论文标题
带有Z \ leq 1的无线电agn的星系形状
Shapes of galaxies hosting radio-loud AGNs with z \leq 1
论文作者
论文摘要
Radio Loud活跃的银河核（RLAGNS）的性质与宿主的形态之间的联系可能为我们理解如何触发Rlagns提供重要的线索。在这项工作中，专注于被动星系，我们研究了从Karl G. Jansky选择的RLAGNS宿主的形状，非常大的阵列宇宙进化调查（VLA-COSMOS）3GHz大型项目，并将它们与以前的结果相比，基于先前的结果，基于第一个数据释放（DR1）的第一个数据释放（DR1）。我们发现，在0.6至1之间的红移（$ l_ {1.4 GHz} \ gtrsim10^{24} \ rm w hz^{ - 1} $）rlagns的光射轴比较低的散射式对手均高出的鸟类均高。我们构建控制样品并表明，尽管与非lagns相比，具有最高光度的高红移RLAGN的宿主仍然具有较圆形的形状，但它们的平均轴比（比本地rlagns都较小（更细长），而其本地rlagns具有相似的恒星质量和无线电量。这种进化可以解释为无线电亮度演化的副产品，即固定恒星质量的星系在高红移时更加可发光：人为地提高局部星系的无线电亮度（$ z \ leq $ 0.3）（$ z \ leq $ 0.3），可以消除观察到的轴比率分布的轴变化。如果这种解释是正确的，那么这意味着AGN无线电光度与主机星系形状之间的链接在$ z \ simeq1 $与当今的宇宙中相似。
Links between the properties of radio-loud active galactic nuclei (RLAGNs) and the morphology of their hosts may provide important clues for our understanding of how RLAGNs are triggered. In this work, focusing on passive galaxies, we study the shape of the hosts of RLAGNs selected from the Karl G. Jansky Very Large Array Cosmic Evolution Survey (VLA-COSMOS) 3GHz Large Project, and compare them with previous results based on the first data release (DR1) of the LOFAR Two-Metre Sky Survey (LoTSS). We find that, at redshifts of between 0.6 and 1, high-luminosity ($L_{1.4 GHz}\gtrsim10^{24}\rm W Hz^{-1}$) RLAGNs have a wider range of optical projected axis ratios than their low-redshift counterparts, which are essentially all found in round galaxies with axis ratios of higher than 0.7. We construct control samples and show that although the hosts of high-redshift RLAGNs with the highest luminosities still have a rounder shape compared with the non-RLAGNs, they on average have a smaller axis ratio (more elongated) than the local RLAGNs with similar stellar masses and radio luminosities. This evolution can be interpreted as a byproduct of radio luminosity evolution, namely that galaxies at fixed stellar mass are more radio luminous at high redshifts: artificially increasing the radio luminosities of local galaxies ($z\leq$0.3) by a factor of 2 to 4 can remove the observed evolution of the axis ratio distribution. If this interpretation is correct then the implication is that the link between AGN radio luminosity and host galaxy shape is similar at $z\simeq1$ to in the present-day Universe.
