1. THE APPLICATION OF MULTIVIEW METHODS FOR HIGH-PRECISION ASTROMETRIC SPACE VLBI AT LOW FREQUENCIES
- Author
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Xiaoyu Hong, Yoshiharu Asaki, Richard Dodson, Hiroshi Imai, Zhi-Qiang Shen, and Maria Rioja
- Subjects
instruments [space vehicles] ,Computer science ,Milky Way ,media_common.quotation_subject ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Radio telescope ,Control moment gyroscope ,Pulsar ,Very-long-baseline interferometry ,space vehicles: instruments ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Astrophysics::Galaxy Astrophysics ,media_common ,high angular resolution [techniques] ,Astrophysics::Instrumentation and Methods for Astrophysics ,techniques: high angular resolution ,Astronomy and Astrophysics ,interferometric [techniques] ,Space and Planetary Science ,Sky ,techniques: interferometric ,Orbit (dynamics) ,Parallax ,Astrophysics - Instrumentation and Methods for Astrophysics ,Algorithm - Abstract
High precision astrometric Space Very Long Baseline Interferometry (S-VLBI) at the low end of the conventional frequency range, i.e. 20cm, is a requirement for a number of high priority science goals. These are headlined by obtaining trigonometric parallax distances to pulsars in Pulsar--Black Hole pairs and OH masers anywhere in the Milky Way Galaxy and the Magellanic Clouds. We propose a solution for the most difficult technical problems in S-VLBI by the MultiView approach where multiple sources, separated by several degrees on the sky, are observed simultaneously. We simulated a number of challenging S-VLBI configurations, with orbit errors up to 8m in size and with ionospheric atmospheres consistant with poor conditions. In these simulations we performed MultiView analysis to achieve the required science goals. This approach removes the need for beam switching requiring a Control Moment Gyro, and the space and ground infrastructure required for high quality orbit reconstruction of a space-based radio telescope. This will dramatically reduce the complexity of S-VLBI missions which implement the phase-referencing technique., Comment: Accepted in AJ
- Published
- 2013