Beamed Lyα emission through outflow-driven cavities

Beamed Lyα emission through outflow-driven cavities
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通过流出驱动腔进行光束 Lyα 发射

DOI:
10.1051/0004-6361/201322949
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发表时间:
--
影响因子:
6.5
通讯作者:
Niemeyer
Niemeyer
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Behrens;Dijkstra;Niemeyer

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我们研究了Lyα光子通过简化的各向异性气体分布的辐射传输,它代表了流行的壳层模型的物理激励扩展。我们的研究是基于这样一个概念:(I)壳模型并不总是重现观测到的Lyα谱线轮廓;(Ii)(典型的)壳模型不允许电离光子逃逸;以及(Iii)风是更复杂的各向异性现象的观察和预期。我们考察了倾角对Lyα谱、相对通量和逃逸分数的影响。我们发现,根据模型的参数范围,通量被增强/抑制的因素多达几个,如果我们忽略尘埃,对应于相同幅度的等效宽度的增加。一般来说,较低的平均光学深度往往会减少各向异性的影响,正如预期的那样。我们发现,在系统速度的光谱中观察到的峰值--有时是三个峰值--与沿着视线的低光学深度腔的存在之间存在关联。这在寻找从高红移星系泄漏的电离光子方面可能很重要,因为这些光子也将能够通过空腔逃逸。
We investigate the radiative transfer of Lyαphotons through simplified anisotropic gas distributions, which represent physically motivated extensions of the popular shell models. Our study is motivated by the notion that (i) shell models do not always reproduce observed Lyαspectral line profiles; (ii) (typical) shell models do not allow for the escape of ionizing photons; and (iii) the observation and expectation that winds are more complex, anisotropic phenomena. We examine the influence of inclination on the Lyαspectra, relative fluxes and escape fractions. We find the flux to be enhanced/suppressed by factors up to a few depending on the parameter range of the models, corresponding to a boost in equivalent width of the same amplitude if we neglect dust. In general, lower mean optical depths tend to reduce the impact of anisotropies as is expected. We find a correlation between an observed peak in the – occasionally triple-peaked – spectrum at the systemic velocity and the existence of a low optical depth cavity along the line of sight. This can be of importance in the search for ionizing photons leaking from high- redshift galaxies since these photons will also be able to escape through the cavity.
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发表时间: 2006
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影响因子: --
作者:
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