; Chen, Yan-Mei
; Gu, Qiu-Sheng] Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
; [Peng, Zhi-Xin
; Chen, Yan-Mei
; Gu, Qiu-Sheng] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Peoples R China
; [Hu, Chen] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
We analyze the optical spectrum of type 1 QSO SDSS J1425+3231. This object is interesting since its narrow emission lines, such as [O III]lambda lambda 4959, 5007, are double-peaked, and the line structure can be modeled well by three Gaussian components: two components for the two peaks (we refer to the peaks at low/high redshift as "the blue/red component") and another one for the line wing which has the same line center as that of the blue component, but is similar to 3 times broader. The separation between the blue and red components is similar to 500 km s(-1) with the blue component being similar to 2 times broader than the red one. The H beta emission can be separated into four components: two for the double-peaked narrow line and two for the broad line which comes from the broad line regions. The black hole mass estimated from the broad H beta emission line using the typical reverberation mapping relation is 0.85 x 10(8) M-circle dot, which is consistent with that derived from parameters of [O III]lambda 5007 of the blue component. We suggest that this QSO might be a dual AGN system; the broad H beta emission line is mainly contributed by the primary black hole (traced by the blue component) while the broad H beta component of the secondary black hole (traced by the red component) :is hard to be separated out considering a resolution of similar to 2000 for SDSS spectra or it may be totally obscured by the dusty torus.