Omar López-Cruz
The Ultramassive Black Hole in the cD Galaxy Holm 15A: The Cosmic Blender
Our new study of the cD galaxy Holm 15A, the BCG in Abell 85, has successfully recovered our previously reported large cusp radius of over 4 kpcs, validating our earlier findings. By combining Subaru imaging with IFU spectroscopy from VLT+MUSE and GTC+MEGARA, we have measured a flat metallicity gradient covering the core region. We propose that large core and the flat metallicity gradient are produced by the core scouring mechanism due to the merging of two or three SMHBs.
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The Ultramassive Black Hole in the cD Galaxy Holm 15A: The Cosmic Blender