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

Published online by Cambridge University Press:  01 March 2007

A. V. Alakoz ,
V. I. Slysh  and
V. Migenes
A. V. Alakoz
Affiliation:
Astro Space Center, Lebedev Physical Institute, Profsouyzanya 84/32, Moscow, Russia email: [email protected]; [email protected]
V. I. Slysh
Affiliation:
Astro Space Center, Lebedev Physical Institute, Profsouyzanya 84/32, Moscow, Russia email: [email protected]; [email protected]
V. Migenes
Affiliation:
Departamento de Astronomia, Universidad de Guanajuato, Apdo. Postal 144, Guanajuato, CP 36000, GTO Mexico email: [email protected]
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Abstract

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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.

Keywords

ISM: individual (W75 N)masersstars: formationradio lines: ISMISM: moleculesISM: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 186 - 187
Copyright
Copyright © International Astronomical Union 2008

References

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Fish, V.L., Reid, M.J., Argon, A.L., & Zheng, X.-W. 2005, ApJS, 160, 220CrossRefGoogle Scholar
Slysh, V. I., & Migenes, V. 2006, MNRAS 369, 1497CrossRefGoogle Scholar