Co-variability Between the Broad Absorption Lines and Narrow Absorption Lines

Abstract We investigate the relationship between the variability of broad absorption lines (BALs) or narrow absorption lines (NALs) and that of continuum using a data set of two-epoch SDSS spectra containing 134 C iv NAL-BAL pairs. Our analysis reveals an anti-correlation between the fractional equivalent width (EW) variations in NALs (or BALs) and the fractional flux variations of the continuum, with Spearman rank correlation coefficients of r = −0.47 ( p = 1E-08) and r = −0.58 ( p = 1E-13), respectively. In addition, we find a positive correlation between the fractional EW variations in NALs and BALs ( r = 0.72, p = 1E-22), and derive a regression equation ΔEW NAL /〈EW NAL 〉 = 0.803ΔEW BAL /〈EW BAL 〉 + 0.008, with an intrinsic scatter of 0.14. These results suggest that the variability in the ionizing continuum may play a significant role in the observed changes in C iv NALs and BALs, supporting the idea of photoionization-driven variability. The co-variability between C iv NALs and BALs may imply that they originate from outflows with similar physical conditions.

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Publication Details

Journal
Research in Astronomy and Astrophysics
Published
2024-08-13
DOI
https://doi.org/10.1088/1674-4527/ad6ee2
Citations
1
Primary Topic
Atmospheric and Environmental Gas Dynamics
Type
article
Field-Weighted Citation Impact
0.28

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article

Co-variability Between the Broad Absorption Lines and Narrow Absorption Lines

Wei-Jian Lu, Bo-Lin 柏霖 Qin 覃, Jing 静 Li 黎
1 citations
Research in Astronomy and Astrophysics
Atmospheric and Environmental Gas Dynamics
0.28
article

Co-variability Between the Broad Absorption Lines and Narrow Absorption Lines

Wei-Jian Lu, Bo-Lin 柏霖 Qin 覃, Jing 静 Li 黎
article en
1 citations

Abstract

Abstract We investigate the relationship between the variability of broad absorption lines (BALs) or narrow absorption lines (NALs) and that of continuum using a data set of two-epoch SDSS spectra containing 134 C iv NAL-BAL pairs. Our analysis reveals an anti-correlation between the fractional equivalent width (EW) variations in NALs (or BALs) and the fractional flux variations of the continuum, with Spearman rank correlation coefficients of r = −0.47 ( p = 1E-08) and r = −0.58 ( p = 1E-13), respectively. In addition, we find a positive correlation between the fractional EW variations in NALs and BALs ( r = 0.72, p = 1E-22), and derive a regression equation ΔEW NAL /〈EW NAL 〉 = 0.803ΔEW BAL /〈EW BAL 〉 + 0.008, with an intrinsic scatter of 0.14. These results suggest that the variability in the ionizing continuum may play a significant role in the observed changes in C iv NALs and BALs, supporting the idea of photoionization-driven variability. The co-variability between C iv NALs and BALs may imply that they originate from outflows with similar physical conditions.

Research in Astronomy and AstrophysicsVol. 24(9)
Foshan University (CN), Guangxi University (CN), Baise University (CN)
Smithsonian Institution, U.S. Department of Energy, Alfred P. Sloan Foundation, Yale University, Carnegie Institution of Washington, Vanderbilt University, Ohio State University, University of Utah, University of Washington, Johns Hopkins University, Carnegie Mellon University, University of Notre Dame, University of Portsmouth, New Mexico State University, York University, University of Oxford, National Natural Science Foundation of China, Ministério da Ciência, Tecnologia e Inovação, Natural Science Foundation of Guangxi Province, Universidad Nacional Autónoma de México, Baise University, Max-Planck-Institut für Astrophysik, Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Canarias, Office of Science, University of Colorado Boulder, Smithsonian Astrophysical Observatory, Leibniz-Gemeinschaft, Lawrence Berkeley National Laboratory
Openalex Percentile: Top 43%
Atmospheric and Environmental Gas Dynamics
0.28
DOIOpen Access PDFOpenAlex
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