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EVN imaging of methanol masers towards massive protostars Anna Bartkiewicz Marian Szymczak

EVN imaging of methanol masers towards massive protostars Anna Bartkiewicz Marian Szymczak Huib Jan van Langevelde 8th EVN Symposium Torun 2006. The ring G23.657-00.127:. Ellipse: e=0.38 133 mas x 123 mas i.e. 1400 AU x 1300 AU at 10.5 kpc or 700 AU x 630 AU at 5.1 kpc.

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EVN imaging of methanol masers towards massive protostars Anna Bartkiewicz Marian Szymczak

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  1. EVN imaging of methanol masers towards massive protostars Anna Bartkiewicz Marian Szymczak Huib Jan van Langevelde 8th EVN Symposium Torun 2006

  2. The ring G23.657-00.127: Ellipse: e=0.38 133 mas x 123 mas i.e. 1400 AU x 1300 AU at 10.5 kpc or 700 AU x 630 AU at 5.1 kpc

  3. A disc at i=67 deg? Vlsr=Vrot * cos i * cos A A(deg)

  4. 12.2 GHz 6.7 GHz VLBA observations on November 2005: ?

  5. IRAS 2MASS MSX 540 K and 80 K (Walsh et al. 1999)

  6. Arc-like sources: G24.541+00.312 & G23.707-00.198 370 (750) AU 370 (560) AU

  7. Model by Moscadelli, Cesaroni & Rioja, 2000

  8. Complex distribution:

  9. Conclusions: • new structures of 6.7 GHz methanol masers were • detected at maps with milliarcsecond resolution (esp. ring), • the arc-like masers were explained well by the bipolar • outflow model, • complex structures arose likely through propagation of • a few shock fronts driven by protostars. • Future work: • further investigation of the ring G23.657-00.127 including • proper motion studies and measurements of the parallax, • high resolution studies of radio continuum and infrared • counterparts.

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