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Using the OH-airglow suppressor spectrograph at the University of Hawaii 2.2mtelescope and the CGS4 spectrometer at the United Kingdom Infrared Telescope,we have found exceptionally large Balmer decrements in two unusual high-z QSOs,Hawaii 167 (z=2.36, Ha/Hb = 13) and Q0059-2735 (z=1.59, Ha/Hb = 7.6), thelatter being a so-called low-ionization broad absorption line QSO (BALQSO). Weargue that these objects are young QSOs heavily enshrouded by dust. In fact,the internal reddening might be so large as to completely extinguish the QSOlight in the restframe UV, allowing us to see the underlying stellarpopulation. Our possible detection of the 4000 A break in Hawaii 167 supportsthis idea. Its small amplitude indicates a very young age for the population,~15 Myrs. To explain the properties of these QSOs, we propose a model in whicha young QSO is surrounded by a shell of young massive stars mixed withsignificant amounts of dust. We predict that as the QSO emerges from this dustcocoon, it will eventually take on the appearance of a normal BALQSO.Comment: 21 pages (LaTeX, AASTEX4.0) , 1 Postscript table (landscape), 6  Postscript figures, accepted for publication in Astronomical Journal, July  1996 issu

Hawaii 167 and Q0059-2735: Heavily Dust-Enshrouded Young QSOs