NGC 5195 in M51: Feedback `Burps' after a Massive Meal?
Abstract
We describe a double-arc-like X-ray structure lying ∼15-30'' (~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. We interpret the arcs as episodic outbursts from the central super-massive black hole (SMBH). The arcs are radially spaced by ~15'' (~1$ kpc), but are rotated relative to each other by ~30°, requiring episodic activity. We also find aslender Hα-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 Hα-emitting material from the galaxy core.Star formation may have commenced in that arc. Hα 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 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 observation has implications for SMBH feedback and the subsequent galaxy evolution.
- Publication:
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American Astronomical Society Meeting Abstracts #227
- Pub Date:
- January 2016
- Bibcode:
- 2016AAS...22711804S