THE COMPLEX NORTH TRANSITION REGION OF CENTAURUS A: A GALACTIC WIND
THE COMPLEX NORTH TRANSITION REGION OF CENTAURUS A: A GALACTIC WIND
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半人马座 A 复杂的北过渡区：银河风
DOI：
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
F. Owen
中科院分区：
文献类型：
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作者：
S. Neff;J. Eilek;F. Owen
我们展示了半人马座 A 的母星系 NGC 5128 的深部 GALEX 图像。我们检测到一条引人注目的远紫外 (FUV) 和 Hα 发射“天气带”，该带向星系东北部延伸超过 35 kpc。该带与无线电/X射线发射的多节脊相关联，并且是先前已知的光学发射线细丝串的延伸。该地区的许多现象都太短暂，无法在从内星系传输时幸存下来。一定有什么东西在本地推动着他们。我们还检测到银河系中央尘埃带的远紫外发射。结合之前的无线电和远红外测量结果，我们推断出中央星系中存在活跃的星暴，该星暴目前正在 ∼2 M☉ yr−1 处形成恒星，并且这种情况已经持续了 50-100 Myr。如果来自活动星系核的能量和质量增强了星暴产生的风，那么强大的增强风可以成为北方天气系统所需的驱动力。我们认为，不同的天气系统以及同一地区无线电发射的增强都是由于风与 NGC 5128 历史上最近的合并/相遇事件之一留下的冷气体相遇造成的。
We present deep GALEX images of NGC 5128, the parent galaxy of Centaurus A. We detect a striking “weather ribbon” of far-UV (FUV) and Hα emission which extends more than 35 kpc northeast of the galaxy. This ribbon is associated with a knotty ridge of radio/X-ray emission and is an extension of the previously known string of optical emission-line filaments. Many phenomena in the region are too short-lived to have survived transit out from the inner galaxy; something must be driving them locally. We also detect FUV emission from the galaxy’s central dust lane. Combining this with previous radio and far-IR measurements, we infer an active starburst in the central galaxy which is currently forming stars at ∼2 M☉ yr−1, and has been doing so for 50–100 Myr. If the wind from this starburst is enhanced by energy and mass driven out from the active galactic nucleus, the powerful augmented wind can be the driver needed for the northern weather system. We argue that both the diverse weather system, and the enhanced radio emission in the same region, result from the wind’s encounter with cool gas left by one of the recent merger/encounter events in the history of NGC 5128.
半人马座北部中射电瓣中的喷射加热 X 射线细丝
DOI：
10.1088/0004-637x/698/2/2036
发表时间：
2009
期刊：
The Astrophysical Journal
影响因子：
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作者：
Kraft R
通讯作者：
Kraft R