类星体SDSS J0916+2921的类银河系2175?尘埃消光特征
Chinese Astronomy and Astrophysics(2020)
Abstract
光谱观测显示类星体SDSS J091613.60+292106.1(简称J0916+2921,系统红移zem=1.1418±0.0018)中有特殊的2175?A尘埃消光特征,其强度显著大于银河系平均强度.光谱同时探测到与尘埃成协的丰富气体吸收线,确定吸收线系统红移为zabs=1.1413±0.0002,和类星体红移一致.气态金属离子柱密度相对太阳丰度的比例为[Al/Zn]=?1.68±0.10,[Cr/Zn]=?0.49±0.10,[Fe/Zn]=?0.81±0.18.尘埃耗散作用显著,说明该系统中尘埃十分丰富,与观测的强尘埃消光特征吻合.类银河系的2175?A尘埃消光特征在类星体光谱中多见于中间插入吸收线系统,至今未明确认证内禀吸收线系统出现该特征,类星体SDSS J0916+2921是目前仅有的数个候选者之一.该类星体X射线辐射相较一般类星体更强,后续可用作研究2175?A尘埃在强高能射线照射条件下的形成与离解平衡,以揭示2175?A尘埃的化学成分、物理性质和起源.
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Key words
Galaxies: active galactic nucleus (AGN),ISM: extinction,quasars: absorption lines
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