Molecular Signals from Primordial Clouds at High Redshift
Molecular Signals from Primordial Clouds at High Redshift
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来自高红移原始云的分子信号
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
D. Tosti
中科院分区：
文献类型：
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作者：
R. Maoli;V. Ferrucci;F. Melchiorri;M. Signore;D. Tosti
从重组后的宇宙中探测宇宙信号是现代宇宙学的主要目标之一。在之前的文章中，我们强调了通过LiH分子的弹性共振散射在倾倒初级CBR各向异性和提高次级信号方面的作用。在这里，我们将我们的分析扩展到原始云的所有演化阶段，从线性阶段开始，通过转弯和非线性坍缩。我们已经对CDM情景中的原始云进行了计算，更一般地说，对一组具有不同质量和不同旋转红移的云进行了计算，在这种情况下，没有参考任何特定的结构形成情景。我们发现崩塌的第一阶段，对于$t/t_{free-fall}=0.05div 0.2$是同时检测前两个LiH旋转线的最佳阶段。观测频率在30至250千兆赫之间，线宽${Delta
The possibility to detect cosmological signals from the post-recombination Universe is one of the main aims of modern cosmology. In a previous paper we emphasized the role that elastic resonant scattering through LiH molecules can have in dumping primary CBR anisotropies and raising secondary signals. Here we extend our analysis to all the evolutionary stages of a primordial cloud, starting with the linear phase, through the turn-around and to the non linear collapse. We have done calculations for proto-clouds in a CDM scenario and, more generally, for a set of clouds with various masses and various turn-around redshifts, in this case without referring to any particular structure formation scenario. We found that the first phase of collapse, for $t/t_{free-fall}=0.05div 0.2$ is the best one for simultaneous detection of the first two LiH rotational lines. The observational frequency falls between 30 and 250 GHz and the line width ${Delta
uover
u}$ is between $10^{-5}$ and $10^{-4}$. As far as we know this is the most favourable process to detect primordial clouds before they start star formation processes.