Transiting as a Potential Cause for Variations in Low-Ionization Broad Absorption Line Regions (loBALs)

It is important to consider the possibility of transiting as a potential cause for the variations observed in some of these low-ionization broad absorption line regions (loBALs). The presence of a P V broad absorption line (BAL), which indicates high saturation of the C IV BAL, provides strong support for the transiting scenario. This is further supported by the C IV/P V optical depth ratio being greater than approximately 100, as demonstrated by previous studies (Hamann, 1998; Leighly et al., 2009; Leighly, Dietrich & Barber, 2011; Borguet et al., 2012).