标题： 一个在 z = 2.99 的显著可变、明亮的 2 型类星体，具有一个巨大的寄主星系 显示英文标题

标题： An X-ray Significantly Variable, Luminous, Type 2 Quasar at z = 2.99 with a Massive Host Galaxy

摘要： 我们对WISEA J171419.96+602724.6进行了全面的X射线分析和光谱能量分布（SED）拟合，这是一颗红移$z$ = 2.99的极其明亮的2型类星体。该源曾被2011年的短时长XMM-Newton观测建议为候选的康普顿厚（柱密度N$_{\rm H}>$1.5 $\times$ 10$^{24}$ cm$^{-2}$）类星体。 我们最近于2021年使用深场 NuSTAR 和 XMM-Newton 观测了这个源，并发现该源的吸收柱密度为 N$_{\rm H}\sim$5 $\times$ 10$^{22}$ cm$^{-2}$，其流量大约低四倍。两次观测时期表明，该源在不到 2.5 年的时间内（在源的静止参照系中），在 2-3~$\sigma$范围内的 X 射线吸收、流量和固有光度表现出显著变化。由于多波段数据（从硬 X 射线到无线电）的极大可用性，我们利用 CIGALE 对该源进行了 SED 拟合。 该源非常明亮，总光度为$L_{\rm BOL}\sim$ 2.5 $\times$ 10$^{47}$ 尔格/秒$^{-1}$。 Its host galaxy has a huge star formation rate (SFR) of $\sim$1280 Solar mass yr$^{-1}$ and a huge stellar mass of $\sim$1.1 $\times$ 10$^{12}$ Solar mass. The correlation between the SFR and stellar mass of this source is consistent with what was measured in the high-$z$ quasars. It is also consistent with what was measured in the main-sequence star-forming galaxies, suggesting that the presence of the active nucleus in our target does not enhance or suppress the SFR of its host galaxy. The source is an Infrared hyper-luminous, obscured galaxy with significant amount of hot dust in its torus and shares many similar properties with hot, dust obscured galaxies. 显示英文摘要

摘要： We present a comprehensive X-ray analysis and spectral energy distribution (SED) fitting of WISEA J171419.96+602724.6, an extremely luminous type 2 quasar at $z$ = 2.99. The source was suggested as a candidate Compton-thick (column density N$_{\rm H}>$1.5 $\times$ 10$^{24}$ cm$^{-2}$) quasar by a short XMM-Newton observation in 2011. We recently observed the source with deep NuSTAR and XMM-Newton exposures in 2021 and found that the source has a lower obscuration of N$_{\rm H}\sim$5 $\times$ 10$^{22}$ cm$^{-2}$ with an about four times lower flux. The two epochs of observations suggested that the source was significantly variable in X-ray obscuration, flux, and intrinsic luminosity at 2-3~$\sigma$ in less than 2.5 years (in the source rest frame). We performed SED fitting of this source using CIGALE thanks to its great availability of multiwavelength data (from hard X-rays to radio). The source is very luminous with a bolometric luminosity of $L_{\rm BOL}\sim$ 2.5 $\times$ 10$^{47}$ erg s$^{-1}$. Its host galaxy has a huge star formation rate (SFR) of $\sim$1280 Solar mass yr$^{-1}$ and a huge stellar mass of $\sim$1.1 $\times$ 10$^{12}$ Solar mass. The correlation between the SFR and stellar mass of this source is consistent with what was measured in the high-$z$ quasars. It is also consistent with what was measured in the main-sequence star-forming galaxies, suggesting that the presence of the active nucleus in our target does not enhance or suppress the SFR of its host galaxy. The source is an Infrared hyper-luminous, obscured galaxy with significant amount of hot dust in its torus and shares many similar properties with hot, dust obscured galaxies.