The Demise of the Classical Broad-Line Region in the Luminous Quasar PG 1416−129
The Demise of the Classical Broad-Line Region in the Luminous Quasar PG 1416−129
New observations of the broad-line quasar PG 1416-129 reveal a large decline in its continuum luminosity over the past 10 years. In response to the continuum change, the "classical" broad component of Hβ has almost completely disappeared (a factor of 10 decrease in flux). In its place there remains a …