Radio-Loud narrow-line Seyfert 1 galaxies (NLS1s), especially the extremely radio-loud ones, are widely accepted as the jetted versions of NLS1s. We explore the radio-loud fraction for NLS1s with recently released LoTSS DR1 at 150 MHz. The radio detection rate is about 28% for LoTSS DR1. The radio detected NLS1s have lower redshift than the non-detected ones. Moreover, the 150 MHz radio luminosities of NLS1s detected by LoTSS are about two orders of magnitude weaker than those of the previous samples. By defining the radio loudness with the ratio between 150 MHz radio flux and SDSS r band flux, the radio-loud fraction is about 1% with the critical radio loudness equalling 100. Radio loudness shows no dependence on central black hole mass, while weak correlations are found between radio loudness and disk luminosity, as well as Eddington ratio.

中文翻译：

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用LoTSS DR1重新探讨放射线窄线赛弗1星系的分数

无线电辐射的窄线塞弗1号星系（NLS1s），尤其是无线电辐射极强的星系，被广泛接受为NLS1的喷射型。我们使用150 MHz的最新发布的LoTSS DR1探索NLS1的无线电响分数。LoTSS DR1的无线电检测率约为28％。无线电检测到的NLS1的红移比未检测到的低。此外，LoTSS检测到的NLS1的150 MHz无线电发光度比以前的样本弱了大约两个数量级。通过用150 MHz无线电通量和SDSS r之比定义无线电响度 在带通量的情况下，无线电响度分数约为1％，临界无线电响度等于100。无线电响度与中心黑洞质量无关，而无线电响度与磁盘光度以及爱丁顿比率之间的相关性较弱。