LeMMINGs。I.附近星系的eMERLIN遗产调查。1.5-GHz秒差距级无线电结构和核心
LeMMINGs. I. The eMERLIN legacy survey of nearby galaxies. 1.5-GHz parsec-scale radio structures and cores
摘要：
我们提出的第一个数据发布的高分辨率（$\leq0.2$ arcsec）1.5 GHz的射电图像的103个附近的星系从帕洛玛样本，观察与eMERLIN阵列，作为LeMMINGS调查的一部分。这个样本包括活跃星系（LINER和Seyfert）和静止星系（HII星系和吸收线星系，ALG），它们是根据修订的发射线图重新分类的。我们探测到47/103个星系（LINERS星系22/34，Seyferts星系4/4，HII星系16/51，ALG星系5/14）的射电发射$\gtrsim$ 0.2 mJy，其射电大小通常为$\lesssim$ 100 pc。我们确定了41个源的无线电结构内的无线电核心位置。一半的样品显示喷射形态。剩下的一半显示单一的无线电核心或复杂的形态。LINER比Seyfers显示了更多的核心明亮的射电结构。样品的射电光度范围为10 $^{32}$ ~ 10 $^{40}$ erg s $^{-1}$：LINER和HII星系的射电功率分别最高和最低，ALG和Seyferts的射电功率居中。我们发现，无线电核心光度与黑洞（BH）的质量下降到$\sim$ 10 $^{7}$ M $_{\odot}$，但在较低的质量出现一个突破。使用[O III]线光度作为吸积光度的代理，活动核和喷流HII星系遵循BH活动的光学基本平面，这表明一个共同的盘喷关系。总之，LINER核是FR I射电星系的缩小版本; Seyferts显示出较少的准直喷流; HII星系可能拥有弱活性BH和/或核恒星形成核心;和经常性BH活动可能占ALG属性。
英文摘要：
We present the first data release of high-resolution ($\leq0.2$ arcsec) 1.5-GHz radio images of 103 nearby galaxies from the Palomar sample, observed with the eMERLIN array, as part of the LeMMINGs survey. This sample includes galaxies which are active (LINER and Seyfert) and quiescent (HII galaxies and Absorption line galaxies, ALG), which are reclassified based upon revised emission-line diagrams. We detect radio emission $\gtrsim$ 0.2 mJy for 47/103 galaxies (22/34 for LINERS, 4/4 for Seyferts, 16/51 for HII galaxies and 5/14 for ALGs) with radio sizes typically of $\lesssim$100 pc. We identify the radio core position within the radio structures for 41 sources. Half of the sample shows jetted morphologies. The remaining half shows single radio cores or complex morphologies. LINERs show radio structures more core-brightened than Seyferts. Radio luminosities of the sample range from 10$^{32}$ to 10$^{40}$ erg s$^{-1}$: LINERs and HII galaxies show the highest and the lowest radio powers respectively, while ALGs and Seyferts have intermediate luminosities. We find that radio core luminosities correlate with black hole (BH) mass down to $\sim$10$^{7}$ M$_{\odot}$, but a break emerges at lower masses. Using [O III] line luminosity as a proxy for the accretion luminosity, active nuclei and jetted HII galaxies follow an optical fundamental plane of BH activity, suggesting a common disc-jet relationship. In conclusion, LINER nuclei are the scaled-down version of FR I radio galaxies; Seyferts show less collimated jets; HII galaxies may host weak active BHs and/or nuclear star-forming cores; and recurrent BH activity may account for ALG properties.
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