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A Kiloparsec-scale Stellar Cavity in the Center of A402-BCG May Be Caused by Dynamic Interactions with an Ultramassive Black Hole

  • Authors: Michael McDonald, Gourav Khullar, David Lagattuta, Guillaume Mahler, Shashank Dattathri, Jose M. Diego, Alastair C. Edge, Benjamin Floyd, Michael D. Gladders, Scott A. Hughes, Mathilde Jauzac, Nader Khonji, Gavin Leroy, Richard Massey, Mireia Montes, Priyamvada Natarajan, Michael Reefe, Keren Sharon, Frank van den Bosch, Stepane Werner, Adi Zitrin

Michael McDonald et al 2026 The Astrophysical Journal Letters 1002 .

  • Provider: AAS Journals

Caption: Figure A4.

Chandra observations of A402. Upper panels: large-scale X-ray emission, which exhibits a clearly asymmetric morphology indicative of a recent cluster-scale merger. Middle panels: zoom-in of the X-ray peak, which is significantly offset from the galaxy center and the IR-bright point source. We interpret this as a sloshing core, rather than a point source, suggestive of a recent merger. Bottom panel: zoom-in of a nearby point source, to emphasize the excellent astrometry of these data, indicating that the offset above is not an astrometry error.

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