver systems, like those of the KVN, enable us to explore the innermost regions of AGN and high precision astrometry. Such a system is capable of locating the frequency dependent opacity changes accurately. We have conducted the feasibility test-observations with the interested partners by implementing the KVN-compatible systems. Here we describe the science case for measuring the core shift effect in the AGN jet and report progress and future plans on extending the simultaneous multi-frequency system to global baselines. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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