The mineralogy of newly formed dust in active galactic nuclei

doi:10.1016/j.pss.2017.08.012

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	The mineralogy of newly formed dust in active galactic nuclei
	Srinivasan, Sundar 5; Kemper, F.5; Zhou, Yeyan 6; Hao, Lei 6; Gallagher, Sarah C.1,2; Shangguan, Jinyi 3,4; Ho, Luis C.3,4; Xie, Yanxia 3; Scicluna, Peter 5; Foucaud, Sebastien 5,7,8
刊名	PLANETARY AND SPACE SCIENCE
	2017-12-01
卷号	149 页码:56-63
关键词	Active Galactic Nuclei Dust Silicates
ISSN号	0032-0633
DOI	10.1016/j.pss.2017.08.012
英文摘要	The tori around active galactic nuclei (AGN) are potential formation sites for large amounts of dust, and they may help resolve the so-called dust budget crisis at high redshift. We investigate the dust composition in 53 of the 87 Palomar Green (PG) quasars showing the 9.7 mu m silicate feature in emission. By simultaneously fitting the mid infrared spectroscopic features and the underlying continuum, we estimate the mass fraction in various amorphous and crystalline dust species. We find that the dust consists predominantly of alumina and amorphous silicates, with a small fraction in crystalline form. The mean crystallinity is 8 +/- 6%, with more than half of the crystallinities greater than 5%, well above the upper limit determined for the Galaxy. Higher values of crystallinity are found for higher oxide fractions and for more luminous sources.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000423008100008
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32475]
专题	中国科学院上海天文台
通讯作者	Srinivasan, Sundar
作者单位	1.Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada 2.Ctr Planetary & Space Explorat, London, ON N6A 3K7, Canada 3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 4.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China 5.Acad Sinica, Inst Astron & Astrophys, 11F Astron Math Bldg,1 Roosevelt Rd,Sec 4, Taipei 10617, Taiwan 6.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 7.Natl Taiwan Normal Univ, Dept Earth Sci, Taipei 11677, Taiwan 8.Shanghai Jiao Tong Univ, Ctr Astron & Astrophys, Shanghai 200340, Peoples R China
推荐引用方式 GB/T 7714	Srinivasan, Sundar,Kemper, F.,Zhou, Yeyan,et al. The mineralogy of newly formed dust in active galactic nuclei[J]. PLANETARY AND SPACE SCIENCE,2017,149:56-63.
APA	Srinivasan, Sundar.,Kemper, F..,Zhou, Yeyan.,Hao, Lei.,Gallagher, Sarah C..,...&Peng, Rita H. T..(2017).The mineralogy of newly formed dust in active galactic nuclei.PLANETARY AND SPACE SCIENCE,149,56-63.
MLA	Srinivasan, Sundar,et al."The mineralogy of newly formed dust in active galactic nuclei".PLANETARY AND SPACE SCIENCE 149(2017):56-63.