OH Satellite Line Masers and an Active Galactic Nucleus Candidate in M82
OH Satellite Line Masers and an Active Galactic Nucleus Candidate in M82
复制标题
OH 卫星线微波激射器和 M82 中的活跃星系核候选者
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
D. Frail
中科院分区：
文献类型：
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作者：
E. Seaquist;D. Frayer;D. Frail
We report the detection of OH satellite line masers at 1720 and 1612 MHz from the nuclear region of the starburst galaxy M82. The observations were aimed at detecting 1720 MHz maser emission from the known radio-emitting supernova remnant in the nuclear region. At 1720 MHz we detect six features above the 5 σ limit set by noise, four in emission and two in absorption. Three of the emission features appear closely associated with known discrete continuum radio sources, and one of the absorption features is precisely coincident with the discrete continuum source 44.01+59.6. The latter source also exhibits strong 1612 MHz emission at the same velocity. No other 1612 MHz features were detected. All of the 1720 MHz emission features are consistent with masers pumped by collisions with molecular hydrogen at densities between 103 and 105 cm-3 and Tk between 50 and 250 K. The absorption and emission associated with the two satellite lines in 44.01+59.6, together with other evidence, points to the possibility that this source is the active galactic nuclei in M82.
