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arXiv 2103.16571astro-ph.GA
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用Spitzer/IRAC数据研究z~10到z~6星系恒星质量函数:宇宙时第一个回旋中星系星晕质量比没有显著变化

Galaxy Stellar Mass Functions from z~10 to z~6 using the Deepest Spitzer/IRAC Data: No Significant Evolution in the Stellar-to-Halo Mass Ratio of Galaxies in the First Gyr of Cosmic Time

Mauro Stefanon, Rychard J. Bouwens, Ivo Labbé, Garth D. Illingworth, Valentino Gonzalez, Pascal A. Oesch

摘要:

我们提出了新的恒星质量函数在$z\sim6$,$z\sim7$,$z\sim8$,$z\sim9$和,第一次,$z\sim10$,构建从$\sim800$莱曼-Break星系以前确定的XDF/UDF,平行和5个坎德尔领域。我们的研究是独特的,由于(1)更深($\sim200$小时)在$3.6μ$ m和$4.5μ$ m的广域斯皮策/IRAC成像从斯皮策(GREATS)计划的货物再电离时代广域宝库和(2)考虑$z\sim6-10$源超过$3\times$比以前的HST+斯皮策研究更大的区域。斯皮策/IRAC的数据使$\ge2σ$休息帧光学探测的一个前所未有的$50\%$星系下降到恒星质量极限的$\sim10^{8}\mathcal{M}_\odot$在所有的红移。Schechter拟合我们的体积密度表明,特征质量$\mathcal{M}^*$和$z\sim6$和$z\sim8$之间的归一化因子$ϕ^*$的组合演变。恒星质量密度(SMD)在$\sim500$ Myr中在$z\sim10$和$z\sim6$之间增加了$\sim1000\times$,有迹象表明在$z\sim10$和$z\sim8$之间有更陡峭的演化,类似于以前报道的恒星形成率密度的趋势。引人注目的是,与Bolshoi-Planck模拟相匹配的丰度表明,晕质量密度的演变速度与$z\sim10$和$z\sim4$之间的SMD大致相同。我们的研究结果表明,恒星晕质量比,代理的恒星形成效率,不改变显着超过巨大的恒星质量积累发生从$z\sim10$到$z\sim6$,表明组装的恒星质量密切反映了晕质量的积累在宇宙历史的第一个$\sim1$陀螺。JWST准备将这些结果扩展到$z\gtrsim10$的“第一个星系”时代。

英文摘要:

We present new stellar mass functions at $z\sim6$, $z\sim7$, $z\sim8$, $z\sim9$ and, for the first time, $z\sim10$, constructed from $\sim800$ Lyman-Break galaxies previously identified over the XDF/UDF, parallels and the five CANDELS fields. Our study is distinctive due to (1) the much deeper ($\sim200$ hour) wide-area Spitzer/IRAC imaging at $3.6μ$m and $4.5μ$m from the GOODS Re-ionization Era wide Area Treasury from Spitzer (GREATS) program and (2) consideration of $z\sim6-10$ sources over a $3\times$ larger area than previous HST+Spitzer studies. The Spitzer/IRAC data enable $\ge2σ$ rest-frame optical detections for an unprecedented $50\%$ of galaxies down to a stellar mass limit of $\sim10^{8}\mathcal{M}_\odot$ across all redshifts. Schechter fits to our volume densities suggest a combined evolution in characteristic mass $\mathcal{M}^*$ and normalization factor $ϕ^*$ between $z\sim6$ and $z\sim8$. The stellar mass density (SMD) increases by $\sim1000\times$ in the $\sim500$ Myr between $z\sim10$ and $z\sim6$, with indications of a steeper evolution between $z\sim10$ and $z\sim8$, similar to the previously-reported trend of the star-formation rate density. Strikingly, abundance matching to the Bolshoi-Planck simulation indicates halo mass densities evolving at approximately the same rate as the SMD between $z\sim10$ and $z\sim4$. Our results show that the stellar-to-halo mass ratios, a proxy for the star-formation efficiency, do not change significantly over the huge stellar mass build-up occurred from $z\sim10$ to $z\sim6$, indicating that the assembly of stellar mass closely mirrors the build-up in halo mass in the first $\sim1$ Gyr of cosmic history. JWST is poised to extend these results into the "first galaxy" epoch at $z\gtrsim10$.

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