Detection of three new methanol maser transitions toward star-forming regions

Details Detection of three new methanol maser transitions toward star-forming regions Detection of three new methanol maser transitions toward star-forming regions

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..330h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 330-335.

Astronomy and Astrophysics

Astrophysics

22

H Ii Regions, Interstellar Masers, Methyl Alcohol, Molecular Spectra, Star Formation, Microwave Spectra, Millimeter Waves, Molecular Energy Levels, Orion Constellation, Very Long Base Interferometry

Scientific paper

By using the Haystack 37 m antenna, a discovery was made of maser emission in the 7(-2)-8(-1)E, 6(2)-5(3)A(-), and 6(2)-5(3)A(+) transitions of interstellar methanol. All three lines were detected toward the compact H II regions W3(OH) and NGC 6334-F. Toward the latter source intensities in excess of 100 Jy are observed in all three transitions. Masers in the 7(-2)-8(-1)E line were detected in three additional sources. All sources toward which maser action was found are associated with compact H II regions and are known to show strong maser emission in the 12.2 GHz 2(0)-3(-1)E line of methanol at similar velocities. For this reason the newly detected masers are classified as class B methanol masers. Toward Orion-KL, thermal emission is observed.

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