DETECTION OF A NEW METHANOL MASER LINE WITH THE KITT PEAK 12 METER TELESCOPE BY REMOTE OBSERVING FROM MOSCOW

A new methanol maser line 6(-1)5(0) E at 133 GHz was detected with the 12 m Kitt Peak radio telescope using a remote observation mode from M oscow. Moderately strong, narrow maser lines were found in DR 21(OH), DR 21-W, OMC-2, M8E, NGC 2264, L379, and W33-Met. The masers have simi lar spectral features in other transitions of methanol E at 36 and 84 GHz and in transitions of methanol A at 44 and 95 GHz. All these are c lass I transitions, and the new masers also belong to class I. In two other methanol transitions near 133 GHz, 5(-2)6(-1)E and 6(2)-7(1) A(), only thermal emission was detected in some sources. Several other s ources with wider lines in the transition 6(-1)-5(0) E also may be mas ers, since they do not show any emission at the two other methanol tra nsitions near 133 GHz. These are NGC 2071, S231, S255, and GGD 27, als o known as class I masers. The ratio of intensities and line widths of the 133 GHz masers and 44 GHz masers is consistent with the saturated maser model, in which the line rebroadening with respect to unsaturat ed masers is suppressed by cross-relaxation due to elastic collisions.