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- W3100486880 endingPage "129" @default.
- W3100486880 startingPage "129" @default.
- W3100486880 abstract "Supermassive black hole binaries (SMBHs) are expected to result from galaxy mergers, and thus are natural byproducts (and probes) of hierarchical structure formation in the universe. They are also the primary expected source of low-frequency gravitational wave emission. We search for binary BHs using time-variable velocity shifts in broad Mg ii emission lines of quasars with multi-epoch observations. First, we inspect velocity shifts of the binary SMBH candidates identified in Ju et al., using Sloan Digital Sky Survey spectra with an additional epoch of data that lengthens the typical baseline to ∼10 yr. We find variations in the line of sight velocity shifts over 10 yr that are comparable to the shifts observed over 1–2 yr, ruling out the binary model for the bulk of our candidates. We then analyze 1438 objects with eight-year median time baselines, from which we would expect to see velocity shifts >1000 from sub-parsec binaries. We find only one object with an outlying velocity of 448 , indicating—based on our modeling—that ≲1% (the value varies with different assumptions) of SMBHs that are active as quasars reside in binaries with ∼0.1 pc separations. Binaries either sweep rapidly through these small separations or stall at larger radii." @default.
- W3100486880 created "2020-11-23" @default.
- W3100486880 creator A5008915976 @default.
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- W3100486880 creator A5039811932 @default.
- W3100486880 creator A5060218416 @default.
- W3100486880 creator A5088650111 @default.
- W3100486880 date "2017-01-09" @default.
- W3100486880 modified "2023-09-30" @default.
- W3100486880 title "SEARCHING FOR BINARY SUPERMASSIVE BLACK HOLES VIA VARIABLE BROAD EMISSION LINE SHIFTS: LOW BINARY FRACTION" @default.
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