Can a Satellite Galaxy Merger Explain the Active Past of the Galactic Center?

Details Can a Satellite Galaxy Merger Explain the Active Past of the Galactic Center? Can a Satellite Galaxy Merger Explain the Active Past of the Galactic Center?

2011-07-14

arxiv.org/abs/1107.2923v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

9 pages, 1 figure, submitted to ApJ. Comments are welcome and may be incorporated into the paper with attribution

Scientific paper

Observations of the Galactic Center (GC) have accumulated a multitude of "forensic" evidence indicating that several million years ago the center of the Milky Way galaxy was teaming with starforming and accretion-powered activity -- this paints a rather different picture from the GC as we understand it today. We examine a possibility that this epoch of activity could have been triggered by the infall of a satellite galaxy into the Milky Way which began at the redshift of 10 and ended few million years ago with a merger of the Galactic supermassive black hole with an intermediate mass black hole brought in by the inspiralling satellite.

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