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A brief summary on activties related to rapid variability Bonn Team Urumqi Team

A brief summary on activties related to rapid variability Bonn Team Urumqi Team. Nanshan 25m radio telescope of the Urumqi radio observatory (NAO-CAS), China. located 70 km south of Urumqi City, capital of the province of Xinjiang h= 2029 m long: 87:10:48E, lat: +43:28:12

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A brief summary on activties related to rapid variability Bonn Team Urumqi Team

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  1. A brief summary on activties related to rapid variability Bonn Team Urumqi Team

  2. Nanshan 25m radio telescope of the Urumqi radio observatory (NAO-CAS), China located 70 km south of Urumqi City, capital of the province of Xinjiang h= 2029 m long: 87:10:48E, lat: +43:28:12 Alt-AZ mounting, Cassegrain focus D=25m, rms ~ 0.4mm equipped with 6cm receiver built by the MPIfR: f0= 4850 MHz, dual circ. polarisation B= 600 MHz Tsys = 22 K (including sky) beam: 9.5' SEFD: 210 K (for VLBI)

  3. J1128+592 April 2006 5 GHz 1 day

  4. Annual modulation of the variability timescale = Motion through the scintillation pattern projected on the Earth´s orbit J1819+3845 vE =30 km/s, qscatt=0.1 mas, Ds =100 pc, Þtvar =14 hrs image: Fuhrmann@MPIfR other: J1128+59, 1257-32, 1519-27, 0917+62?, 0954+65? Dennett-Thorpe & deBruyn 2000, 2002

  5. Annual Modulation in J1128+592 Isotropic model Velocity of the screen: vra~ -10 (±2) km/s vdec~ -10 (±3) km/s Velocity of the screen: vra~ -5 (±8) km/s vdec~ -12 (±2) km/s Axial ratio of the anisotropy: R~ 4 Angle of the anisotropy: ~ -88º Anisotropic model

  6. 100m Effelsberg VLBA 5 GHz VLBA 8 GHz 25m Urumqi Annual Modulation in J1128+592 Orientation of polarized jet: PA = -106° ± 4° Separation: ~1.5 mas J1128+592 5 GHz Anisotropic scintillation: θ = -90° ± 1° Vra = -1 ± 7 km/s Vdec = -11 ± 1.5 km/s r = 5 ± 2 s = (1.3 ± 0.3) 106 km Gabanyi et al. 2009

  7. VLBI jet VLBI core Difference between core and jet EVPA: simultaneous variations suggest common foreground screen ! Variation of RM of core and jet (high statistical significance) Gabanyi et al. 2009

  8. Gabanyi et al. 2009 Is the variation of the RM related to the orbital motion of the Earth and the annual modulation of the IDV pattern ?

  9. Annual modulation also in S5 0716+714 ? Marchili et al. 2010

  10. Coordinated Effelsberg – Urumqi IDV campaign in February 2009

  11. Ur+EB February 2009 6cm

  12. RM of 0716+71 ill defined new data from Effelsberg Feb. 2009 RM of 3C48 well defined

  13. IRAS 100 micron IDV foreground studies map made by W.+P. Reich

  14. Loop III ?? A possible correlation of IDV sources with regions of enhanced RM ? RM map: Sun, Reich, Waelkens, Enßlin, AA, 2007 (astro-ph 0711.1572) Han et al. 2008, in prep. IDV catalogue: Fuhrmann et al.2004, Lovell et al. 2003

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