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arXiv 2409.01286astro-ph.GA
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JADES中恒星质量完备样本星系的电离性质:解决再电离纪元宇宙电离光子预算危机

Ionising properties of galaxies in JADES for a stellar mass complete sample: resolving the cosmic ionising photon budget crisis at the Epoch of Reionisation

C. Simmonds, S. Tacchella, K. Hainline, B. D. Johnson, D. Puskás, B. Robertson, W. M. Baker, R. Bhatawdekar, K. Boyett, A. J. Bunker, P. A. Cargile, S. Carniani… 展开作者

C. Simmonds, S. Tacchella, K. Hainline, B. D. Johnson, D. Puskás, B. Robertson, W. M. Baker, R. Bhatawdekar, K. Boyett, A. J. Bunker, P. A. Cargile, S. Carniani, J. Chevallard, M. Curti, E. Curtis-Lake, Z. Ji, G. C. Jones, N. Kumari, I. Laseter, R. Maiolino, M. V. Maseda, P. Rinaldi, A. Stoffers, H. Übler, N. C. Villanueva, C. C. Williams, C. Willot, J. Witstok, Y. Zhu

AI总结:

基于JADES巡天中15721个星系样本,利用Prospector拟合测光数据,发现电离光子产生效率随红移和紫外星等的演化比先前报道更平缓,并识别出两个不同星族;结合光度函数约束宇宙电离光子预算,表明M_UV在-16到-20之间的星系可产生足够光子电离宇宙。

摘要:

我们利用JWST高级深河外星系巡天(JADES)的NIRCam成像数据,研究了15721个星系在$3 \leq z_{\rm{phot}} \leq 9$范围内的电离性质,该样本在恒星质量低至log(M$_{\star}$/[M$_{\odot}$])$\approx 7.5$时具有90%的完备性。在全部样本中,有1620个星系具有来自文献的光谱红移测量。我们使用光谱能量分布拟合代码\texttt{Prospector}拟合所有可用的测光数据,并推断星系性质。我们发现电离光子产生效率(\xion\\)随红移和紫外星等的变化比先前报道的显著更平缓。有趣的是,我们观察到\xion\\中存在两个不同的星族,它们以爆发性(由SFR$_{10}$/SFR$_{100}$给出)区分。两个星族在$z$和M$_{\rm{UV}}$上表现出相同的演化,但具有不同的\xion\\归一化。我们将更具代表性的$\log(ξ_{\rm{ion}} (z,\text{M}_{\rm{UV}}))$关系(占样本的$\sim96$\\%)与文献中的光度函数卷积,以对宇宙电离光子预算施加约束。通过结合我们的结果,我们发现我们的一个模型可以匹配$z\lesssim6$处\lya\\森林的观测约束。我们得出结论,采用合理的逃逸分数,M$_{\rm{UV}}$在$-16$到$-20$之间的星系可以产生足够的电离光子来电离宇宙,而不会超过所需的电离光子预算。

英文摘要:

We use NIRCam imaging from the JWST Advanced Deep Extragalactic Survey (JADES) to study the ionising properties of a sample of 15721 galaxies at $3 \leq z_{\rm{phot}} \leq 9$, 90\% complete in stellar mass down to log(M$_{\star}$/[M$_{\odot}$])$\approx 7.5$. Out of the full sample, 1620 of the galaxies have spectroscopic redshift measurements from the literature. We use the spectral energy distribution fitting code \texttt{Prospector} to fit all available photometry and infer galaxy properties. We find a significantly milder evolution of the ionising photon production efficiency (\xion\/) with redshift and UV magnitude than previously reported. Interestingly, we observe two distinct populations in \xion\/, distinguished by their burstiness (given by SFR$_{10}$/SFR$_{100}$). Both populations show the same evolution with $z$ and M$_{\rm{UV}}$, but have a different \xion\/ normalisation. We convolve the more representative $\log(ξ_{\rm{ion}} (z,\text{M}_{\rm{UV}}))$ relations (accounting for $\sim96$\% of the sample), with luminosity functions from literature, to place constraints on the cosmic ionising photon budget. By combining our results, we find that one of our models can match the observational constraints from the \lya\/ forest at $z\lesssim6$. We conclude that galaxies with M$_{\rm{UV}}$ between $-16$ and $-20$, adopting a reasonable escape fraction, can produce enough ionising photons to ionise the Universe, without exceeding the required ionising photon budget.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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