论文标题
与星形星系中X射线选择的活性银河核的恒星形成的比较
Comparison of the star formation of X-ray selected active galactic nuclei in eFEDS with star-forming galaxies
论文作者
论文摘要
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）相对于非AGN恒星形成系统的（$ \ rm 0.5 <z <z <1.5 $）。为此，我们使用$ \ sim 17000 $来源编译了参考银河目录。这两个样品的光度覆盖率相同，从光学到远红外。我们构建了所有来源的光谱能量分布（SED），并使用CIGALE代码拟合它们，并利用两个样品的模板和参数网格。我们说明质量不完整，并从两个数据集中排除静态系统。这些使我们能够以统一的方式比较两个人群的SFR，从而最大程度地减少系统效应。基于我们的分析，在低和中度L $ _x $（$ \ rm l_ {x，2-10kev} <10^{44} \，ergs^{ - 1} $）中具有较低的SFR，最多与以前的研究相等，与星形的星系相同。 EFEDS数据集中可用的大量发光X射线AGN，使我们能够以更高的l $ _x $扩展调查，以测试以前的暂定结果。在$ \ rm l_ {x，2-10kev}> 10^{44.2} \，ergs^{ - 1} $，与星形质量的系统相比，AGN的SFR显着增强，$ \ sim 30 \％$，用于恒星质量，$ \ rm \ rm 10.5 <log <log \ od \ od，[m_]在先前的研究中发现的迹象。最大的来源$ \ rm log \，[m _*（m _ \ odot）]> 11.5 $，出现一个平坦的sfr $ _ {norm} $ - l $ _x $关系高达$ \ rm l_ {x，x，2-10kev}星系。但是，在较高的l $ _x $（$ \ rm l_ {x，2-10kev} \ sim 10^{45} \，ergs^{ - 1} $）时，我们发现这些大型AGN主机的SFR可能与非AGN系统相比可以增强。
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.
