论文标题
隔离活跃螺旋星系的光盘中的$λ_r$比其非活动双胞胎
Larger $λ_R$ in the disc of isolated active spiral galaxies than in their non-active twins
论文作者
论文摘要
我们提出了一个自旋参数$λ_R$的比较，该$λ_r$以由星系盘主导的区域测量，在附近的20对（0.005 $ <$ <$ <$ <$ <$ <0.03）之间，看似孤立的双胞胎星系在核活动方面有所不同。我们发现，80--82％的活动星系显示出比其相应的非活动双胞胎的$λ_r$更高的值，这表明AGN盘中的旋转支持更大。该结果是由11对未挂牌星系驱动的，为此，AGN的100％显示出比双胞胎大的$λ_r$。这些结果可以通过在活动星系的情况下从流入气体到圆盘重症机物质的更有效的角动量转移来解释。这种气体流入本可以是由光盘或棒不稳定性引起的，尽管如果我们在活跃的星系中普遍存在，我们不能排除次要合并。该结果代表了中间恒星质量的活性和非活动隔离螺旋星系之间的星系尺度差异的第一个证据（10 $^{10} <m _*<10^{11}} $ m $ _ {\ odot} $）在本地宇宙中。
We present a comparison of the spin parameter $λ_R$, measured in a region dominated by the galaxy disc, between 20 pairs of nearby (0.005$<$z$<$0.03) seemingly isolated twin galaxies differing in nuclear activity. We find that 80--82% of the active galaxies show higher values of $λ_R$ than their corresponding non-active twin(s), indicating larger rotational support in the AGN discs. This result is driven by the 11 pairs of unbarred galaxies, for which 100% of the AGN show larger $λ_R$ than their twins. These results can be explained by a more efficient angular momentum transfer from the inflowing gas to the disc baryonic matter in the case of the active galaxies. This gas inflow could have been induced by disc or bar instabilities, although we cannot rule out minor mergers if these are prevalent in our active galaxies. This result represents the first evidence of galaxy-scale differences between the dynamics of active and non-active isolated spiral galaxies of intermediate stellar masses (10$^{10}<M_*<10^{11}$ M$_{\odot}$) in the Local Universe.
