We report the discovery of highly reddening and hydrogen Balmer and metastable helium broad absorption lines in the quasar SDSS J145057.28+530007.6 , based on the optical and near-infrared spectra taken from the SDSS-III/BOSS and the TripleSpec observations .
The nuclear continuum , Balmer decrement and absorption-line depth analyses suggest that ( 1 ) the accretion disk is completely obscured and the covering factor of the broad-line region ( BLR ) is only 0.39 \pm 0.03 , ( 2 ) the power-law continuum is reddened by the SMC extinction law of E ( B - V ) = 0.72 \pm 0.01 mag and the dusty materials are mainly associated with Ca ii H and K rather than the Balmer and He i* absorption-line system , ( 3 ) the unsaturated Balmer ( H \beta , H \gamma , and H \delta ) and He i* \lambda 3889 absorption lines have same two-Gaussian profiles with the shifts of -931 \pm 33 and -499 \pm 39 km s ^ { -1 } and the widths of 121 \pm 28 and 196 \pm 37 km s ^ { -1 } , respectively .
Constrained mutually by the Balmer , He i* absorption lines and undetected Fe ii* \lambda 5169 in the photoionization simulations , the physical properties of the outflow gases are derived as follows : ionization parameter 10 ^ { -1.4 } \lesssim U \lesssim 10 ^ { -0.8 } , density 10 ^ { 8.2 \pm 0.4 } \lesssim n _ { H } \lesssim 10 ^ { 9.0 \pm 0.4 } cm ^ { -3 } , and column density 10 ^ { 22.0 \pm 0.2 } \lesssim N _ { H } \lesssim 10 ^ { 22.2 - 22.3 } cm ^ { -2 } .
We propose that the ultra-dense outflow gases appear in the vicinity of the surface of the BLR or are located at most 3.12 pc away from the engine .
That probably implies that the outflow originates from the BLR , and this kind of ultra-dense BLR scale outflow gases can effectively test the physical properties of the outer gases of the BLR .