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1 results

  • Spectral and VLBI-structure monitoring of an OH maser flare in W75N

  • A. V. Alakoz, V. I. Slysh, V. Migenes
  • Journal:
    Proceedings of the International Astronomical Union / Volume 3 / Issue S242 / March 2007
    Published online by Cambridge University Press:
    01 March 2007, pp. 186-187
    Print publication:
    March 2007
    • Article
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  • We present VLBI and single dish observations of a strong (1000 Jy) OH maser flare at 1665 MHz in the star-forming region W75N. This new flare appeared in 2003, after a 100 Jy flare in 2000. Three major spectral features N1, N2, and N3 were present at all epochs, with N1 declining and N2 increasing in flux density during observations taken in 2003–2006. All three features have strong linear polarization approaching 90%. VLBI maps show that along with the strong features N1-3, many weaker features have appeared within 100 mas of the ultra compact HII region VLA 2. The proper motion of the flare feature N1 was measured: Δα=1.36±0.3; Δδ=-0.3±0.3 mas in 1.75 years, corresponding to a tangential velocity of about 8 km s−1 relative to the rest of the features, and is comparable to the radial velocity range in the VLA 2 disk.