SIMBAD references

2005A&A...434..213E - Astronomy and Astrophysics, volume 434, 213-220 (2005/4-4)

The masers towards IRAS 20126+4104.


Abstract (from CDS):

We present MERLIN observations of OH, water and methanol masers towards the young high mass stellar object IRAS 20126+4104. Emission from the 1665-MHz OH, 22-GHz H2O and 6.7-GHz CH3OH masers is detected and all originates very close to the central source. The OH and methanol masers appear to trace part of a circumstellar disk around the central source. The positions and velocities of the OH and CH3OH masers are consistent with Keplerian rotation around a central mass of ∼5M. The water masers are offset from the OH and CH3OH masers and have significantly changed since they were last observed, but still appear to be associated to the outflow from the source. All the OH masers components are circularly polarised, in some cases reaching 100 percent while some OH components also have linear polarisation. We identify one Zeeman pair of OH masers and the splitting of this pair indicates a magnetic field of strength ∼11mG within ∼0.5'' (850 AU) of the central source. The OH and CH3OH maser emission suggest that the disk material is dense, n>106cm–3, and warm, T>125K and the high abundance of CH3OH required by the maser emission is consistent with the evaporation of the mantles on dust grains in the disk as a result of heating or shocking of the disk material.

Abstract Copyright:

Journal keyword(s): stars: formation - masers - ISM: individual objects: IRAS 20126+4104

Nomenclature: Table 2: [EFG2005] OH N=1, [EFG2005] H2O N=1, [EFG2005] CH3OH N=1. Table 3: [EFG2005] OH JHHMMSS.ssss+DDMMSS.sss N=7+2, [EFG2005] OH RN (Nos R1-R7), [EFG2005] OH LN (Nos L1-L2). Table 4: [EFG2005] OH N (Nos 1-9). Table 5: [EFG2005] H2O JHHMMSS.ssss+DDMMSS.sss N=8 = [EFG2005] H2O N (Nos 1-8).

Simbad objects: 11

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