What powers Lyα blobs?
What powers Lyα blobs?
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Lyα 斑点的力量是什么？
DOI：
10.1051/0004-6361/201424165
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发表时间：
2015
影响因子：
6.5
通讯作者：
Zheng Z.
中科院分区：
文献类型：
--
作者：
Ao Y.;Matsuda Y.;Beelen A.;Henkel C.;Cen R.;De Breuck C.;Francis P. J.;Kovacs A.;Lagache G.;Lehnert M.;Mao M. Y.;Menten K. M.;Norris R. P.;Omont A.;Tatemastu K.;Weiss A.;Zheng Z.
莱曼α斑点（实验室）是空间延伸的莱曼α星云，可见于高红移。实验室里莱曼α辐射的起源仍然不清楚，还在争论中。为了研究它们的加热机制，我们提供了澳大利亚望远镜紧凑阵列（ATCA）对原星团J2143-4423中4个实验室在z=2.38处20厘米射电发射的观测结果，以及赫舍尔PACS和SPIRE对远红外（FIR）发射的测量结果。4个实验室中，B6和B7分别以67+/-17微焦和77+/-16微焦的通量在无线电中检测到，B5在3西格玛（51+/-16微焦）边缘检测到。对于所有探测到的信号源，它们的无线电位置都与实验室的中心位置一致。在FIR中也明显检测到B6和B7。通过不同的模板拟合数据，我们得到了B6和B7的红移分别为2.20和2.20，这与莱曼α发射的红移在不确定度范围内是一致的，表明这两个FIR源都可能与实验室有关。B6和B7中相关的FIR发射和高恒星形成率强烈支持星系中的恒星形成，这是两个实验室lyman α发射的重要动力来源。然而，另外两个，B1和B5，主要是由活动星系核或其他能量来源驱动的，但主要不是由恒星形成驱动的。总的来说，实验室的能源来源相当多样化。
Lyman alpha blobs (LABs) are spatially extended lyman alpha nebulae seen at high redshift. The origin of Lyman alpha emission in the LABs is still unclear and under debate. To study their heating mechanism(s), we present Australia Telescope Compact Array (ATCA) observations of the 20 cm radio emission and Herschel PACS and SPIRE measurements of the far-infrared (FIR) emission towards the four LABs in the protocluster J2143-4423 at z=2.38. Among the four LABs, B6 and B7 are detected in the radio with fluxes of 67+/-17 microJy and 77+/-16 microJy, respectively, and B5 is marginally detected at 3 sigma (51+/-16 microJy). For all detected sources, their radio positions are consistent with the central positions of the LABs. B6 and B7 are obviously also detected in the FIR. By fitting the data with different templates, we obtained redshifts of 2.20for B6 and 2.20for B7 which are consistent with the redshift of the lyman alpha emission within uncertainties, indicating that both FIR sources are likely associated with the LABs. The associated FIR emission in B6 and B7 and high star formation rates strongly favor star formation in galaxies as an important powering source for the lyman alpha emission in both LABs. However, the other two, B1 and B5, are predominantly driven by the active galactic nuclei or other sources of energy still to be specified, but not mainly by star formation. In general, the LABs are powered by quite diverse sources of energy.