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

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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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Presentation Transcript
slide1

EVN imaging of methanol masers towards

massive protostars

Anna Bartkiewicz

Marian Szymczak

Huib Jan van Langevelde

8th EVN Symposium

Torun 2006

slide2

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

slide3

A disc at i=67 deg?

Vlsr=Vrot * cos i * cos A

A(deg)

slide4

12.2 GHz

6.7 GHz

VLBA observations on November 2005:

?

slide5

IRAS

2MASS

MSX

540 K

and 80 K

(Walsh et al.

1999)

slide9

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.