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ANOMALOUSLY STEEP REDDENING LAW IN QUASARS: AN EXCEPTIONAL EXAMPLE OBSERVED IN IRAS 14026+4341

文献类型：期刊论文

作者Jiang, P1,2,5; Zhou, HY1,2; Ji, T1,2; Shu, XW1,2; Liu, WJ1,2; Wang, JG3,4; Dong, XB1,2; Bai JM(白金明)2,3,4; Wang, HY1,2; Wang, TG1,2
刊名ASTRONOMICAL JOURNAL
出版日期2013-06
卷号145期号:6
ISSN号0004-6256
关键词dust, extinction quasars: individual (IRAS 14026+4341)
通讯作者Jiang, P (reprint author), Chinese Acad Sci, Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China.
产权排序第三完成单位
英文摘要A fraction of the heavily reddened quasars require a reddening curve that is even steeper than that of the Small Magellanic Cloud. In this paper, we thoroughly characterize the anomalously steep reddening law in quasars via an exceptional example observed in IRAS 14026+4341. By comparing the observed spectrum to the quasar composite spectrum, we derive a reddening curve in the rest-frame wavelength range of 1200-10000 angstrom. It has a steep rise at wavelengths shorter than 3000 angstrom, but no significant reddening at longer wavelengths. The absence of dust reddening in the optical continuum is confirmed by the normal broad-line Balmer decrement (the Ha/Ha ratio) in IRAS 14026+4341. The anomalous reddening curve can be satisfactorily reproduced with a dust model containing silicate grains in a power-law size distribution, dn(a)/da.proportional to a(-1.4), truncated at a maximum size of a(max) = 70 nm. The unusual size distribution may be caused by the destruction of large "stardust" grains by quasar activities or a different dust formation mechanism (i.e., the in situ formation of dust grains in quasar outflows). It is also possible that the analogies of the dust grains observed near the Galactic center are responsible for the steep reddening curve. In addition, we find that IRAS 14026+4341 is a weak emission-line quasar (i.e., PHL 1811 analogies) with heavy dust reddening and blueshifted broad absorption lines.
学科主题Astronomy & Astrophysics
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]DIGITAL SKY SURVEY ; ACTIVE GALACTIC NUCLEI ; BROAD ABSORPTION-LINE ; ANGSTROM DUST FEATURE ; INTERSTELLAR EXTINCTION LAW ; SMALL-MAGELLANIC-CLOUD ; 7TH DATA RELEASE ; EMISSION-LINE ; HIGH-REDSHIFT ; STELLAR OBJECTS
收录类别SCI
原文出处http://iopscience.iop.org/article/10.1088/0004-6256/145/6/157/meta
语种英语
WOS记录号WOS:000319167400014
源URL[http://ir.ynao.ac.cn/handle/114a53/5429]  
专题云南天文台_丽江天文观测站（南方基地）
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.Key Laboratory for Research in Galaxies and Cosmology, The University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui, 230026, China
2.Polar Research Institute of China, Jinqiao Road 451, Shanghai 200136, China
3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
5.LAMOST Fellow.
推荐引用方式
GB/T 7714		 Jiang, P,Zhou, HY,Ji, T,et al. ANOMALOUSLY STEEP REDDENING LAW IN QUASARS: AN EXCEPTIONAL EXAMPLE OBSERVED IN IRAS 14026+4341[J]. ASTRONOMICAL JOURNAL,2013,145(6).
APA Jiang, P.,Zhou, HY.,Ji, T.,Shu, XW.,Liu, WJ.,...&Wang, TG.(2013).ANOMALOUSLY STEEP REDDENING LAW IN QUASARS: AN EXCEPTIONAL EXAMPLE OBSERVED IN IRAS 14026+4341.ASTRONOMICAL JOURNAL,145(6).
MLA Jiang, P,et al."ANOMALOUSLY STEEP REDDENING LAW IN QUASARS: AN EXCEPTIONAL EXAMPLE OBSERVED IN IRAS 14026+4341".ASTRONOMICAL JOURNAL 145.6(2013).

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来源：云南天文台

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