A Brightest Cluster Galaxy with an Extremely Large Flat Core

  title={A Brightest Cluster Galaxy with an Extremely Large Flat Core},
  author={Marc Postman and Tod R. Lauer and Megan Donahue and Genevieve J. Graves and Dan Coe and John Moustakas and Anton M. Koekemoer and Larry D. Bradley and Holland Cole Ford and Claudio Grillo and Adi Zitrin and Doron Lemze and Tom Broadhurst and Leonidas A. Moustakas and Bego{\~n}a Ascaso and Elinor Medezinski and Daniel D Kelson},
  journal={The Astrophysical Journal},
Hubble Space Telescope images of the galaxy cluster A2261, obtained as part of the Cluster Lensing And Supernova survey with Hubble, show that the brightest galaxy in the cluster, A2261-BCG, has the largest core yet detected in any galaxy. The cusp radius of A2261-BCG is 3.2 kpc, twice as big as the next largest core known, and ~3 × bigger than those typically seen in the most luminous brightest cluster galaxies. The morphology of the core in A2261-BCG is also unusual, having a completely flat… Expand

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