Constraining Lyman-alpha spatial offsets at 3 < z < 5.5 from VANDELS slit spectroscopy

Constraining Lyman-alpha spatial offsets at 3 < z < 5.5 from VANDELS slit spectroscopy
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根据 VANDELS 狭缝光谱将 Lyman-alpha 空间偏移限制在 3 < z < 5.5

DOI:
10.1093/mnras/stz1768
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发表时间:
2019
影响因子:
4.8
通讯作者:
Garilli, B
Garilli, B
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hoag, A;Treu, T;Pentericci, L;Amorin, R;Bolzonella, M;Bradač, M;Castellano, M;Cullen, F;Fynbo, J P;Garilli, B

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我们限制了10300个高红移(3 <z< 5.5)莱曼破裂星系(LBG)中相对于静止坐标系紫外发射的空间偏移莱曼α发射(Ly α)的分布,这些星系表现出来自VANDELS的Ly α发射,VANDELS是CANDELS超深巡天和钱德拉深场南场的VLT/VIMOS狭缝光谱巡天(总计0.2度)。由于狭缝光谱仅提供一个空间维度,我们使用贝叶斯推断来恢复潜在的二维Ly α空间偏移分布。我们使用二维圆形高斯分布来建模,由单个参数σr,Ly α定义,标准差以极坐标表示。在我们样本的整个红移范围内(3 <z< 5.5),我们发现$\sigma _{r,\mathrm{Ly}\,\alpha }=1.70^{+0.09}_{-0.08}$ kpc($68\hbox{percent}$ conf.),对应于0${^{\prime\prime}_{.}}$ 25,= 4.5。我们还发现,σr,Ly α随红移而显著减小。由于Ly α的空间偏移会导致狭缝损失,因此σr,Ly α随红移的减小可以部分解释在同一时间段内文献中观测到的Ly α发射体比例的增加,尽管不确定性仍然太大,无法得出强有力的结论。如果σr,Ly α在再电离时期继续减少,那么在此时期观测到的星系Ly α透射率的减少可能需要比目前推断的更高的中性氢分数。相反,如果空间偏移随着星系际介质不透明度的增加而增加,那么狭缝损失可以解释在z> 6时观测到的Ly α透射率下降的部分原因。为了解决这个问题,需要在6 <z< 8处对Ly α和UV连续谱进行空间分辨观测。
We constrain the distribution of spatially offset Lyman-alpha emission (Ly α) relative to rest-frame ultraviolet emission in ∼300 high redshift (3 <z< 5.5) Lyman-break galaxies (LBGs) exhibiting Ly α emission from VANDELS, a VLT/VIMOS slit-spectroscopic survey of the CANDELS Ultra Deep Survey and Chandra Deep Field South fields (≃0.2 deg2total). Because slit spectroscopy only provides one spatial dimension, we use Bayesian inference to recover the underlying two-dimensional Ly α spatial offset distribution. We model the distribution using a two-dimensional circular Gaussian, defined by a single parameter σr,Ly α, the standard deviation expressed in polar coordinates. Over the entire redshift range of our sample (3 <z< 5.5), we find $\sigma _{r,\mathrm{Ly}\,\alpha }=1.70^{+0.09}_{-0.08}$ kpc ($68\hbox{ per cent}$ conf.), corresponding to ∼0${^{\prime\prime}_{.}}$25 at 〈z〉 = 4.5. We also find that σr,Ly αdecreases significantly with redshift. Because Ly α spatial offsets can cause slit losses, the decrease in σr,Ly αwith redshift can partially explain the increase in the fraction of Ly α emitters observed in the literature over this same interval, although uncertainties are still too large to reach a strong conclusion. If σr,Ly αcontinues to decrease into the reionization epoch, then the decrease in Ly α transmission from galaxies observed during this epoch might require an even higher neutral hydrogen fraction than what is currently inferred. Conversely, if spatial offsets increase with the increasing opacity of the intergalactic medium, slit losses may explain some of the drop in Ly α transmission observed atz> 6. Spatially resolved observations of Ly α and UV continuum at 6 <z< 8 are needed to settle the issue.
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