窄线赛弗特1星系与宽线赛弗特1星系的射电特性
Radio Properties of Narrow-Line and Broad-Line Seyfert 1 Galaxies
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中文总结 AI 辅助
该研究对比大样本窄线赛弗特1与宽线赛弗特1星系的射电特性，发现窄线赛弗特1星系的射电探测率、射电噪度等射电相关参数更低，且超半数探测到的两类星系含射电活动星系核。
中文摘要 AI 辅助
窄线赛弗特1（NLS1）星系拥有活动星系核（AGN），其宽线区的光学发射线较窄，这通常可由中心超大质量黑洞质量相对较低以及爱丁顿极限以上的吸积来解释。我们对比了从斯隆数字巡天中汇编的大样本NLS1星系与宽线赛弗特1（BLS1）星系的射电特性，将NLS1和BLS1样本与1.4 GHz的20厘米射电 faint图像（FIRST）巡天，以及3 GHz的甚大天线阵天空巡天（VLASS）第一、二历元数据进行交叉匹配，计算了射电谱指数、1.4 GHz射电功率和射电噪度。我们发现NLS1星系的1.4 GHz射电探测率更低，其样本的中位射电噪度、射电噪AGN占比和中位1.4 GHz射电功率也均低于BLS1样本；中位谱指数表明，NLS1样本的射电谱比BLS1样本略陡。对从射电数据和广域红外巡天探测器卫星的红外观测推算出的恒星形成率的对比显示，超过半数被FIRST和VLASS探测到的NLS1与BLS1星系包含发射射电的AGN。
英文摘要
Narrow-line Seyfert 1 (NLS1) galaxies host active galactic nuclei (AGN) with narrow optical emission lines of the broad-line region. This is often explained with a relatively lower mass of the central supermassive black hole and super-Eddington accretion. We compared the radio properties of large samples of NLS1 and broad-line Seyfert 1 (BLS1) galaxies compiled from the Sloan Digital Sky Survey. We cross-matched the NLS1 and BLS1 samples with the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) sky survey at 1.4 GHz and the first and second epoch data of the Very Large Array Sky Survey (VLASS) at 3 GHz. We calculated the radio spectral indices, the 1.4-GHz radio power, and the radio loudness. We found lower 1.4-GHz radio detection rates for the NLS1 galaxies. The median radio loudness values, the fraction of radio-loud AGN, and the median 1.4-GHz radio power are also lower for the NLS1 sample. The median spectral indices imply a slightly steeper radio spectrum for the NLS1 sample than for the BLS1 sample. Comparison of the star formation rates estimated from the radio data and the infrared measurements of the Wide-field Infrared Survey Explorer satellite indicated that more than half of the FIRST- and VLASS-detected NLS1 and BLS1 galaxies contain radio-emitting AGN.
