Two new spectra of SDSS J2320+0024 reveal a changing double-peaked Mg II profile that the authors model as a 278-day subparsec binary supermassive black hole, a rare compact candidate.
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Time Evolution of Mg II in SDSS J2320+0024: Implications for a Subparsec Binary Supermassive Black Hole System
Two new spectra of SDSS J2320+0024 reveal a changing double-peaked Mg II profile that the authors model as a 278-day subparsec binary supermassive black hole, a rare compact candidate.