Status of VERA Tomoya Hirota (NAOJ), on behalf of VERA project - PowerPoint PPT Presentation

Status of VERA Tomoya Hirota (NAOJ), on behalf of VERA project

Contents • Science – Not including KaVA and EAVN; See other presentations • Operation • Maintenance and development • Future plan

Science • 3D structure and dynamics of Milky Way Galaxy based on accurate astrometry at up to 10 m as • Latest results (ver. July 26, 2018) – VERA: 125 sources – VERA+BeSSeL+EVN: 196 – Including >10kpc-sources – R 0 =7.94+/-0.25 kpc SUN – Q 0 =234+/-8 kms -1 • To be completed by 2022 GC March (end of FY2021) Compiled by Nagayama

Science • 3D structure and dynamics of Milky Way Galaxy based on accurate astrometry at up to 10 m as • Latest results (ver. July 26, 2018) – Galactic rotation curve is nearly flat between R=5-15 kpc Compiled by Nagayama

Operation • From September, 2017 to August, 2018 – Total 3840 hours – About 30 sources in 20 schedules for VERA astrometry (maser-reference pairs) every month number time(h) VERA project 294 2001 VERA Common Use 19 166 VERA Geodesy 22 538 JVN 0 0 KaVA project 43 417 KaVA LP 30 211 KaVA Common Use 68 507 Compiled by Shibata

Operation Compiled by Shibata

Operation Compiled by Shibata

Operation Compiled by Shibata

Operation • Total about 15 scientists/engineers/operators/. . . – Mizusawa-based operation group led by Shibata – Local staff in each station • Various duties – AOC operation for regular VLBI observations – Single-dish observations – Correlation – Data analysis with VEDA pipeline – Data check, astrometry analysis, software developments, . . .

Maintenance and development • Keeping the system for stable operation – Led by Ueno • Upgrading the system for new sciences – Regular operation in dual-beam astrometry mode at 4Gbps – Wider-band (12Gbps) for internal observations (Oyama et al.) – Multi-frequency under commissioning (with KASI) – Dual-polarization under commissioning (Hagiwara et al.) – GPU correlator, L/S-band, ultra broad band, . . . (Oyama et al.) – Calibration, astrometry technique (Nagayama, Mikyoung Kim et al.); See poster by D. Sakai

Future plan • From VERA to KaVA, EAVN, global array (e.g TNRT) • Finally SKA and/or SKA+VLBI remote antennas – Registered as SKA pathfinder (July 3 2018) – Led by Kobayashi and Akahori for planning new project in NAOJ

Summary • VERA is keeping (quasi-)steady state but gradually upgrading system performance • VERA science project (Galactic astrometry observations) will be finished by 2022 March (end of FY2021) – This does not mean the end of VERA array • Future plan are under discussion – From VERA to KaVA, EAVN, global array (e.g TNRT) – Finally SKA and/or SKA+VLBI remote antennas