Tremmel, Michael; Governato, Fabio; Volonteri, Marta; Pontzen, Andrew; Quinn, Thomas R; (2021) Erratum: "Wandering Supermassive Black Holes in Milky-Way-mass Halos" (2018, ApJL, 857, L22). [Corrigendum]. The Astrophysical Journal Letters , 909 (2) , Article L30. 10.3847/2041-8213/abeaaa.

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Abstract

A bug in the analysis script used to create Figure 3 in the published article resulted in incorrect angles relative to the plane of the disk being attributed to the wandering supermassive black holes. The old results were produced with the numpy arctan function when the arctan2 function should have been used. With this error corrected, the predicted distribution of SMBH positions relative to the plane of the galactic disk for MW-like galaxies is consistent with a random distribution. We no longer find any preference for wandering SMBHs to exist outside the plane of the galaxy. In fact, there is a slight preference for the BHs to exist closer to the plane, with 66% ± 12% of the BHs existing within 30° of the disk plane compared to 50% for a random distribution. However, this preference is of low significance (less than 2σ). A possible explanation of this slight preference could be that interactions taking place edge-on to the plane of the disk may experience stronger tidal forces that result in more efficient disruption of the secondary galaxy. This is the only aspect of the paper where the results are altered by this error. No other results are affected.

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