AN APPARENT REDSHIFT DEPENDENCE OF QUASAR CONTINUUM: IMPLICATION FOR COSMIC DUST EXTINCTION?
文献类型：期刊论文
| 作者 | Xie, Xiaoyi1,2; Shen, Shiyin1,3 ; Shao, Zhengyi1,3; Yin, Jun1
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2015-04-01 |
| 卷号 | 802期号:2页码:1 |
| 关键词 | dust quasars: general extinction |
| 英文摘要 | We investigate the luminosity and redshift dependence of the quasar continuum by means of the. composite spectrum using a large non-BAL radio-quiet quasar sample drawn from the Sloan Digital Sky Survey. Quasar continuum slopes in the UV-Opt band are measured at two different wavelength ranges, i.e., alpha(nu 12) (1000 similar to 2000 angstrom) and alpha(nu 24) (2000 similar to 4000 angstrom) derived from a. power-law fitting. Generally, the UV spectra slope becomes harder (higher a.) toward higher bolometric luminosity. On the other hand, when quasars are further grouped into luminosity bins, we find that both alpha(nu 12) and alpha(nu 24) show significant anti-correlations with redshift (i.e., the quasar continuum becomes redder toward higher redshift). We suggest that the cosmic dust extinction is very likely the cause of this observed alpha(nu) - z relation. We build a simple cosmic dust extinction model to quantify the observed reddening tendency and find an effective dust density n sigma(nu) similar to 10(-5)h Mpc(-1) at z < 1.5. The other possibilities that could produce such a reddening effect have also been discussed. |
| 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 ; ULTRAVIOLET CONTINUUM ; INTERGALACTIC DUST ; IA SUPERNOVAE ; UV CONTINUUM ; DATA RELEASE ; RADIO-LOUD ; SPECTRA ; LUMINOSITY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000352138300003 |
| 公开日期 | 2015-08-18 |
| 源URL | [http://119.78.226.72/handle/331011/18229]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Key Lab Astrophys, Shanghai 200234, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xie, Xiaoyi,Shen, Shiyin,Shao, Zhengyi,et al. AN APPARENT REDSHIFT DEPENDENCE OF QUASAR CONTINUUM: IMPLICATION FOR COSMIC DUST EXTINCTION?[J]. ASTROPHYSICAL JOURNAL LETTERS,2015,802(2):1. |
| APA | Xie, Xiaoyi,Shen, Shiyin,Shao, Zhengyi,&Yin, Jun.(2015).AN APPARENT REDSHIFT DEPENDENCE OF QUASAR CONTINUUM: IMPLICATION FOR COSMIC DUST EXTINCTION?.ASTROPHYSICAL JOURNAL LETTERS,802(2),1. |
| MLA | Xie, Xiaoyi,et al."AN APPARENT REDSHIFT DEPENDENCE OF QUASAR CONTINUUM: IMPLICATION FOR COSMIC DUST EXTINCTION?".ASTROPHYSICAL JOURNAL LETTERS 802.2(2015):1. |
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来源：上海天文台
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