论文标题
FIR/sub-mm波长的第一星系的签名
Signatures of first galaxies at FIR/sub-mm wavelengths
论文作者
论文摘要
我们通过应用原始粉尘发射的分析模型来探索使用通用远红外/亚毫米望远镜检测第一星系的可能性。如先前的作品所示，红移的星系$ z> 7 $体验了强大的负K校正，以使类似质量的系统在较高的$ z $下更加明亮。此外，在给定的质量和$ z $的情况下，我们的模型预测，亮度通量与原始源的尘埃金属比（$ d/m $）成比例地增加。我们评估了不同$ z> 7 $的模型源的可观察性，该模型源是观察到的调查区域（$δΩ$）和通用仪器的灵敏度（$ s $）的函数。假设$δΩ\ sim 10〜 {\ rm deg}^2 $和一个可靠的$ s \ sim 1〜μ {\ rm jy} $，以将来进行调查，我们可以确保检测至少一个典型源，其中一种具有$ d/m \ sim 5/m \ sim 5 \ sim 5 \ times10^{ - times10^{ - 3} $ z> 7 $ 7 $ 7 $ 7 $ 7 $。对于$ s \ gtrsim 1〜μ {\ rm jy} $和$δω\ lyseSim 10〜 {\ rm veg}^2 $，高于典型的$ d/m $，才能在$ z> 7 $中检测至少一个单独的源。模型星系的可观察性也受尘埃谷物的尺寸分布的影响，特别是$ Z $。
We explore the possibility of detecting first galaxies with a generic far-infrared/sub-millimeter telescope by applying an analytical model of primordial dust emission. As shown in previous works, galaxies at redshifts $z>7$ experience a strong negative K-correction in such a way that systems of similar masses are brighter at higher $z$. In addition, at a given mass and $z$, our model predicts that luminosity fluxes increase proportionally to the dust-to-metal ratios ($D/M$) of primeval sources. We evaluate the observability of model sources at different $z>7$ as a function of the observed survey area ($ΔΩ$) and sensitivity ($S$) of a generic instrument. Assuming $ΔΩ\sim 10~{\rm deg}^2$ and a plausible $S \sim 1~μ{\rm Jy}$ for a near future survey, we could assure the detection of at least one typical source with $D/M \sim 5\times10^{-3}$ at $z>7$. For $S\gtrsim 1~μ{\rm Jy}$ and $ΔΩ\lesssim 10~{\rm deg}^2$, higher than typical $D/M$ are required to detect at least one individual source at $z>7$. The observability of model galaxies is also affected by the size distribution of dust grains, specially towards higher $z$.
