2017
DOI: 10.3847/1538-3881/153/3/105
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MultiView High Precision VLBI Astrometry at Low Frequencies

Abstract: The arrival of the Square Kilometer Array (SKA) will revitalise all aspects of Very Long Baseline Interferometry (VLBI) astronomy at the lower frequencies. In the last decade there have been huge strides towards routinely achieving high precision VLBI astrometry at frequencies dominated by the tropospheric contributions, most notably at 22GHz, using advanced phase referencing techniques. Nevertheless to increase the capability for high precision astrometric measurements at low radio frequencies (<8 GHz) an eff… Show more

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Cited by 50 publications
(72 citation statements)
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“…This multi-frequency approach is one of two methods we are currently developing to improve astrometric calibration of the ionospheric contributions, the other being to use multiple calibrators around the target and to solve for the spatial structure of the atmosphere, which we call MultiView (Rioja et al , 2016. This method, which requires more calibrators rather than less, simultaneously solves for a 2D Ionospheric and Tropospheric phase screen over the array, and will be extremely suitable for VLBI stations with multiple beams, such as SKA and ASKAP.…”
Section: Discussionmentioning
confidence: 99%
“…This multi-frequency approach is one of two methods we are currently developing to improve astrometric calibration of the ionospheric contributions, the other being to use multiple calibrators around the target and to solve for the spatial structure of the atmosphere, which we call MultiView (Rioja et al , 2016. This method, which requires more calibrators rather than less, simultaneously solves for a 2D Ionospheric and Tropospheric phase screen over the array, and will be extremely suitable for VLBI stations with multiple beams, such as SKA and ASKAP.…”
Section: Discussionmentioning
confidence: 99%
“…This makes it possible to fully compensate for the spatial static component of the ionosphere, even with calibrators several degrees away. We demonstrated this technique in Rioja et al (2017), achieving complete atmospheric mitigation and effectively reaching the thermal noise limit in our measurements. We plan to further develop and test these techniques to support our mentioned science goals.…”
Section: Discussionmentioning
confidence: 81%
“…For the target scans, antennas were pointed halfway between the OH maser and C ib positions, except for Epochs I-II of the WX Psc sessions, where the pointing center was the OH maser source. Rioja et al 2017, but not related to this work). The on-source time on the target was decreased to 40%; the switching cycle to C 1 (and two other calibrators) was decreased to 5 min and the IF bandwidths were increased to 8 MHz (256 Mbps recording rate), but keeping the same spectral resolution.…”
Section: Observationsmentioning
confidence: 99%
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“…The MultiView calibration method offers the potential to achieve precision astrometry for many targets at the low frequency regime dominated by ionospheric disturbances. MultiView VLBI has been reviewed elsewhere [7] (see also [23] and [24]), and here we only summarize the method and benefits. It consists of using observations of (at least) three calibrators surrounding the target, and uses a 2D interpolation in the visibility domain to provide corrections of the spatial atmospheric distortions along the direction of the target.…”
Section: Multiview Astrometric Methods and Demonstration With Existingmentioning
confidence: 99%