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New OH Observations toward Northern Class I Methanol Masers

  • I. E. Val'tts (a1), I. D. Litovchenko (a1), O. S. Bayandina (a1), A. V. Alakoz (a1), G. M. Larionov (a1), D. V. Mukha (a2), A. S. Nabatov (a2), A. A. Konovalenko (a2), V. V. Zakharenko (a2), E. V. Alekseev (a2), V. S. Nikolaenko (a2), V. F. Kulishenko (a2) and S. A. Odincov (a3)...

Abstract

Maser emission of OH(1720) is formed, according to modern concepts, under the influence of collisional pumping. Class I methanol masers (MMI) are also formed by a collisional mechanism of the inversion of the molecular levels. It is not excluded in this case that physical conditions in the condensations of the interstellar medium where masers are formed may be similar for MMI and OH(1720) masers, and they can associate with each other. To establish a possible association between these two kinds of masers, and obtain reliable statistical estimates, a survey of class I methanol masers at a frequency of 1720 MHz has been carried out.

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References

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Caswell, J. L. 2004, A&A, 349, 99
Frail, D. A. 2008, Mem. Soc. Astron. Italiana 75, 282 2011, arXiv:1108.4137v1 [astro-ph.HE]
Hewitt, J. W. & Yusef-Zadeh, F., 2008, ApJ, 683, 189
Litovchenko, I. D., Alakoz, A. V., Valtts, I. E., & Larionov, G. M. 2011, Astronomicheskii Zhurnal 88, 1061
Pihlström, Y. M., Sjouwerman, L. O., & Fish, V. L. 2011, arXiv:1105.4377v1 [astro-ph.GA]
Szymczak, M. & Gerard, E. 2004, A&A, 414, 235
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Keywords

New OH Observations toward Northern Class I Methanol Masers

  • I. E. Val'tts (a1), I. D. Litovchenko (a1), O. S. Bayandina (a1), A. V. Alakoz (a1), G. M. Larionov (a1), D. V. Mukha (a2), A. S. Nabatov (a2), A. A. Konovalenko (a2), V. V. Zakharenko (a2), E. V. Alekseev (a2), V. S. Nikolaenko (a2), V. F. Kulishenko (a2) and S. A. Odincov (a3)...

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