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We report new spectroscopic observations performed in 2010 and 2011 forluminous radio-quite quasar PG 1416-129. Our new spectra with high qualitycover both H$\beta$ and H$\alpha$ regions, and show negligible line profilevariation within a timescale of one year. The two spectra allow us to study thevariability of the Balmer line profile by comparing the spectra with theprevious ones taken at 10 and 20 years ago. By decomposing the broad Balmeremission lines into two Gaussian profiles, our spectral analysis suggests astrong response to the continuum level for the very broad component, andsignificant variations in both bulk blueshift velocity/FWHM and flux for thebroad component. The new observations additionally indicate flat Balmerdecrements (i.e., too strong H$\beta$ emission) at the line wings, which ishard to be reproduced by recent optically thin models. With these observationswe argue that a separate inner optically thin emission-line region might not benecessary in the object to reproduce the observed line profiles.

Strong Response of the very broad h$\beta$ Emission Line in Luminous Radio-Quite Quasar pg1416-129