arXiv 2205.014512022-05-05astro-ph.GAastro-ph.CO

eFEDS中X射线选择活动星系核的恒星形成与恒星形成星系的比较

Comparison of the star formation of X-ray selected active galactic nuclei in eFEDS with star-forming galaxies

G. Mountrichas, V. Buat, G. Yang, M. Boquien, D. Burgarella, L. Ciesla, K. Malek, R. Shirley

备注：: Accepted for publication in A&A. 14 pages, 7 figures, 2 tables
发表信息：: A&A 663, A130 (2022)
DOI：: 10.1051/0004-6361/202243254

摘要：

我们在eROSITA最终赤道深度巡天（eFEDS）中使用$\sim 1800$ X射线活动星系核（AGN），它在X射线光度上跨越两个数量级，$\rm L_{X,2-10keV} \approx 10^{43-45}\,ergs^{-1}$，并比较它们的恒星形成率（SFR）相对于非AGN恒星形成系统，在$\rm 0.5<z<1.5$。为此，我们编制了一个参考星系目录与$\sim 17000$源。两种样品具有相同的光度覆盖范围，从光学到远红外。我们构建了所有源的光谱能量分布（SED），并使用CIGALE代码对它们进行拟合，对两个样本使用相同的模板和参数网格。我们占质量的不完整性，并排除静态系统从两个数据集。这使我们能够以统一的方式比较两个群体的SFR，最大限度地减少系统效应。根据我们的分析，活动星系核在低和中等L $_X$（$\rm L_{X,2-10keV} < 10^{44}\,ergs^{-1}$），有SFR是较低的，或最多，等于恒星形成星系，与以前的研究。大量的发光X射线活动星系核可在eFEDS数据集，使我们能够扩大我们的调查，在更高的L $_X$测试以前的，初步的结果。在$\rm L_{X,2-10keV} > 10^{44.2}\,ergs^{-1}$上，与恒星形成源相比，对于具有恒星质量$\rm 10.5 < log\,[M_*(M_\odot)] < 11.5$的系统，活动星系核的SFR似乎被$\sim 30\%$增强了，这证实了以前研究中发现的迹象。质量最大的源$\rm log\,[M_*(M_\odot)] > 11.5$，呈现平坦的SFR $_{norm}$ -L $_X$关系，直到$\rm L_{X,2-10keV} \sim 10^{44.5}\,ergs^{-1}$，SFR类似于恒星形成星系。然而，在更高的L $_X$（$\rm L_{X,2-10keV} \sim 10^{45}\,ergs^{-1}$），我们发现的迹象表明，这些大规模活动星系核主机的SFR可能会增强相比，非活动星系核系统。

英文摘要：

We use $\sim 1800$ X-ray Active Galactic Nuclei (AGN) in the eROSITA Final Equatorial-Depth Survey (eFEDS), that span over two orders of magnitude in X-ray luminosity, $\rm L_{X,2-10keV} \approx 10^{43-45}\,ergs^{-1}$, and compare their star-formation rate (SFR) relative to that of non-AGN star-forming systems, at $\rm 0.5<z<1.5$. For that purpose, we compile a reference galaxy catalogue with $\sim 17000$ sources. Both samples have the same photometric coverage, from optical to far-infrared. We construct the spectral energy distributions (SEDs) of all sources and fit them using the CIGALE code, utilizing the same templates and parametric grid for both samples. We account for the mass incompleteness and exclude quiescent systems from both datasets. These allow us to compare the SFR of the two populations in a uniform manner, minimising systematic effects. Based on our analysis, AGN at low and moderate L$_X$ ($\rm L_{X,2-10keV} < 10^{44}\,ergs^{-1}$), have SFR that is lower, or at most, equal to that of star-forming galaxies, in agreement with previous studies. The large number of luminous X-ray AGN available in the eFEDS dataset, enable us to expand our investigations at higher L$_X$ to test previous, tentative results. At $\rm L_{X,2-10keV} > 10^{44.2}\,ergs^{-1}$, the SFR of AGN appears enhanced, by $\sim 30\%$, compared to that of star-forming sources, for systems with stellar mass, $\rm 10.5 < log\,[M_*(M_\odot)] < 11.5$, confirming indications found in previous studies. The most massive sources $\rm log\,[M_*(M_\odot)] > 11.5$, present a flat SFR$_{norm}$-L$_X$ relation up to $\rm L_{X,2-10keV} \sim 10^{44.5}\,ergs^{-1}$, with SFR similar to that of star-forming galaxies. However, at higher L$_X$ ($\rm L_{X,2-10keV} \sim 10^{45}\,ergs^{-1}$), we find indications that the SFR of these massive AGN hosts may be enhanced compared to that of non-AGN systems.

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