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VLBI observations of H2O and CH3OH masers in two high-mass YSOs

Published online by Cambridge University Press:  01 March 2007

C. Goddi ,
L. Moscadelli ,
A. Sanna ,
R. Cesaroni  and
V. Minier
C. Goddi
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St. Cambridge, MA 02138, USA
L. Moscadelli
Affiliation:
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
A. Sanna
Affiliation:
Dipartimento di Fisica, Universitá degli Studi di Cagliari, S.P. Monserrato-Sestu Km 0.7, 09042 Cagliari, Italy
R. Cesaroni
Affiliation:
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
V. Minier
Affiliation:
Service d'Astrophysique, DAPNIA/DSM/CEA Saclay, 91191 Gif-sur-Yvette, France
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Abstract

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We have conducted phase-reference VLBI observations of H2O and CH3OH masers toward two high-mass star forming regions, Sh 2-255 IR and AFGL 5142. In Sh 2-255 infrared water masers are aligned along a direction close to the orientation of a large scale H2 jet, tracing possibly shocked material in a precessing jet, or, alternatively, the disk-wind emerging from the disk atmosphere. In AFGL 5142 water masers trace expansion at the base of a protostellar jet, whilst methanol masers are more probably tracing infalling than outflowing gas. Our results suggest that water and methanol masers trace different kinematic structures in the circumstellar gas.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 152 - 153
Copyright
Copyright © International Astronomical Union 2008

References

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