Unusual double-peaked emission in the SDSS quasar J093201.60+031858.7

We examine spectral properties of the SDSS quasar J093201.60 + 0318587, in particular the presence of strong blue peaks in the Balmer emission lines offset from the narrow lines by approximately 4200 km s(-1). Asymmetry in the broad central component of the H beta line indicates the presence of a double-peaked emitter However, the strength and sharpness of the blue H beta and blue H gamma peaks make this quasar spectrum unique among double-peaked emitters identified from SDSS spectra We fit a disk model to the H beta line and compare this object with other unusual double-peaked quasar spectra, particularly candidate binary supermassive black holes (SMBHs) Under the binary SMBH scenario, we test the applicability of a model in which a second SMBH may produce the strong blue peak in the Balmer lines of a double-peaked emitter If there were only one SMBH, a circular, Keplerian disk model fit would be insufficient, indicating some sort of asymmetry is required to produce the strength of the blue peak In either case, understanding the nature of the complex line emission in this object will aid in further discrimination between a single SMBH with a complex accretion disk and the actual case of a binary SMBH (C) 2010 Elsevier B V All rights reserved