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- W2969277718 abstract "It has been proposed that when the peaks of the broad emission lines in active galactic nuclei (AGNs) are significantly blueshifted or redshifted from the systemic velocity of the host galaxy, this is a consequence of orbital motion of a supermassive blackhole binary (SMB). The AGN J1536+0441 (=SDSS J153636.22+044127.0) has recently been proposed as an example of this phenomenon. It is proposed here instead that 1536+044 is an example of normal line emission from a disc in an AGN. Since SMB formation is expected to be common, and since J1536+0441 is the only sub-parsec SMB candidate suggested to date among ~ 17,500 SDSS AGNs with redshift, z < 0.70, a lack of clear optical spectral evidence for close SMBs is significant. If the line profiles in J1536+0441 are due to disc emission, rather than to two separate emission regions around the members of a SMB, this argues either that the merging of close SMBs is much faster than has generally been hitherto thought, or if the approach is slow, that when the separation of the binary is comparable to the size of the torus and broad-line region, the feeding of the black holes is disrupted." @default.
- W2969277718 created "2019-08-29" @default.
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- W2969277718 date "2009-03-25" @default.
- W2969277718 modified "2023-09-27" @default.
- W2969277718 title "J1536+0441 and the lack of evidence for close supermassive binary black holes" @default.
- W2969277718 hasPublicationYear "2009" @default.
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