The Quasar-associated 2175 \AA\ Dust Absorbers in the SDSS DR16 Quasar Catalog
Shaohua Zhang, Yuchong Luo, Shangchun Xie, Chao Gao, Zhijian Luo, Chenggang Shu, Hubing Xiao

TL;DR
This study systematically analyzes 2175 Å dust absorbers associated with quasars in SDSS DR16, revealing their properties, environmental variations, and potential evolution over cosmic time.
Contribution
First comprehensive analysis of quasar-associated 2175 Å dust absorbers using SDSS DR16 data, characterizing their properties and environmental differences.
Findings
Absorbers have weak bump strengths and narrow widths.
Average extinction curves resemble LMC but are shallower.
Bump peak positions vary and shift in BAL quasars.
Abstract
We present, for the first time, a systematic study of quasar-associated 2175 \AA\ dust absorbers using spectroscopic data from the Sloan Digital Sky Survey (SDSS) Data Release 16 (DR16). By analyzing the optical spectra and multi-band magnitudes of 557,674 quasars in the redshift range of , we identify 843 absorbers that share the same redshifts as quasars and are believed to originate from dust in the quasar nuclei, the host galaxies, or their surrounding environments. These absorbers exhibit weak bump strengths () and narrow widths (), while their peak positions span a broad range from to . Their average extinction curves resemble those of the Large Magellanic Cloud (LMC) but exhibit a shallower slope. In broad absorption line (BAL) quasars, the absorption bumps show…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena · Astrophysical Phenomena and Observations
