用钱德拉深入观测矮星系中的 eFEDS AGN 候选者

Adonis A. Sanchez, Amy E. Reines, Akos Bogdan, Ralph P. Kraft
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引用次数: 0

摘要

要想了解早期宇宙中 "种子 "黑洞的起源和过程,就必须能够准确地分辨出附近矮星系中活跃的大质量黑洞(BHs)。我们展示了钱德拉X射线天文台(Chandra X-ray Observatory)对三个本地矮星系(M$_{*}$ $\leqslant 3\times 10^{9}$ M$_\odot$,z $\leqslant$ 0.15)样本的观测结果,这三个矮星系以前曾被确定为活动星系核(AGN)的候选宿主。这些星系是从NASA-Sloan图集(NSA)中挑选出来的,在eROSITA最终赤道深度巡天(eFEDS)中有空间重合的X射线探测。我们最新的钱德拉数据在其中两个目标星系中发现了三个X射线点源,其光度介于log(L$_{\rm \text{2-10 keV}}$ [erg s$^{-1}$]) = 39.1和40.4之间。我们的研究结果支持在这两个星系中存在一个AGN,在其中一个星系中存在一个ULX。对于AGN,我们估计其BH质量为$M_{/rm BH}\sim 10^{5-6}M_\odot$,爱丁顿比为 $\sim 10^{-3}$。
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A Deeper Look into eFEDS AGN Candidates in Dwarf Galaxies with Chandra
The ability to accurately discern active massive black holes (BHs) in nearby dwarf galaxies is paramount to understanding the origins and processes of "seed" BHs in the early Universe. We present Chandra X-ray Observatory observations of a sample of three local dwarf galaxies (M$_{*}$ $\leqslant 3 \times 10^{9}$ M$_\odot$, z $\leqslant$ 0.15) previously identified as candidates for hosting active galactic nuclei (AGN). The galaxies were selected from the NASA-Sloan Atlas (NSA) with spatially coincident X-ray detections in the eROSITA Final Equatorial Depth Survey (eFEDS). Our new Chandra data reveal three X-ray point sources in two of the target galaxies with luminosities between log(L$_{\rm \text{2-10 keV}}$ [erg s$^{-1}$]) = 39.1 and 40.4. Our results support the presence of an AGN in these two galaxies and a ULX in one of them. For the AGNs, we estimate BH masses of $M_{\rm BH} \sim 10^{5-6} M_\odot$ and Eddington ratios on the order of $\sim 10^{-3}$.
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