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arXiv 2201.04674astro-ph.GA
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Lensed Lyman-Alpha MUSE Arcs样品(LLAMAS):I.扩展莱曼α晕和空间偏移的表征

The Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS) : I. Characterisation of extended Lyman-alpha haloes and spatial offsets

A. Claeyssens, J. Richard, J. Blaizot, T. Garel, H. Kusakabe, R. Bacon, F. E. Bauer, L. Guaita, A. Jeanneau, D. Lagattuta, F. Leclercq, M. Maseda, J. Matthee, T… 展开作者

A. Claeyssens, J. Richard, J. Blaizot, T. Garel, H. Kusakabe, R. Bacon, F. E. Bauer, L. Guaita, A. Jeanneau, D. Lagattuta, F. Leclercq, M. Maseda, J. Matthee, T. Nanayakkara, R. Pello, T. T. Thai, P. Tuan-Anh, A. Verhamme, E. Vitte, L. Wisotzki

摘要:

本文介绍了从MUSE和HST观测的17个透镜星系团中选出的LensedLyman-AlphaMUSE弧样品(LLAMAS)。该样品由603个连续微弱(-23<M_UV<-14)透镜莱曼α发射体(产生959个图像)组成,光谱红移在2.9和6.7之间。结合集群放大的功率与3D光谱观测,我们能够揭示268莱曼α发射器的分辨形态学特性。我们使用一个正向建模的方法来模拟莱曼α和静止帧紫外连续辐射分布在源平面和测量的空间范围,椭圆度和空间偏移之间的UV和莱曼α发射。我们发现一个显着的相关性之间的UV连续和莱曼α空间范围。我们的表征的莱曼α晕表明,晕的大小与宿主星系的物理性质(SFR,莱曼α EW和莱曼α线FWHM)。我们发现,48%的莱曼α晕是最好的拟合椭圆形的发射分布与中位轴比q=0.48。我们观察到,60%的星系检测到的紫外线和莱曼α发射显示出显着的空间偏移(三角洲)。我们测量整个样本的中位偏移量Delta= 0.58 \pm 0.14 kpc。通过比较空间偏移值与UV分量的大小,我们发现40%的偏移可能是由于UV分量中的恒星形成子结构,而较大的偏移更可能是由于较大的距离过程,如环星系介质内的散射效应或来自微弱卫星或合并星系的发射。放大辐射流体动力学模拟的一个典型的莱曼α发射星系的比较显示出良好的协议与LLAMAS星系,并表明明亮的恒星形成团块和卫星星系可以产生类似的空间偏移分布。(节略)

英文摘要:

We present the Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS) selected from MUSE and HST observations of 17 lensing clusters. The sample consists of 603 continuum-faint (-23<M_UV<-14) lensed Lyman-alpha emitters (producing 959 images) with spectroscopic redshifts between 2.9 and 6.7. Combining the power of cluster magnification with 3D spectroscopic observations, we are able to reveal the resolved morphological properties of 268 Lyman-alpha emitters. We use a forward modelling approach to model both Lyman-alpha and rest-frame UV continuum emission profiles in the source plane and measure spatial extent, ellipticity and spatial offsets between UV and Lyman-alpha emission. We find a significant correlation between UV continuum and Lyman-alpha spatial extent. Our characterization of the Lyman-alpha haloes indicates that the halo size is linked to the physical properties of the host galaxy (SFR, Lyman-alpha EW and Lyman-alpha line FWHM). We find that 48% of Lyman-alpha haloes are best-fitted by an elliptical emission distribution with a median axis ratio of q=0.48. We observe that 60% of galaxies detected both in UV and Lyman-alpha emission show a significant spatial offset (Delta). We measure a median offset of Delta= 0.58 \pm 0.14 kpc for the entire sample. By comparing the spatial offset values with the size of the UV component, we show that 40% of the offsets could be due to star-forming sub-structures in the UV component, while the larger offsets are more likely due to larger distance processes such as scattering effects inside the circumgalactic medium or emission from faint satellites or merging galaxies. Comparisons with a zoom-in radiative hydrodynamics simulation of a typical Lyman-alpha emitting galaxy show a good agreement with LLAMAS galaxies and indicate that bright star-formation clumps and satellite galaxies could produce a similar spatial offsets distribution. (abridged)

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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