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A study of class II methanol maser condensations in the star-forming region W48

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Abstract

The methanol-line spectra in two maser condensations at velocities ∼41 and ∼45 km/s in the star-forming region W48 have been studied. The intensity of the 20-3−1 E (12.2 GHz) line is anticorrelated with that of the 51-60 A + (6.7 GHz) line: the intensity of the 51-60 A + (6.7 GHz) line is greater at ∼41 km/s than at ∼45 km/s, while the opposite is true of the 20-3−1 E (12 GHz) line. The remaining class II methanol lines in this source demonstrate the same behavior as the 20-3−1 E (12 GHz) line. This contradicts current concepts about the maser line intensities in various methanol transitions: according to model calculations, the intensities of all class II lines should vary in phase. This effect is confirmed for a large homogeneous sample of 67 sources. Possible explanations of the observed effect are proposed; one suggests the possible role of “transpumping” of the methanol-level populations in the maser condensations. The relationships between the variations of the 20-3−1 E (12 GHz) and 51-60 A + (6.7 GHz) line intensities, which are present for all 67 sources considered, may indicate that the condensations are at different distances from the pumping source. The presence of condensations at various distances from the pumping source in all 67 sources can be understood if they are ice planets revolving in different orbits around massive stars or protostars.

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Authors and Affiliations

  1. Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117810, Russia

    I. V. Val’tts & S. Yu. Lyubchenko

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  1. I. V. Val’tts
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  2. S. Yu. Lyubchenko
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__________

Translated from Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 79, No. 4, 2002, pp. 328–344.

Original Russian Text Copyright © 2002 by Val’tts, Lyubchenko.

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Val’tts, I.V., Lyubchenko, S.Y. A study of class II methanol maser condensations in the star-forming region W48. Astron. Rep. 46, 293–308 (2002). https://doi.org/10.1134/1.1471395

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