论文标题
来自SARAS3宇宙黎明的SARAS3无检测的天体物理约束21厘米信号
Astrophysical Constraints from the SARAS3 non-detection of the Cosmic Dawn Sky-Averaged 21-cm Signal
论文作者
论文摘要
对红移21厘米的原子氢的观察结果导致了21厘米功率谱上的几个上限，并在$ z \ sim17 $上对天空平均信号进行了暂定检测。 SARAS3实验最近通过边缘低频天线制成，该主张最近报道了非检测，并且是唯一足够强的上限，足以限制宇宙黎明天体物理学。我们使用这些数据来限制大爆炸后200百万美元的$ \ sim $ \ sim（$ z \ 20 $）。我们发现，使用贝叶斯数据分析发现，数据散布（68％的信心）在暗物质光环中的无线电星系，质量为$ 4.4 \ times10^{5} $ m $ _ \ odot \ odot \ odot \ odot \ lisesim m \ Lessim m \ Lessim m \ Lessim 1.1 \ times10^{7} $ m $ m $ _ \ is $ _ \ od $ s $ s $ s $ s $ s $ s $ s $ s $ s $ s $ s y $ 20美元和星系，其中$> 5 $％的气体转化为星星。每颗星形成率$ l_ \ mathrm {r}/\ mathrm {sfr} \ gtrsim 1.549 \ times 10^{25} $ w hz $^{ - 1} $ m $ m $ m $ _ \ odot^{ - y yr at 150，同步量无线电背景超过CMB的$ \ gtrsim 6％$ in 1.42 GHz。
Observations of the redshifted 21-cm line of atomic hydrogen have resulted in several upper limits on the 21-cm power spectrum and a tentative detection of the sky-averaged signal at $z\sim17$. Made with the EDGES Low-Band antenna, this claim was recently disputed by the SARAS3 experiment, which reported a non-detection and is the only available upper limit strong enough to constrain cosmic dawn astrophysics. We use these data to constrain a population of radio-luminous galaxies $\sim 200$ million years after the Big Bang ($z\approx 20$). We find, using Bayesian data analysis, that the data disfavours (at 68% confidence) radio-luminous galaxies in dark matter halos with masses of $4.4\times10^{5}$ M$_\odot \lesssim M \lesssim 1.1\times10^{7}$M$_\odot$ (where $M_\odot$ is the mass of the Sun) at $z = 20$ and galaxies in which $>5$% of the gas is converted into stars. The data disfavour galaxies with radio luminosity per star formation rate of $L_\mathrm{r}/\mathrm{SFR} \gtrsim 1.549 \times 10^{25}$ W Hz$^{-1}$M$_\odot^{-1}$ yr at 150 MHz, a thousand times brighter than today, and, separately, a synchrotron radio background in excess of the CMB by $\gtrsim 6%$ at 1.42 GHz.
