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The Distribution of H_2O Maser Emission in the Nucleus of NGC 4945

机译:NGC 4945核中H_2O Maser发射的分布

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摘要

We present the first interferometer map of the H2O maser emission in the active nucleus of NGC 4945, which exhibits both starburst and Seyfert qualities. Although the declination of the galaxy is -49 deg, we were able to make the observations with the southernmost antennas of the Very Long Baseline Array. Strong maser emission is present in three velocity ranges, one near the systemic velocity and two shifted roughly symmetrically by + -(100150) km s~-1. This is the first detection of highly blueshifted water emission in NGC 4945.
机译:我们展示了NGC 4945活性核中H2O maser发射的第一个干涉仪图,该图同时显示了星爆质量和塞弗特质量。尽管银河系的偏角是-49度,但我们能够使用甚长基线阵列的最南端天线进行观测。在三个速度范围内都存在强烈的maser发射,一个接近系统速度,另外两个大致对称地偏移+-(100150)km s〜-1。这是NGC 4945中首次检测到高度蓝移的水排放。

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