A Lyman-α blob in the GOODS South field: evidence for cold accretion onto a dark matter halo ⋆
A Lyman-α blob in the GOODS South field: evidence for cold accretion onto a dark matter halo ⋆
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DOI：
10.1051/0004-6361:200600025
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发表时间：
2005-12
影响因子：
6.5
通讯作者：
K. Nilsson;J. Fynbo;P. Møller;J. Sommer-Larsen;C. Ledoux;ESO-Garching;Dark Cosmology Centre;Dk;ESO-Chile
中科院分区：
文献类型：
--
作者：
K. Nilsson;J. Fynbo;P. Møller;J. Sommer-Larsen;C. Ledoux;ESO-Garching;Dark Cosmology Centre;Dk;ESO-Chile
接收日期/接受日期摘要。我们报道了在大天文台深部勘测(货物)南区发现了z=3.16Lyman-�发射斑点。这一发现是由VLT通过窄带成像完成的。该斑点的总Ly�光度为�10 43 erg S−1，直径大于60kpc。货物领域可用的多波长数据包括从X射线(Chandra)到红外(Spitzer)的13个波段。与其他已知的Lyblb不同，这个斑点在任何宽带中都没有明显的连续谱对应物。特别是，在HST/ACS深成像中没有发现光学对应物。对于之前发表的水滴，AGN(活动星系核)或“超风”模型被发现提供了与数据最匹配的数据。我们在这里认为，来自这一团团的延展的Lyefit最有可能的来源是暗物质晕上的冷吸积。
Received date / Accepted date Abstract. We report on the discovery of a z = 3.16 Lyman-� emitting blob in the Great Observatories Origins Deep Survey (GOODS) South field. The discovery was made with the VLT, through narrow-band imaging. The blob has a total Ly� luminosity of � 10 43 erg s −1 and a diameter larger than 60 kpc. The available multi-wavelength data in the GOODS field consists of 13 bands from X-rays (Chandra) to infrared (Spitzer). Unlike other known Lyblobs, this blob shows no obvious continuum counter-parts in any of the broad-bands. In particular, no optical counter-parts are found in deep HST/ACS imaging. For previously published blobs, AGN (Active Galactic Nuclei) or "superwind" models have been found to provide the best match to the data. We here argue that the most probable origin of the extended Lyemission from this blob is cold accretion onto a dark matter halo.