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ヨネハラ アツノリ
YONEHARA ATSUNORI
米原 厚憲 所属 京都産業大学 理学部 宇宙物理・気象学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2007/09 |
| 形態種別 | その他 |
| 標題 | Large-scale structure of short-lived Lyman alpha emitters |
| 執筆形態 | その他 |
| 掲載誌名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
| 出版社・発行元 | BLACKWELL PUBLISHING |
| 巻・号・頁 | 380(1),pp.L49-L53 |
| 著者・共著者 | Ikkoh Shimizu,Masayuki Umemura,Atsunori Yonehara |
| 概要 | Recently discovered large- scale structure of Lyman a emitters ( LAEs) raises a novel challenge to the cold dark matter ( CDM) cosmology. The structure is extended over more than 50 Mpc at redshift z = 3.1, and exhibits a considerably weak angular correlation. Such properties of LAE distributions appear to be incompatible with the standard biased galaxy formation scenario in the CDM cosmology. In this Letter, by considering the possibility that LAEs are short- lived events, we attempt to build up the picture of LAEs concordant with the CDM cosmology. We find that if the lifetime of LAEs is as short as ( 6.7 +/- 0.6) x 10(7) yr, the distributions of simulated galaxies successfully match the extension and morphology of large- scale structure of LAEs at z = 3.1, and also the weak angular correlation function. This result implies that LAEs at z = 3.1 do not necessarily reside in high density peaks, but tends to be located in less dense regions, in a different way from the expectation by the standard biased galaxy formation scenario. In addition, we make a prediction for the angular correlation function of LAEs at redshifts higher than 3. It is found that the prediction deviates from that made by the standard biased galaxy formation scenario even at redshifts 4 less than or similar to z less than or similar to 6. |
| DOI | 10.1111/j.1745-3933.2007.00346.x |
| ISSN | 0035-8711 |