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Journal Articles Publications of the Astronomical Society of Japan Year : 2020

86-GHz SiO masers in Galactic centre OH/IR stars

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1
Maria Messineo
  • Function : Author
Lorant O. Sjouwerman
  • Function : Author
Harm J. Habing
  • Function : Author

Abstract

We present results on a search for 86.243-GHz SiO (J = 2→1, $v$ = 1) maser emission toward 67 OH/IR stars located near the Galactic centre. We detected 32 spectral peaks, of which 28 correspond to SiO maser lines arising from the envelopes of these OH/IR stars. In OH/IR stars, we obtained an SiO maser detection rate of about $40\%$ . We serendipitously detected two other lines from OH/IR stars at ≍86.18 GHz, which could be due to a CCS-molecule transition at 86.181 GHz or probably to an highly excited OH molecular transition at 86.178 GHz. The detection rate of 86-GHz maser emission is found to be about $60\%$ for sources with the Midcourse Space Experiment (MSX) A - E < 2.5 mag; but it drops to $25\%$ for the reddest OH/IR stars with MSX A - E > 2.5 mag. This supports the hypothesis by Messineo (2002, A&A, 393, 115) that the SiO masers are primarily found in relatively thinner circumstellar material.

Dates and versions

insu-03748048 , version 1 (09-08-2022)

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Maria Messineo, Lorant O. Sjouwerman, Harm J. Habing, Alain Omont. 86-GHz SiO masers in Galactic centre OH/IR stars. Publications of the Astronomical Society of Japan, 2020, 72, ⟨10.1093/pasj/psaa040⟩. ⟨insu-03748048⟩
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