Galaxy Zoo: kinematics of strongly and weakly barred galaxies
Galaxy Zoo: kinematics of strongly and weakly barred galaxies
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星系动物园：强和弱棒星系的运动学
DOI：
10.1093/mnras/stad501
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发表时间：
2023
影响因子：
4.8
通讯作者：
Drory, Niv
中科院分区：
文献类型：
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作者：
Géron, Tobias;Smethurst, Rebecca J;Lintott, Chris;Kruk, Sandor;Masters, Karen L;Simmons, Brooke;Mantha, Kameswara Bharadwaj;Walmsley, Mike;Garma-Oehmichen, L;Drory, Niv
利用MaNGA的积分场单位数据和Tüsse-Weinberg方法，研究了225个棒星系的棒斑图速度和共转半径。我们的样本，这是通过银河动物园确定的强和弱棒星系之间的划分，是最大的，这种方法已经应用。我们发现较低的模式速度强棒星系比弱棒星系。由于模拟显示，当棒与其宿主交换角动量时，图案速度降低，这些结果表明，强棒比弱棒更进化。有趣的是，弱棒星系和强棒星系的共转半径并没有不同，尽管它们与棒的长度成正比。我们还发现，共转半径显着不同的淬火和恒星形成的星系。此外，我们发现，强棒星系有显着较低的值，共转半径和酒吧半径之间的比率，比弱棒星系，尽管在这两个分布有很大的重叠。这个比率将酒吧分为超快酒吧（1.0;我们样本的11%），快速酒吧（1.01.4; 27%）和慢速酒吧（1.4; 62%）。模拟表明这与酒吧的形成机制相关，因此我们的结果表明强酒吧比弱酒吧更有可能由不同的机制形成。最后，我们发现了比大多数其他研究更低比例的超快棒，这降低了最近声称的与Lambda冷暗物质的张力。然而，的中值仍然低于模拟预测的值。
We study the bar pattern speeds and corotation radii of 225 barred galaxies, using integral field unit data from MaNGA and the Tremaine–Weinberg method. Our sample, which is divided between strongly and weakly barred galaxies identified via Galaxy Zoo, is the largest that this method has been applied to. We find lower pattern speeds for strongly barred galaxies than for weakly barred galaxies. As simulations show that the pattern speed decreases as the bar exchanges angular momentum with its host, these results suggest that strong bars are more evolved than weak bars. Interestingly, the corotation radius is not different between weakly and strongly barred galaxies, despite being proportional to bar length. We also find that the corotation radius is significantly different between quenching and star-forming galaxies. Additionally, we find that strongly barred galaxies have significantly lower values for, the ratio between the corotation radius and the bar radius, than weakly barred galaxies, despite a big overlap in both distributions. This ratio classifies bars into ultrafast bars (1.0; 11 per cent of our sample), fast bars (1.01.4; 27 per cent), and slow bars (1.4; 62 per cent). Simulations show thatis correlated with the bar formation mechanism, so our results suggest that strong bars are more likely to be formed by different mechanisms than weak bars. Finally, we find a lower fraction of ultrafast bars than most other studies, which decreases the recently claimed tension with Lambda cold dark matter. However, the median value ofis still lower than what is predicted by simulations.