Home > 国立天文台談話会 > 2019.10.21-2019.1027


10月23日(水)16:00~17:00 談話会  大セミナー室  
Oct 23 Wed          NAOJ seminar  Large Seminar Room



NAOJ seminar
Regularly Scheduled/Sporadic
Date and time
October 23rd, 2019, 16:00 -17:00
Large Seminar Room
Gabor Orosz
University of Tasmania
SPIRALS: Southern Parallax Radio Astrometry Legacy Survey
What does the Milky Way look like? Little progress on the structure of the Milky Way has been made using optical telescopes, as interstellar dust is ubiquitous and absorbs the light from distant stars. However, radio emission from maser sources in star forming regions provide perfect targets to measure their trigonometric parallax using very long baseline interferometry (VLBI). Trigonometric parallax is the “gold standard” for distance measurement in astronomy, with current techniques allowing for accuracies of tens of microarcseconds to measure reliable distances across the whole Milky Way Galaxy.

VLBI trigonometric parallaxes of maser sources is what allowed the Japanese VERA project and the BeSSeL project (using the VLBA) to map the structure of the Mikly Way Galaxy visible from northern latitudes. However, progress in the southern hemisphere has long been hindered by the lack of VLBI infrastructure. Over the last few years, the University of Tasmania has been in the middle of building a VLBI array that is partially designed to carry out the remaining part of the mapping of our Galaxy: the Southern Parallax Radio Astrometry Legacy Survey (SPIRALS). Science operations of SPIRALS is scheduled to start at the end of this year.

In my talk, I would like to give a whole picture of SPIRALS project: I would introduce our telescope designs, the novel recording setups and data correlation, results from recent astrometric tests and the science motivation and timeline. I also aim to compare our specialized VLBI network and SPIRALS to that of the VERA array and its large internal project, to show the similarities and differences in implementation. The talk would showcase results from our whole group here in Tasmania and hopefully provide clear avenues of collaboration possibilities with the well established Japanese parallax community.

-Name: Narukage, Noriyuki

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