XMM and NuSTAR Observations of an Optically Quiescent Quasar
XMM and NuSTAR Observations of an Optically Quiescent Quasar
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DOI：
10.3847/2041-8213/ac83a0
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
C. Greenwell;P. Gandhi;G. Lansbury;P. Boorman;V. Mainieri;D. Stern
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作者：
C. Greenwell;P. Gandhi;G. Lansbury;P. Boorman;V. Mainieri;D. Stern
光学静止类星体（OQQQ）是一类最近系统化的具有类星系光学连续统的红外发光活动星系核（AGN）。它们可能代表活动星系核生命周期中一个有趣的、短暂的阶段，例如，要么是被高覆盖率的媒体所包围，要么是最近触发的迹象，但其性质仍不清楚。在这里，我们提出了第一个有针对性的同时X射线观测的OQQ，我们以前确定的原型，SDSS J075139.06+402811.2在z = 0.587。用XMM-牛顿和努斯塔在0.5-16千电子伏的范围内显著地探测到该源，明确地证实了当前吸积活动的存在。光谱模型计算出的内禀光度L 2-10 keV <$4.4 × 1043 erg s−1，完全在活动星系核的范围内，但相对于其红外功率而言，亮度不足。它是轻微模糊的，log N H [cm−2]<$22。
Optically quiescent quasars (OQQs) represent a recently systematized class of infrared-luminous active galactic nuclei (AGNs) that have galaxy-like optical continua. They may represent an interesting, brief phase in the AGN life cycle, e.g., either cocooned within high-covering-factor media or indicative of recent triggering, though their nature remains unclear. Here, we present the first targeted simultaneous X-ray observations of an OQQ, our previously identified prototype, SDSS J075139.06+402811.2 at z = 0.587. The source is significantly detected over 0.5–16 keV with XMM-Newton and NuSTAR, unambiguously confirming the presence of current accretion activity. Spectral modeling yields an intrinsic luminosity L 2–10 keV ≈ 4.4 × 1043 erg s−1, well within the AGN regime, but underluminous relative to its infrared power. It is lightly obscured, with log N H [cm−2] ≈ 22.