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

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.

preprint2013arXivOpen access
Meagan LangKelly Holley-BockelmannTamara BogdanovicPau Amaro-SeoaneAlberto SesanaManodeep Sinha
astro-ph.COastro-ph.GA
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Meagan LangKelly Holley-BockelmannTamara BogdanovicPau Amaro-SeoaneAlberto SesanaManodeep Sinha

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