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Unusual properties of the methanol maser emission in W48

Published online by Cambridge University Press:  03 August 2017

Irina E. Val'tts  and
Stella Yu. Lyubchenko
Irina E. Val'tts
Affiliation:
Astro Space Center of the Lebedev Physical Institute, Russian Academy of Sciences, Profsoyuznaya str. 84/32, Moscow 117810, Russia
Stella Yu. Lyubchenko
Affiliation:
Astro Space Center of the Lebedev Physical Institute, Russian Academy of Sciences, Profsoyuznaya str. 84/32, Moscow 117810, Russia

Abstract

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In the star forming region W48 the spectrum of methanol lines is studied. It is found that the intensity of the 20 − 3−1E (12.2 GHz) line anti-correlates with the intensity of the 51-60A+ (6.7 GHz). All other class II methanol lines in the spectrum of W48 (21 − 30A+ (157 GHz), 31 − 40A+ (107 GHz) (possibly) and J0 - J−1E (157 GHz)) demonstrate the same behaviour as 20 − 3−1E (12.2 GHz) line. This fact contradicts to the current models of the class II methanol maser emission. The effect is confirmed in the sample of 67 sources. For the explanation of this fact some possibilities are considered.

Type
Part 1. Star Formation
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 167 - 170
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

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