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An intensity map of hydrogen 21-cm emission at redshift z approximately 0.8

butterfly09 添加于 2010-8-22 23:25 | 1479 次阅读 | 0 个评论

作者
Chang T-C, Pen U-L, Bandura K, Peterson JB
摘要
Observations of 21-cm radio emission by neutral hydrogen at redshifts z approximately 0.5 to approximately 2.5 are expected to provide a sensitive probe of cosmic dark energy. This is particularly true around the onset of acceleration at z approximately 1, where traditional optical cosmology becomes very difficult because of the infrared opacity of the atmosphere. Hitherto, 21-cm emission has been detected only to z = 0.24. More distant galaxies generally are too faint for individual detections but it is possible to measure the aggregate emission from many unresolved galaxies in the 'cosmic web'. Here we report a three-dimensional 21-cm intensity field at z = 0.53 to 1.12. We then co-add neutral-hydrogen (H i) emission from the volumes surrounding about 10,000 galaxies (from the DEEP2 optical galaxy redshift survey). We detect the aggregate 21-cm glow at a significance of approximately 4sigma.
详细资料
- 文献种类: Journal Article
- 期刊名称: Nature
- 期刊缩写: Nature
- 期卷页: 2010年第466卷第7305期 463-465页
- 地址: [1] IAA, Academia Sinica, PO Box 23-141, Taipei 10617, Taiwan [2] CITA, University of Toronto, 60 St George Street, Toronto, Ontario M5S 3H8, Canada
- ISBN: 0028-0836
学科领域自然科学 » 天文学
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