论文标题
AGN和矮人星系气体运动学
AGN and Dwarf Galaxy Gas Kinematics
论文作者
论文摘要
我们介绍了恒星质量星系的恒星和离子气体成分的空间分辨运动测量值$ 10^{8.5} -10^{10} {10} M _ {\ odot} $，从SDSS DR7和DR8中选择，然后使用Keck/Lris Spectrscopy。我们通过比较含有AGN的26个星系的旋转曲线以及没有AGN的光学或红外迹象的19个对照星系的旋转曲线来研究活性银河核（AGN）对星系范围内气体运动学的潜在影响。我们发现AGN活性与宿主星系中的气体运动学受到干扰之间存在密切的关联。尽管该样品中的星形形成星系往往具有与恒星共旋转的有序气盘，但73 \％的AGN却干扰了气体。我们发现45个星系中有5个具有与恒星相反旋转的气态成分，并且所有表现出反旋转的星系都包含AGN。七个孤立星系中有六个具有干扰的电离气体寄主AGN。至少三个AGN明显低于恒星质量的质量关系，这可以解释为持续的恒星形成抑制的证据。综上所述，这些结果提供了支持AGN影响气体运动学并抑制矮星系中恒星形成的能力的新证据。这进一步证明了将AGN作为低质量制度中星系形成模型中的反馈机制的重要性。
We present spatially resolved kinematic measurements of stellar and ionized gas components of dwarf galaxies in the stellar mass range $10^{8.5} - 10^{10} M_{\odot}$, selected from SDSS DR7 and DR8 and followed-up with Keck/LRIS spectroscopy. We study the potential effects of active galactic nuclei (AGN) on galaxy-wide gas kinematics by comparing rotation curves of 26 galaxies containing AGN, and 19 control galaxies with no optical or infrared signs of AGN. We find a strong association between AGN activity and disturbed gas kinematics in the host galaxies. While star forming galaxies in this sample tend to have orderly gas discs that co-rotate with the stars, 73\% of the AGN have disturbed gas. We find five out of 45 galaxies have gaseous components in counter-rotation with their stars, and all galaxies exhibiting counter-rotation contain AGN. Six out of seven isolated galaxies with disturbed ionized gas host AGN. At least three AGN fall clearly below the stellar-halo mass relation, which could be interpreted as evidence for ongoing star formation suppression. Taken together, these results provide new evidence supporting the ability of AGN to influence gas kinematics and suppress star formation in dwarf galaxies. This further demonstrates the importance of including AGN as a feedback mechanism in galaxy formation models in the low-mass regime.
