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The SDSS-V Black Hole Mapper Reverberation Mapping Project: Coordinated CIV BAL Variability in the Quasar SDSS-RM 357 (SDSS-V Project 0149)

Presentation #108.06 in the session SDSS-IVever: Continuing Science from SDSS-IV Surveys.

Published onJun 19, 2024
The SDSS-V Black Hole Mapper Reverberation Mapping Project: Coordinated CIV BAL Variability in the Quasar SDSS-RM 357 (SDSS-V Project 0149)

Many quasars exhibit broad absorption lines (BALs) that are blue shifted with respect to their corresponding emission lines. These are believed to represent high-velocity (typically 0.1c) outflows from the energetic source. We report on rapid variations of a high-velocity C IV broad absorption line trough in the quasar SDSS RM 357 (J141955.26+522741.1), previously investigated by Hemler et. al. (2019). This object was intensively observed over seven years (2014-2020) as a part of the Sloan Digital Sky Survey Reverberation Mapping Project (Phases III and IV), during which 90 epochs of spectroscopy were obtained with the Baryon Oscillation Spectroscopic Survey spectrograph, and continues to be monitored as a part of the SDSS-V Black Hole Mapper Reverberation Mapping project. We observe significant variability in the equivalent width of the broad (~ 3000 km s−1 wide) C IV trough on rest-frame timescales as short as 1 day (~ 16 hours). We also observe a wing on the blue end of the main C IV trough that appears and disappears and is coordinated with some additional, higher-velocity (but weaker) absorption features (“sub-troughs”). The wing and sub-troughs are well-correlated with the overall main trough variability. The behavior of the ensemble seems anti-correlated with the continuum flux level, suggesting that the rapid changes in these features are in response to changes in the incident ionizing continuum. We will present our analysis to date and discuss emerging results of a deeper investigation into the variability of these troughs.

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