科研之友
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摘要
We describe a double-arc-like X-ray structure lying similar to 15 ''-30 '' (similar to 0.8-1.7 kpc) south of the NGC 5195 nucleus, visible in the merged exposures of long Chandra pointings of M51. The curvature and orientation of the arcs argues for a nuclear origin. The arcs are radially separated by similar to 15 '' (similar to 1 kpc), but are rotated relative to each other by similar to 30 degrees. From an archival image, we find a slender H alpha-emitting region just outside the outer edge of the outer X-ray arc, suggesting that the X-ray-emitting gas plowed up and displaced the H alpha-emitting material from the galaxy core. Star formation may have commenced in that arc. H alpha emission is present at the inner arc, but appears more complex in structure. In contrast to an explosion expected to be azimuthally symmetric, the X-ray arcs suggest a focused outflow. We interpret the arcs as episodic outbursts from the central super-massive black hole (SMBH). We conclude that NGC 5195 represents the nearest galaxy exhibiting on-going, large-scale outflows of gas, in particular, two episodes of a focused outburst of the SMBH. The arcs represent a clear demonstration of feedback.
- 出版日期2016-6-1
