We present spectropolarimetric and spectrophotometric observations of the peculiar active galactic nucleus ( AGN ) SDSS J120300.19+162443.7 ( hereafter J1203+1624 ) at z = 0.1656 .
Its optical total flux spectra clearly show broad emission lines ( BELs ) in H \alpha and H \beta .
After removal of narrow emission lines ( NELs ) , the full width at half maximum ( FWHM ) of the Lorentzian BEL is FWHM _ { BEL } \approx 1270 km s ^ { -1 } , fulfilling the conventional definition of a narrow-line Seyfert 1 ( NLS1 ) galaxy .
However , its NELs are unprecedentedly strong when compared to type 1 AGNs .
This , together with its large MIR excess ( g - W _ { 4 } = 13.172 mag ) , implies that the observer and the NEL region might see a different ionization continuum .
Our optical spectropolarimetry confirms its type 2 nature by detecting a polarized blue continuum and Balmer BELs ( FWHM _ { Polarized~ { } BEL } \approx 1 , 183 km s ^ { -1 } ) , with a high polarization degree of > 20 % in the blue wing .
The mass and Eddington rate of the central black hole are estimated based on both transmitted and scattered AGN radiation , which is M _ { \bullet } < 2.9 \times 10 ^ { 7 } M _ { \odot } and L _ { bol } / L _ { Edd } > 1.5 .
Severe extinction of the AGN emission also enables a clear view of the compact host galaxy .
The discovery of J1203+1624 suggests that NLS1 follows the AGN unfication scheme , and studying of its analogs could blaze a new trail for exploring the connection between black hole growth and star formation in the host galaxy .
The interesting features of J1203+1624 , like the peculiar NELs and inflowing scattering clouds within the sublimation radius , are worth detailed follow-ups in the future .