An Unexpectedly High AGN Fraction in Red Cluster Galaxies

  title={An Unexpectedly High AGN Fraction in Red Cluster Galaxies},
  author={Paul Martini and Daniel D. Kelson and John S. Mulchaey and Scott C. Trager},
  journal={arXiv: Astrophysics},
As part of a program to study the evolution of active galactic nuclei (AGN) in clusters of galaxies, we present our results for Abell 2104. A deep Chandra observation of this massive, z = 0.154 cluster reveals a significant X-ray point source excess over the expectations of blank fields, including eight X-ray counterparts with R<20 mag. Our spectroscopy shows that all six X-ray sources associated with red counterparts are cluster members and their X-ray properties are consistent with all of… 

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  • 1999