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Discovery of Extremely Broad Balmer Absorption Lines in SDSS J152350.42+391405.2

【标题】Discovery of Extremely Broad Balmer Absorption Lines in SDSS J152350.42+391405.2

【Title】Discovery of Extremely Broad Balmer Absorption Lines in SDSS J152350.42+391405.2

【DOI】10.1088/0004-637X/815/2/113

【作者】 张少华 ; 周宏岩; 史习珩; Xinwen Shu; Wenjuan Liu; 纪拓; 姜鹏; Luming Sun; Junyan Zhou; Xiang Pan

【Author】 Zhang Shaohua ; Zhou Hongyan ; Shi Xiheng ; Xinwen Shu ; Wenjuan Liu ; Ji Tuo ; Jiang Peng ; Luming Sun ; Junyan Zhou ; Xiang Pan

【期刊】The Astrophysical Journal

【Journal】

【期刊年份】2015

【卷】815

【期】2

【关键词】 quasars; absorption lines; quasars; general - quasars; individual;

【Keywords】 quasars; absorption lines; quasars; general - quasars; individual;

【摘要】We present the discovery of Balmer line absorption from Hα to Hγ in an iron low-ionization broad absorption line (FeLoBAL) quasar SDSS J152350.42+391405.2 (hereafter SDSS J1523+3914), by the quasi-simultaneous optical and near-infrared spectroscopy. The Balmer line absorption is at {z}{absor}=0.6039+/- 0.0021 and blueshifted by v = 10,353 km s-1 with respect to the Balmer emission lines. All Balmer BALs have a uniform absorption profile with the widths of {{Δ }}v˜ 12,000 km s-1. We also found the absorption trough in He i* λ10830 with the same velocity and width in the H-band TripleSpec spectrum of SDSS J1523+3914. This object is only the 10th active galactic nucleus known to exhibit nonstellar Balmer absorption, as well as the case with the highest velocity and broadest Balmer absorption lines that have ever been found. A CLOUDY analysis shows that the absorbers require a gas density of {{log}}10 {n}{{e}} ({{cm}}-3)=9 and an ionization parameter of {{log}}10 U=-1.0. They are located at a distance of ˜0.2 pc from the central ionizing source, which is slightly farther than that of broad emission line regions. Furthermore, SDSS J1523+3914 is one of the brightest Balmer BAL quasars ever reported, with unique iron absorption variations, making it the most promising candidate for follow-up high-resolution spectroscopy, multiband observations, and long-term monitoring.

【Abstract】We present the discovery of Balmer line absorption from Hα to Hγ in an iron low-ionization broad absorption line (FeLoBAL) quasar SDSS J152350.42+391405.2 (hereafter SDSS J1523+3914), by the quasi-simultaneous optical and near-infrared spectroscopy. The Balmer line absorption is at {z}{absor}=0.6039+/- 0.0021 and blueshifted by v = 10,353 km s-1 with respect to the Balmer emission lines. All Balmer BALs have a uniform absorption profile with the widths of {{Δ }}v˜ 12,000 km s-1. We also found the absorption trough in He i* λ10830 with the same velocity and width in the H-band TripleSpec spectrum of SDSS J1523+3914. This object is only the 10th active galactic nucleus known to exhibit nonstellar Balmer absorption, as well as the case with the highest velocity and broadest Balmer absorption lines that have ever been found. A CLOUDY analysis shows that the absorbers require a gas density of {{log}}10 {n}{{e}} ({{cm}}-3)=9 and an ionization parameter of {{log}}10 U=-1.0. They are located at a distance of ˜0.2 pc from the central ionizing source, which is slightly farther than that of broad emission line regions. Furthermore, SDSS J1523+3914 is one of the brightest Balmer BAL quasars ever reported, with unique iron absorption variations, making it the most promising candidate for follow-up high-resolution spectroscopy, multiband observations, and long-term monitoring.

【基金/项目】 National Basic Research Program of China (“973” Program, 2013CB834905) ; Chinese Natural Science Foundation (NSFC-11203021, 11573024) ; the SOC Program (CHINARE-2015-02-03)

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