Intermediate-mass black holes: finding of episodic, large-scale and powerful jet activity in a dwarf galaxy
Intermediate-mass black holes: finding of episodic, large-scale and powerful jet activity in a dwarf galaxy
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中等质量黑洞：在矮星系中发现间歇性、大规模和强大的喷流活动
DOI：
10.48550/arxiv.2302.06214
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发表时间：
2023-02
影响因子：
4.8
通讯作者：
Chang Ning
中科院分区：
文献类型：
--
作者：
Yang Jun;Paragi Zsolt;Frey Sándor;Gurvits Leonid I.;Liao Mai;Liu Xiang;Cui Lang;Yang Xiaolong;Chen Wen;Varenius Eskil;Conway John E.;Chen Rurong;Chang Ning
矮小星系的特点是光度非常低，质量也很低。由于大质量黑洞的显著吸积和抛射活动，一些矮小星系还拥有低光度活动星系核(AGN)。在少数矮化活动星系核中，甚长基线干涉测量(VLBI)观测发现了微弱的非热射电波发射。J090613.77+561015.2是一颗矮小活动星系核，拥有一个中等质量黑洞，质量为MbH=3.6+5.9MSun 2.3×105Msun，射电核内呈现罕见的两分量射电结构。J090613.77+561015.2是一颗中等质量的活动星系核，质量为−=3.6+5.9MSun。为了进一步探索它们的性质，即IMBH喷流活动，我们利用欧洲VLBI网络(EVN)在1.66 GHz和4.99 GHz进行了额外的深度观测。我们发现了更弥散的发射区和结构细节。这些新的EVN成像结果使我们能够揭示出一种双面喷流形态，其尺寸可达约150ms(投影长度∼140PC)，射电光度约为3×1038erg S−1。峰值特征有一个光学上很薄的射电频谱，因此更有可能是一个相对年轻的喷射物，而不是喷气式飞机的基地。对SDSS J090613.77+561015.2的EVN研究表明，矮小活动星系核中存在周期性的、相对较大规模和较强的IMBH喷流活动。此外，我们收集了一小部分VLBI探测到的矮小活动星系核，并研究了它们与正常活动星系核的联系。我们注意到，矮小活动星系核中的这些射电源往往具有陡峭的频谱和较小的线性尺寸，可能代表了缩小的幕式喷流活动产生的喷出物……
Dwarf galaxies are characterised by a very low luminosity and low mass. Because of significant accretion and ejection activity of massive black holes, some dwarf galaxies also host low-luminosity active galactic nuclei (AGNs). In a few dwarf AGNs, very long baseline interferometry (VLBI) observations have found faint non-thermal radio emission. SDSS J090613.77+561015.2 is a dwarf AGN owning an intermediate-mass black hole (IMBH) with a mass of MBH=3.6+5.9−2.3×105Msun and showing a rarely-seen two-component radio structure in its radio nucleus. To further probe their nature, i.e. the IMBH jet activity, we performed additional deep observations with the European VLBI Network (EVN) at 1.66 GHz and 4.99 GHz. We find the more diffuse emission regions and structure details. These new EVN imaging results allow us to reveal a two-sided jet morphology with a size up to about 150 mas (projected length ∼ 140 pc) and a radio luminosity of about 3×1038 erg s −1 . The peak feature has an optically thin radio spectrum and thus more likely represents a relatively young ejecta instead of a jet base. The EVN study on SDSS J090613.77+561015.2 demonstrates the existence of episodic, relatively large-scale and powerful IMBH jet activity in dwarf AGNs. Moreover, we collected a small sample of VLBI-detected dwarf AGNs and investigated their connections with normal AGNs. We notice that these radio sources in the dwarf AGNs tend to have steep spectra and small linear sizes, and possibly represent ejecta from scaled-down episodic jet activity...