LeMMINGs - I. The eMERLIN legacy survey of nearby galaxies. 1.5-GHz parsec-scale radio structures and cores
LeMMINGs - I. The eMERLIN legacy survey of nearby galaxies. 1.5-GHz parsec-scale radio structures and cores
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DOI：
10.1093/mnras/sty342
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发表时间：
2018-02
影响因子：
4.8
通讯作者：
R. D. Baldi;D. Williams;I. McHardy;R. Beswick;M. Argo;M. Argo;B. T. Dullo;J. Knapen;J. Knapen;E. Brinks;T. Muxlow;S. Aalto;A. Alberdi;G. Bendo;S. Corbel;S. Corbel;R. Evans;D. Fenech;D. Green;H. Klöckner;E. Körding;P. Kharb;T. Maccarone;I. Martí-Vidal;C. Mundell;F. Panessa;A. Peck;M. Pérez-Torres;D. Saikia;P. Saikia;P. Saikia;F. Shankar;R. Spencer;I. Stevens;P. Uttley;J. Westcott
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文献类型：
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作者：
R. D. Baldi;D. Williams;I. McHardy;R. Beswick;M. Argo;M. Argo;B. T. Dullo;J. Knapen;J. Knapen;E. Brinks;T. Muxlow;S. Aalto;A. Alberdi;G. Bendo;S. Corbel;S. Corbel;R. Evans;D. Fenech;D. Green;H. Klöckner;E. Körding;P. Kharb;T. Maccarone;I. Martí-Vidal;C. Mundell;F. Panessa;A. Peck;M. Pérez-Torres;D. Saikia;P. Saikia;P. Saikia;F. Shankar;R. Spencer;I. Stevens;P. Uttley;J. Westcott
作为 LeMMINGs 调查的一部分，我们首次发布了来自 Palomar 样本的 103 个附近星系的高分辨率（≤0.2 弧秒）1.5 GHz 射电图像，这些图像是使用 eMERLIN 阵列观测到的。该样本包括活动星系（低电离核发射线区域 [LINER] 和 Seyfert）和静止星系（H ii 星系和吸收线星系，ALG），它们根据修订的发射线图重新分类。我们检测到 47/103 个星系的射电发射 ≳0.2 mJy（LINERS 为 22/34，Seyferts 为 4/4，H ii 星系为 16/51，ALG 为 5/14），射电尺寸通常为 ≲100 个。我们确定了 41 个源的无线电结构中的无线电核心位置。一半的样品显示出喷射形态。剩下的一半显示单个无线电核心或复杂的形态。 LINER 显示出比 Seyferts 更核心的无线电结构。样本的射电光度范围为 1032 至 1040 erg s−1：LINER 星系和 H ii 星系分别显示出最高和最低的射电功率，而 ALG 和 Seyferts 则具有中等光度。我们发现射电核心光度与低至 ~107 M⊙ 的黑洞 (BH) 质量相关，但在较低质量时出现断裂。使用 [O iii] 线光度作为吸积光度的代表，活动核和喷流 H ii 星系遵循 BH 活动的光学基本平面，表明存在常见的盘-喷流关系。总之，LINER 核是 FR I 射电星系的缩小版； Seyferts 显示较少的准直射流； H ii 星系可能拥有弱活跃的 BH 和/或恒星形成核；经常性的 BH 活动可能是 ALG 特性的原因。
We present the first data release of high-resolution (≤0.2 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 (low-ionization nuclear emission-line regions [LINER] and Seyfert) and quiescent (H ii galaxies and absorption line galaxies, ALGs), which are reclassified based upon revised emission-line diagrams. We detect radio emission ≳0.2 mJy for 47/103 galaxies (22/34 for LINERS, 4/4 for Seyferts, 16/51 for H ii galaxies, and 5/14 for ALGs) with radio sizes typically of ≲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 1032 to 1040 erg s−1: LINERs and H ii galaxies show the highest and 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 ∼107 M⊙, but a break emerges at lower masses. Using [O iii] line luminosity as a proxy for the accretion luminosity, active nuclei and jetted H ii 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; H ii galaxies may host weak active BHs and/or nuclear star-forming cores; and recurrent BH activity may account for ALG properties.