Galaxy zoo: stronger bars facilitate quenching in star-forming galaxies
Galaxy zoo: stronger bars facilitate quenching in star-forming galaxies
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DOI：
10.1093/mnras/stab2064
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发表时间：
2021-07
影响因子：
4.8
通讯作者：
T. Géron;R. Smethurst;C. Lintott;S. Kruk;K. Masters;B. Simmons;D. Stark
中科院分区：
文献类型：
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作者：
T. Géron;R. Smethurst;C. Lintott;S. Kruk;K. Masters;B. Simmons;D. Stark
我们已经使用银河动物园贴花(GZD)来研究盘状星系中的强条和弱条。在广州天文台的31.4万个星系中，我们创建了一个体积有限的样本(0.01lt；z<；0.05，mr<；−18.96)，其中包含1,867个星系，在紫花苜蓿足迹中有可靠的志愿者条形分类。与之前的银河动物园调查(如GZ2)保持一致，GZD的形态分类与之前的形态调查一致。GZD认为星系要么有强条(15.5%)，要么有弱条(28.1%)，要么没有条(56.4%)，这是根据志愿者对从贴花调查获得的图像进行的分类。这使得GZD在评估强弱棒材之间的差异方面处于独特的地位。我们发现，在静止星系中，强棒分数通常比恒星形成星系中的高，而弱棒分数则相似。此外，我们还发现，强棒促进了恒星形成星系中的猝灭过程，与未阻挡星系相比，在这些星系中发现了更高的纤维恒星形成率(SFR)，更低的气体质量，以及更短的耗尽时间尺度。然而，我们也发现，当控制棒的长度时，强棒和弱棒之间的任何差异都消失了。基于此，我们得出结论，弱棒和强棒并不是本质上的不同现象。相反，我们认为存在一个从最弱到最强的杆类型的连续体。
We have used Galaxy Zoo DECaLS (GZD) to study strong and weak bars in disc galaxies. Out of the 314 000 galaxies in GZD, we created a volume-limited sample (0.01 < z < 0.05, Mr < − 18.96) which contains 1867 galaxies with reliable volunteer bar classifications in the ALFALFA footprint. In keeping with previous Galaxy Zoo surveys (such as GZ2), the morphological classifications from GZD agree well with previous morphological surveys. GZD considers galaxies to either have a strong bar (15.5 per cent), a weak bar (28.1 per cent) or no bar (56.4 per cent), based on volunteer classifications on images obtained from the DECaLS survey. This places GZD in a unique position to assess differences between strong and weak bars. We find that the strong bar fraction is typically higher in quiescent galaxies than in star-forming galaxies, while the weak bar fraction is similar. Moreover, we have found that strong bars facilitate the quenching process in star-forming galaxies, finding higher fibre star formation rates (SFRs), lower gas masses, and shorter depletion time-scales in these galaxies compared to unbarred galaxies. However, we also found that any differences between strong and weak bars disappear when controlling for bar length. Based on this, we conclude that weak and strong bars are not fundamentally different phenomena. Instead, we propose that there is a continuum of bar types, which varies from ‘weakest’ to ‘strongest’.