VEDA: VERA data analysis software for VLBI phase-referencing astrometry

Autor:	Tomoharu Kurayama, Tomoya Hirota, Yukitoshi Kan-ya, Yuuki Adachi, Mareki Honma, Takumi Nagayama, Yoshiaki Tamura
Rok vydání:	2020
Předmět:	Physics 010308 nuclear & particles physics Space and Planetary Science 0103 physical sciences Very-long-baseline interferometry Phase (waves) Astronomy Analysis software Astronomy and Astrophysics Astrometry 010303 astronomy & astrophysics 01 natural sciences
Zdroj:	Publications of the Astronomical Society of Japan. 72
ISSN:	2053-051X 0004-6264
Popis:	We present the VEra Data Analyzer (VEDA) software package for Very Long Baseline Interferometry (VLBI) phase-referencing observations and parallax measurements. The Japanese VLBI project VLBI Exploration of Radio Astrometry (VERA) provides high-precision astrometric results at the 10 μas level. To achieve this precision, accurate calibration of the atmospheric phase fluctuation, the instrumental phase, and the source structural effect is required. VEDA specializes in phase-referencing data analysis, including these calibrations. In order to demonstrate its performance we analyzed H2O maser observations of W 3(OH) and Orion KL with VERA. Their parallaxes were obtained to be 0.527 ± 0.016 mas and 2.459 ± 0.029 mas, respectively. We also analyzed their data using AIPS, which is widely used for VLBI data analysis, and confirmed that the parallaxes obtained using VEDA and AIPS are coincident within 10 μas. VEDA is available for high-precision parallax and proper motion measurements of Galactic maser sources.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e8dbe5a4e3f153efbb3a206f2473c39f https://doi.org/10.1093/pasj/psaa044 Zobrazit plný text záznamu