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ANOMALOUSLY STEEP REDDENING LAW IN QUASARS: AN EXCEPTIONAL EXAMPLE OBSERVED IN IRAS 14026+4341
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; Jiang, P (reprint author), Chinese Acad Sci, Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2013-06
卷号145期号:6
DOI10.1088/0004-6256/145/6/157
产权排序第3完成单位
收录类别SCI
关键词Quasars: Individual (Iras 14026+4341) Dust Extinction
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.
项目资助者Natural Science Foundation of China [NSFC 11233002, NSFC 11203022, NSFC 11033007] ; SOC program [CHINARE2012-02-03] ; Fundamental Research Funds for the Central Universities ; China Postdoctoral Science Foundation ; Telescope Access Program (TAP) ; National Astronomical Observatories ; Chinese Academy of Sciences ; Special Fund for Astronomy from the Ministry of Finance. Observations ; Association of Universities for Research in Astronomy, Inc. ; NASA [NAS5-26555] ; National Aeronautics and Space Administration ; National Science Foundation ; Alfred P. Sloan Foundation ; Participating Institutions ; U.S. Department of Energy ; Japanese Monbukagakusho ; Max Planck Society ; Higher Education Funding Council for England
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
WOS记录号WOS:000319167400014
WOS研究方向Astronomy & Astrophysics
WOS类目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
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5429
专题丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
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.
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.
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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.,...&Jiang, P .(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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