发现发射窄线射线的$γ$ -赛弗特1星系FBQS J1644 +2619的宿主星系
Uncovering the host galaxy of the $γ$-ray-emitting narrow-line Seyfert 1 galaxy FBQS J1644+2619
摘要：
射电强窄线塞弗特1（NLSy 1）星系中$γ$射线发射的发现，对大质量黑洞（> 10 $^8$ M $_{\odot}$）发射相对论喷流的必要性提出了质疑。我们目前的近红外数据的$γ$射线发射NLSy 1 FBQS J1644+2619，收集使用相机CIRCE（加那利群岛红色相机实验）在10.4米大加那利望远镜调查其宿主星系的结构特性，并推断黑洞质量。2D表面亮度剖面由核和凸起部分与Sérsic剖面的组合模拟，其指数$n$ = 3.7，指示椭圆星系。主星系的结构参数与椭圆星系的有效半径和表面亮度与绝对星等的相关性是一致的。从凸起的光度，我们估计黑洞的质量为（2.1 $\pm$ 0.2）$\times$ 10 $^8$ M $_{\odot}$，与无线电响亮的活动星系核的特征值一致。
英文摘要：
The discovery of $γ$-ray emission from radio-loud narrow-line Seyfert 1 (NLSy1) galaxies has questioned the need for large black hole masses (> 10$^8$ M$_{\odot}$) to launch relativistic jets. We present near-infrared data of the $γ$-ray-emitting NLSy1 FBQS J1644+2619 that were collected using the camera CIRCE (Canarias InfraRed Camera Experiment) at the 10.4-m Gran Telescopio Canarias to investigate the structural properties of its host galaxy and to infer the black hole mass. The 2D surface brightness profile is modelled by the combination of a nuclear and a bulge component with a Sérsic profile with index $n$ = 3.7, indicative of an elliptical galaxy. The structural parameters of the host are consistent with the correlations of effective radius and surface brightness against absolute magnitude measured for elliptical galaxies. From the bulge luminosity, we estimated a black hole mass of (2.1$\pm$0.2) $\times$10$^8$ M$_{\odot}$, consistent with the values characterizing radio-loud active galactic nuclei.
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