IONIZATION NEAR ZONES ASSOCIATED WITH QUASARS AT z similar to 6
文献类型：期刊论文
| 作者 | Carilli, C. L.1; Wang, Ran1,2; Fan, X.3; Walter, F.4; Kurk, J.4; Riechers, D.5; Wagg, J.6; Hennawi, J.4; Jiang, L.3; Menten, K. M.7 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2010-05-01 |
| 卷号 | 714期号:1页码:834-839 |
| 关键词 | galaxies: formation galaxies: high-redshift large-scale structure of universe quasars: absorption lines |
| ISSN号 | 0004-637X |
| 英文摘要 | We analyze the size evolution of HII regions around 27 quasars between z = 5.7 and 6.4 ("quasar near zones" or NZs). We include more sources than previous studies, and we use more accurate redshifts for the host galaxies, with eight CO molecular line redshifts and nine Mg II redshifts. We confirm the trend for an increase in NZ size with decreasing redshift, with the luminosity- normalized proper size evolving as R(NZ, corrected) = (7.4 +/- 0.3) - (8.0 +/- 1.1) x (z - 6) Mpc. While derivation of the absolute neutral fraction remains difficult with this technique, the evolution of the NZ sizes suggests a decrease in the neutral fraction of intergalactic hydrogen by a factor similar to 9.4 from z = 6.4 to 5.7, in its simplest interpretation. Alternatively, recent numerical simulations suggest that this rapid increase in NZ size from z = 6.4 to 5.7 is due to the rapid increase in the background photo-ionization rate at the end of the percolation or overlap phase, when the average mean-free path of ionizing photons increases dramatically. In either case, the results are consistent with the idea that z similar to 6-7 corresponds to the tail end of cosmic reionization. The scatter in the normalized NZ sizes is larger than expected simply from measurement errors, and likely reflects intrinsic differences in the quasars or their environments. We find that the NZ sizes increase with quasar UV luminosity, as expected for photo-ionization dominated by quasar radiation. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; BLACK-HOLE MASSES ; Z-SIMILAR-TO-6 QUASARS ; HOST GALAXY ; NEUTRAL HYDROGEN ; DISTANT QUASARS ; MOLECULAR GAS ; Z-GREATER-THAN-5.7 QUASARS ; INTERGALACTIC MEDIUM ; COSMIC REIONIZATION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000276701000067 |
| 公开日期 | 2011-11-23 |
| 源URL | [http://159.226.72.40/handle/332002/1201]  |
| 专题 | 紫金山天文台_南极天文中心 |
| 作者单位 | 1.Natl Radio Astron Observ, Socorro, NM 87801 USA 2.CAS 2, Purple Mt Observ, Nanjing 210008, Peoples R China 3.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA 4.Max Planck Inst Astron, D-69117 Heidelberg, Germany 5.CALTECH, Dept Astron, Pasadena, CA 91125 USA 6.ESO ALMA, Santiago 19, Chile 7.Max Planck Inst Radioastron, D-5300 Bonn, Germany 8.Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany 9.Princeton Univ Observ, Princeton, NJ 08544 USA 10.Inst Radio Astron Millimetr, F-38406 St Martin Dheres, France |
| 推荐引用方式 GB/T 7714 | Carilli, C. L.,Wang, Ran,Fan, X.,et al. IONIZATION NEAR ZONES ASSOCIATED WITH QUASARS AT z similar to 6[J]. ASTROPHYSICAL JOURNAL,2010,714(1):834-839. |
| APA | Carilli, C. L..,Wang, Ran.,Fan, X..,Walter, F..,Kurk, J..,...&Cox, P..(2010).IONIZATION NEAR ZONES ASSOCIATED WITH QUASARS AT z similar to 6.ASTROPHYSICAL JOURNAL,714(1),834-839. |
| MLA | Carilli, C. L.,et al."IONIZATION NEAR ZONES ASSOCIATED WITH QUASARS AT z similar to 6".ASTROPHYSICAL JOURNAL 714.1(2010):834-839. |
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来源：紫金山天文台
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