This study investigates the relationship between the detection rates of MgⅡabsorption lines and the asymmetries of[OⅢ]emission lines.We first select 21,364 quasars from the Sloan Digital Sky Survey DR12Q exhibiting ...This study investigates the relationship between the detection rates of MgⅡabsorption lines and the asymmetries of[OⅢ]emission lines.We first select 21,364 quasars from the Sloan Digital Sky Survey DR12Q exhibiting prominent[OⅢ]emission lines,of which 351 quasars have Category 1 MgⅡabsorption lines(4365≤υ_(r)≤10,000 km s^(-)1)and 518 quasars have Category 2 MgⅡabsorption lines(610≤υ_(r)≤4365 km s-1).Subsequently,we quantify the asymmetries of[OⅢ]emission lines using the velocity offsetδv,and find that the detection rates of Category 1 MgⅡabsorption lines(predominantly intervening absorbers)show no correlation with the blueshifted asymmetries of[OⅢ]emission lines,whereas the detection rates of Category 2 MgⅡabsorption lines(primarily outflow and intervening absorbers)increase with risingδ_(v).Finally,we discuss the results from two perspectives:quasar evolutionary stages and acceleration mechanisms driven by radiation pressure.展开更多
基金supported by the Scientific Research Project of Guangxi Minzu University(2023KJQD07)Guangxi Natural Science Foundation(2025GXNSFBA069287)+2 种基金the Guangxi Natural Science Foundation(2024GXNSFDA010069,2019GXNSFFA245008)the National Natural Science Foundation of China(12073007)the Scientific Research Project of Guangxi University for Nationalities(2018KJQD01)。
文摘This study investigates the relationship between the detection rates of MgⅡabsorption lines and the asymmetries of[OⅢ]emission lines.We first select 21,364 quasars from the Sloan Digital Sky Survey DR12Q exhibiting prominent[OⅢ]emission lines,of which 351 quasars have Category 1 MgⅡabsorption lines(4365≤υ_(r)≤10,000 km s^(-)1)and 518 quasars have Category 2 MgⅡabsorption lines(610≤υ_(r)≤4365 km s-1).Subsequently,we quantify the asymmetries of[OⅢ]emission lines using the velocity offsetδv,and find that the detection rates of Category 1 MgⅡabsorption lines(predominantly intervening absorbers)show no correlation with the blueshifted asymmetries of[OⅢ]emission lines,whereas the detection rates of Category 2 MgⅡabsorption lines(primarily outflow and intervening absorbers)increase with risingδ_(v).Finally,we discuss the results from two perspectives:quasar evolutionary stages and acceleration mechanisms driven by radiation pressure.
