SDSS J142225.03+535901.7宽吸收线多历元光谱光变分析

Multi-epochs Spectral Variability Analysis of Broad Absorption Lines in QSO SDSS J142225.03+535901.7

类星体中的宽吸收线(broad absorption line,BAL)是外流存在的最强观测证据之一.BAL普遍存在光变现象,分析BAL光变有助于限制外流的物理模型,来自类星体中心引擎的沿视线方向入射的电离连续谱的变化是导致大多数BAL光变的主要机制.如果一个类星体的BAL吸收坑在不同速度处同时存在一个方向的变化(变弱或变强),那么它的BAL光变很可能主要由电离连续谱的变化导致.类星体SDSS J142225.03+535901.7具有55个历元高信噪比光谱观测,其BAL存在光变现象.该源BAL的不同速度组分的等值宽度与连续谱光度之间均存在显著的负相关性(Spearman相关性检验,不相关概率p值小于0.05).而各组分的等值宽度与连续谱谱指数之间无显著负相关性可以排除等值宽度与连续谱光度之间的负相关性是由视线上含尘埃气体在垂直于视线方向上运动引起的这一可能因此,该源的BAL光变主要由电离连续谱的变化导致.

Broad absorption lines(BALs)in quasars are among the most compelling observational evidence for the presence of outflows.BALs commonly exhibit spectral variability,and analyzing such variations helps to constrain the physical models of these outflows.Variations in the ionizing continuum incident along the line of sight from the central engine of quasars are thought to be the primary mechanism driving most BAL variability.If the BAL absorption troughs in a quasar simultaneously vary(either weakening or strengthening)at different velocities in the same direction,it is highly likely that BAL variability is primarily induced by variations in the ionizing continuum.The quasar SDSS J142225.03+535901.7,with 55 epochs of high signal-to-noise spectra,displays BAL variability.There is a significant(Spearman's correlation test,with a non-correlation probability p-value less than 0.05)anticorrelation between the equivalent widths of various velocity components of the BAL and the continuum luminosity.There is no significant anticorrelation between the equivalent widths of these components and the spectral index of the continuum,ruling out that the potential negative correlation between equivalent width and continuum luminosity is caused by the vertical motion of dusty gas along the line of sight.Therefore,it can be inferred that the BAL variability in this source is primarily driven by changes in the ionizing continuum.