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arXiv 1906.00643astro-ph.GA
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SDSS-IV MaNGA:横隔星系内的恒星星族天体

SDSS-IV MaNGA: Stellar Population Gradients Within Barred Galaxies

Amelia Fraser-McKelvie, Michael Merrifield, Alfonso Aragón-Salamanca, Thomas Peterken, Karen Masters, Coleman Krawczyk, Brett Andrews, Johan H. Knapen, Sandor K… 展开作者

Amelia Fraser-McKelvie, Michael Merrifield, Alfonso Aragón-Salamanca, Thomas Peterken, Karen Masters, Coleman Krawczyk, Brett Andrews, Johan H. Knapen, Sandor Kruk, Adam Schaefer, Rebecca Smethurst, Rogério Riffel, Joel Brownstein, Niv Drory

摘要:

星系中的棒被认为刺激了物质的流入和沿着它们的径向混合。然而,迄今为止,这种混合的观测证据还没有定论,限制了对酒吧对星系演化影响的评估。我们现在使用的结果从MaNGA积分场光谱调查,沿酒吧和酒吧外的128个强棒星系的径向恒星年龄和金属丰度梯度。我们发现,年龄和金属丰度梯度是平坦的,在几乎所有的棒星系的棒区域相比,在相同的半径相应的磁盘区域。我们的研究结果再次强调了一个关键的事实,即通过方位平均积分场光谱数据失去了重要的信息,从非轴对称星系的组成部分,如酒吧和螺旋臂。我们解释我们的结果作为观测证据,酒吧径向混合材料在星系中的所有恒星质量,并为所有酒吧的形态和演化阶段。

英文摘要:

Bars in galaxies are thought to stimulate both inflow of material and radial mixing along them. Observational evidence for this mixing has been inconclusive so far however, limiting the evaluation of the impact of bars on galaxy evolution. We now use results from the MaNGA integral field spectroscopic survey to characterise radial stellar age and metallicity gradients along the bar and outside the bar in 128 strongly barred galaxies. We find that age and metallicity gradients are flatter in the barred regions of almost all barred galaxies when compared to corresponding disk regions at the same radii. Our results re-emphasize the key fact that by azimuthally averaging integral field spectroscopic data one loses important information from non-axisymmetric galaxy components such as bars and spiral arms. We interpret our results as observational evidence that bars are radially mixing material in galaxies of all stellar masses, and for all bar morphologies and evolutionary stages.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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