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Japanese VLBI activities and East Asian VLBI Network

Japanese VLBI activities and East Asian VLBI Network . H.Kobayashi(NAOJ) November,23,2011 2011South African SKA, Postgraduate Bursary Conference. March,11,2011 Earthquakes. Antenna were damaged at Mizusawa and Ibaraki . Mizusawa. M9. Fukushima. Ibaraki. Tokyo.

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Japanese VLBI activities and East Asian VLBI Network

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  1. Japanese VLBI activities and East Asian VLBI Network H.Kobayashi(NAOJ) November,23,2011 2011South African SKA, Postgraduate Bursary Conference

  2. March,11,2011Earthquakes • Antenna were damaged at Mizusawa and Ibaraki . Mizusawa M9 Fukushima Ibaraki Tokyo

  3. Ibaraki station has two 32-m telescopes, which were used as Intelsat stations

  4. March 11th Earthquakeeffects Mizusawa(VERA) ; Collision of Elevation gear and housing Ibaraki station damages

  5. Displacement of Mizusawa ~3mdisplacement of the station

  6. 2500 km 5000 km East Asian VLBI Network

  7. Current working VLBI stations in Eastern Asia is 20 ! • Japan(13) • VERA(4), Kashima, Tsukuba, Yamaguchi, Nobeyama, Usuda, Tomakomai,Gifu,Uchinoura, Takahagi, Hitachi • Korea(3) • KVN (3) Yonsei, Ulsan, Tamna • China(4) • Shanghai, Urumqi, Beijin, Kumming • Shanghai 65munder construction

  8. Total effective aperture and baseline length

  9. UV-coverage by EAVN Declination +30 deg. 0 deg. -30 deg.

  10. Observation features • Phase referencing observations • VERA 2 beam • KVN multi-frequency • Nodding -> high sensitivity observations for low Tb objects (RQQ, SNR, Galactic objects) ->astrometry for maser sources (H2O,SiO,CH3OH..) • High dynamic range observations • 8GHz and 22GHz mainly • 86GHz and 129 GHz with 4(+1) stations

  11. Seoul VLBI correlator center 8Gbps x 16 station Largest VLBI correlator Opened on May 13th, 2010

  12. Mark5B KVN/CVN VLBI Data Buffer (VDB2000) Correlation Subsystem 8Gbps 16 stations Data Archive DIR-2000 VERA K-5 JVN Optical Fiber Correlator Control & Operation S/W New Seoul correlator for KVN/EAVN From 2012, operation will be started !

  13. OCTAVE(8Gbps Disc recorder) 2Gbps x 4 10 GbE Hub Disk Server Disk Server Disk Server Disk ServerOCTDISK VSI-H－ 10 GbE Converter OCTAVIA 1 or 2 Gbps ×４ I/O 10 GbE VSI-H 10 GbE Ethernet transmission ２

  14. Science (Dec. 5,2008)

  15. EAVN observtaions • KVN/VERA : Some scientific verification observations are on going. • 22GHz/43GHz mapping • Geodesy • 43GHz SgrA* etc. • CVN(Shanghai)/JVN • Methanol(C band) observations • X band mapping test ?

  16. C band Methannol maser observations by using JVN +CVN(Shanghai) Ibaraki, Shanghai, VERAx4 ○Observations ・DateAug.28and 29 ,2010 ○Results Methanol maser maps of 22 sources Jet/Disk structure and velocity field

  17. Schedule • 2010-2011 • Test Observations with VERA+KVN, JVN+CVN • 2011-2012 • Start of science observations with Japan (VERA,JVN) +Korea (KVN), and Japan(JVN)+China(CVN). • 2013 • Start of science observations with Japan, Korea and China

  18. Constructions of three stations were completed on Dec. 2008 ! Simultaneous Multi-Frequency Obs. -Phase Compensation, mm-VLBI

  19. Receiver Prototype 43 GHz Receiver * 86, 129 GHz Receivers will be installed.

  20. VLBI in China L,C,S/X,K Major Facilities for RA in China S/X L,C(5/6G),S/X,K 21CMA Delingha 13.7m S/X L,C,S/X:2012 Ku,K,Ka:Q:2015 L,C:2012 K :? L,C,X:2014 Yellow:plan

  21. FAST (Five hundred meter Aperture Spherical radio Telescope) ITS-CSCC2008

  22. Taiwan • Project of Submillimeter VLBI • ALMA prototype antenna (12m, ～３０μｒｍｓ） will be moved to Greenland. • 230/350 GHz VLBI • ALMA, SMA, LMT, CARMA・・・・・

  23. Japanese VLBI Network (JVN) • Collaboration • NAOJ (VERA) • Hokkaido, Ibaraki, Tsukuba, Gifu, Osaka-Pref, Yamaguchi, Kagoshima university • JAXA, NICT, GSI • 13 telescopes (11m ~ 64m) • Purpose • A new, characteristic VLBI array • A Base of East-Asian VLBI • Progress • Started in 2004 • Steady Observation in 2005 • First Paper published in 2006 • Observing time ~200 hr/yr • EAVN test observation

  24. First phase variations between 2 beams Honma, et al, 2003 PASJ 55 Fringe phase of W49N,OH43 and difference Allan variance of them

  25. Scientific goal • Astrometry with 10μarcsec. accuracy between background object and galactic object within 2.2 degree separation • Proper motion and parallax measurements • 3D map and velocity field of the Galaxy • Detailed 3D velocity structure of molecular gas around evolved stars and star forming regions

  26. VERA scientific goal • Measurements of distance and proper motions of galactic maser objects (H2O,SiO) • Dynamics of the Galaxy Maser object: luminous point-like objects -> triangulation point of the Galaxy !

  27. Current status of astrometry with VERA Ro = 8.35±0.44kpc

  28. Rotation Curve of Galaxy

  29. KDDI(telecom) passed on Intelsat stations to NAOJ Yamaguchi 32m Ibaraki 32mx2 Cooled C&X band and K band RXs are equipped.

  30. 2500 km 5000 km East Asian VLBI Network

  31. Conclusion East Asian VLBI Network is organizing with Japan, Korea and China. EAVN is comparable array to VLBA and EVN. It has good features for phase referencing and astrometry. From 2012, science array observation with Japan, Korea, and China is expected. VERA has carried out astrometry observations with precise phase referencing VLBI.

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