Exploring the radio-loudness of SDSS quasars with spectral stacking
Exploring the radio-loudness of SDSS quasars with spectral stacking
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利用频谱叠加探索 SDSS 类星体的射电响度
DOI：
10.1093/mnras/stae233
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发表时间：
2024
影响因子：
4.8
通讯作者：
Arnaudova M
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作者：
Arnaudova M
我们使用LOFAR（低频阵列）两米巡天（LoTSS）在5634 deg 2以上的新144 MHz观测结果，从斯隆数字巡天（SDSS-DR 14）的第14次数据发布中收集了最大的均匀选择的光谱确认类星体样本。使用无线电响度的经典定义，R= log（L1.4GHz/Li），我们在0.6 <z< 3.4处识别了3697个无线电大声（RL）和111132个无线电安静（RQ）源。为了研究它们的特性，我们开发了一种新的静止帧光谱叠加算法，设计与即将到来的大规模多路复用光谱调查铭记，并使用它来创建高信噪比的复合光谱的每一类，匹配的红移和绝对波段的幅度。我们发现RL类星体比RQ类星体具有更红的连续谱和更强的[Oii]辐射。这些结果仍然存在时，额外匹配的黑洞质量，这表明这个参数是不是在使一个类恒星物体（QSO）RL的定义因素。我们发现，这些功能是不是逐渐变化的无线电响度的函数，但保持即使在更深入地探讨RQ人口，表明一个明确的划分无线电响度是不明显的。在研究由[Oii]发射线推断的星星形成率（SFR）时，用[Nev]线去除活动星系核的贡献，我们发现RL类星体的星星形成率相对于RQ类星体至少要高出1.9倍。鉴于我们的研究结果，我们建议RL源要么最好驻留在富含气体的系统与快速旋转的黑洞，或代表一个早期的模糊阶段的类星体演化。
We use new 144 MHz observations over 5634 deg2from the LOFAR (Low Frequency Array) Two-metre Sky Survey (LoTSS) to compile the largest sample of uniformly selected, spectroscopically confirmed quasars from the 14th data release of the Sloan Digital Sky Survey (SDSS-DR14). Using the classical definition of radio loudness,R= log (L1.4GHz/Li), we identify 3697 radio-loud (RL) and 111 132 radio-quiet (RQ) sources at 0.6 <z< 3.4. To study their properties, we develop a new rest-frame spectral stacking algorithm, designed with forthcoming massively multiplexed spectroscopic surveys in mind, and use it to create high signal-to-noise composite spectra of each class, matched in redshift and absolutei-band magnitude. We show that RL quasars have redder continuum and enhanced [Oii] emission than their RQ counterparts. These results persist when additionally matching in black hole mass, suggesting that this parameter is not the defining factor in making a quasi-stellar object (QSO) RL. We find that these features are not gradually varying as a function of radio loudness, but are maintained even when probing deeper into the RQ population, indicating that a clear-cut division in radio loudness is not apparent. Upon examining the star formation rates (SFRs) inferred from the [Oii] emission line, with the contribution from active galactic nucleus removed using the [Nev] line, we find that RL quasars have a significant excess of star formation relative to RQ quasars out toz= 1.9 at least. Given our findings, we suggest that RL sources either preferably reside in gas-rich systems with rapidly spinning black holes, or represent an earlier obscured phase of QSO evolution.
影响因子：
4.8
作者：
C. Macfarlane;P. Best;J. Sabater;G. Gürkan;M. Jarvis;H. Röttgering;R. D. Baldi;G. Calistro Rivera-G.-Calistro Rive
通讯作者：
C. Macfarlane;P. Best;J. Sabater;G. Gürkan;M. Jarvis;H. Röttgering;R. D. Baldi;G. Calistro Rivera-G.-Calistro Rive
“与组方案相关的角色产品和平衡集”（预印本）。
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