We present the first optical photometric study of the active galaxy SBS 0748+499 .
First , we present B , V , R and I photometric data : total magnitudes and B - V , B - R , B - I colors ; surface brightness , color and geometric profiles , with emphasis on the morphology and its relation to the global photometric properties of this galaxy .
Then , from our surface photometry study we derive the bulge–to–disk luminosity ratio B / D in the four bands .
We find that the host galaxy shows a bar ( a \sim 8 kpc ) and a low–brightness spiral structure .
The morphological classification for the host galaxy of this AGN is SBab .
Additionally , we present new optical spectrophotometric observations that clearly show that the object can be classified as Sy 1.9 galaxy .
Finally , we estimate the black hole mass ( M _ { BH } ) associated with the nucleus of SBS 0748+499 using the absolute R –band bulge magnitude– M _ { BH } relation , and the FWHM [ OIII ] _ { 5007 } – \sigma _ { \star } relation .
We find that M _ { BH } = 2.6 \times 10 ^ { 7 } M _ { \odot } and M _ { BH } = 8.8 \times 10 ^ { 7 } M _ { \odot } , respectively .