We present properties of two types of bulges ( classical and pseudo- bulges ) in 20 luminous infrared galaxies ( LIRGs ) observed in the near infrared of the H , K _ { s } and 1.91 \mu m narrow-band targeting at the hydrogen Pa \alpha emission line by the University of Tokyo Atacama Observatory ( TAO ) 1.0 m telescope .
To classify the two types of bulges , we first perform a two-dimensional bulge-disk decomposition analysis in the K _ { \mathrm { s } } -band images .
The result shows a tentative bimodal distribution of Sérsic indices with a separation at \log ( n _ { b } ) \sim 0.5 , which is consistent with that of classical and normal galaxies .
We next measure extents of the distribution of star forming regions in Pa \alpha emission line images , normalized with the size of the bulges , and find that they decrease with increasing Sérsic indices .
These results suggest that star-forming galaxies with classical bulges have compact star forming regions concentrated within the bulges , while those with pseudobulges have extended star forming regions beyond the bulges , suggesting that there are different formation scenarios at work in classical and pseudobulges .