# Correlation between the ionizing continuum and variable C iv broad absorption line in multi-epoch observations of SDSS J141007.74+541203.3

## TL;DR

This study analyzes multi-epoch observations of quasar SDSS J141007.74+541203.3, confirming that variations in its C iv broad absorption line are anti-correlated with changes in the ionizing continuum, supporting the rapid response hypothesis.

## Contribution

It provides the first statistical confirmation of the anti-correlation between BAL variability and ionizing continuum changes in a specific quasar.

## Key findings

- Confirmed anti-correlation between BAL equivalent width and continuum flux.
- Supports rapid response model for BAL variability.
- Provides independent evidence aligning with previous studies.

## Abstract

Correlation between the variations of quasar absorption lines and the ionizing continuum have been recently confirmed in systematic studies. However, no convincing individual case is reported. We present a statistical analysis of the variable C iv broad absorption line (BAL) in the quasar SDSS J141007.74+541203.3, which have been observed with 44 epochs by the Sloan Digital Sky Survey Data Release 14. Grier et al. (2015) has recently concluded that the most likely cause of the variability of the BAL in SDSS J141007.74+541203.3 is a rapid response to changes in the incident ionizing continuum. In this paper, we confirm the anticorrelation between the equivalent width of BALs and the flux of the continuum based on the spectra of this quasar that show significant variations, which serve as another independent evidence for the view of Grier et al. (2015).