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Effects of the turbulent ISM on radio observations of quasars

Effects of the turbulent ISM on radio observations of quasars. Krisztina Éva Gabányi S. Britzen, T.P. Krichbaum, U. Bach, L. Fuhrmann, A. Kraus, A. Witzel, J.A. Zensus (MPIfR, Bonn, Germany). Intraday Variability Scatter-broadening and Intraday Variability in B2005+403. Outline.

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Effects of the turbulent ISM on radio observations of quasars

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  1. Effects of the turbulent ISM on radio observations of quasars Krisztina Éva Gabányi S. Britzen, T.P. Krichbaum, U. Bach, L. Fuhrmann, A. Kraus, A. Witzel, J.A. Zensus (MPIfR, Bonn, Germany)

  2. Intraday Variability Scatter-broadening and Intraday Variability in B2005+403 Outline

  3. δ=20-1000 VLBI observations: δ<50 IntraDay Variability • 20%-25% of flat spectrum extragalactic radio sources show IDV • Peak-to-peak variations: few percent in total intensity, 20%-100% in polarization • Variations strongly frequency dependent • Timescale: • Type I: >2 days • Type II: < 2 days • Fast: less than an hour

  4. B2005+403 • Flat spectrum quasar • Redshift: 1.736 • Located behind the Cygnus super-bubble region l=76.82°, b=4.29° VLBA 22 GHz 2003.04 Fey et al., 1989 8.55 pc Gabányi et al., 2006

  5. 20 mas 1 mas Scatter-broadening VLBA+EB 43 GHz 1996.73 Beamsize: 0.6 mas EVN 1.67 GHz 1998.14 Beamsize: 13 mas

  6. θ~ν-1.91±0.05 Scattering Measure=0.43±0.04 m-20/3kpc Non-Kolmogorov or Inner scale≥8000 km θ~ν-0.31±0.07 Gabányi et al., 2006 Scatter-broadening

  7. ~ 2.4 kpc (Cordes & Lazio, 2006) 22 GHz Scatter-broadening 1.67 GHz

  8. ~ 2.4 kpc (Cordes & Lazio, 2006) 1.67 GHz 22 GHz Scatter-broadening IDV observation • m~1 % at 1.6 GHz • Timescale ~ 1 day • quenched scintillations 1.67 GHz

  9. ~ 2.4 kpc (Cordes & Lazio, 2006) 1.67 GHz 40 pc > at 8 GHz v: 220 - 47 km/s, t: 12 - 52 days 22 GHz Scatter-broadening IDV observation • m~1 % at 1.6 GHz • Timescale ~ 1 day • quenched scintillations 1.67 GHz

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