论文标题
Nustar对高红移MEV Blazars的视角
NuSTAR perspective on high-redshift MeV blazars
论文作者
论文摘要
由于降压仪超过$ 10^{48} $ erg s $^{ - 1} $，其中心有功能强大的喷气机和超大型黑洞，Mev Blazars是宇宙中最极端的来源。最近，费米大区望远镜检测到了五个新的$γ$ ray，将Mev Blazars发射到Redshift $ Z = 3.1 $之外。为了精确地描述这些极端资源的喷气性能的目的，我们开始了一项多波长的运动，以结合Nustar，Swift和Sara的观测来跟进他们。我们观察到六个高红色的类星体，其中四个属于新的$γ$ ray-ray sumive mev blazars。彻底的X射线分析揭示了其中三个对象在软X射线时的光谱平坦。源NVSS J151002 $+$ 570243还显示了在Energies $ e> 6 \，\ rm kev $的X射线频谱的特殊重新标记。采用单区Leptonic发射模型，这种硬X射线和$γ$ - 砂的组合使我们能够确定compton峰峰的位置，并准确地限制喷射特性。在喷射磁盘连接的背景下，我们发现所有六个来源都具有超过积聚磁盘发光度的喷气功率，似乎甚至超过$ z> 3 $都验证了这种正相关。我们发现我们的六个来源具有$ 10^9 \ rm m _ {\ odot} $黑洞，进一步提高了红移bin $ z = [3,4] $中超大黑洞的空间密度。
With bolometric luminosities exceeding $10^{48}$ erg s$^{-1}$, powerful jets and supermassive black holes at their center, MeV blazars are some of the most extreme sources in the Universe. Recently, the Fermi-Large Area Telescope detected five new $γ$-ray emitting MeV blazars beyond redshift $z=3.1$. With the goal of precisely characterizing the jet properties of these extreme sources, we started a multiwavelength campaign to follow them up with joint NuSTAR, Swift and SARA observations. We observe six high-redshift quasars, four of them belonging to the new $γ$-ray emitting MeV blazars. Thorough X-ray analysis reveals spectral flattening at soft X-ray for three of these objects. The source NVSS J151002$+$570243 also shows a peculiar re-hardening of the X-ray spectrum at energies $E>6\,\rm keV$. Adopting a one-zone leptonic emission model, this combination of hard X-rays and $γ$-rays enables us to determine the location of the Inverse Compton peak and to accurately constrain the jet characteristics. In the context of the jet-accretion disk connection, we find that all six sources have jet powers exceeding accretion disk luminosity, seemingly validating this positive correlation even beyond $z>3$. Our six sources are found to have $10^9 \rm M_{\odot}$ black holes, further raising the space density of supermassive black holes in the redshift bin $z=[3,4]$.
