Stellar masses of clumps in gas-rich, turbulent disc galaxies
Stellar masses of clumps in gas-rich, turbulent disc galaxies
复制标题
富含气体的湍流盘星系中的恒星团块
DOI：
10.1093/mnras/stac622
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发表时间：
2022
影响因子：
4.8
通讯作者：
Damjanov, Ivana
中科院分区：
文献类型：
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作者：
Ambachew, Liyualem;Fisher, Deanne B;Glazebrook, Karl;Girard, Marianne;Obreschkow, Danail;Abraham, Roberto;Bolatto, Alberto;Lenkić, Laura;Damjanov, Ivana
本文利用哈勃太空望远镜/WFC3对新组装质量天体动力学(DINDO)观测的六个星系的观测，结合SED的恒星群模拟，确定了DYNAMO团的恒星质量。迪纳摩样品已被证明具有类似于z≈1.5湍流、块状磁盘的特性。迪纳摩样本团质量为Z>；1的研究提供了一个有用的比较，因为这两个星系具有相同的属性，但观测偏差却显著不同。使用迪纳摩，我们可以更容易地探测静止框架的近红外波长，也可以探测更精细的空间尺度。我们发现，迪纳摩团的恒星质量通常为107M108M−⊙。我们采用了一种技术，在从附近的光团中去除光时进行非参数校正，并执行局部确定的圆盘减影。视盘减影的过程是主要的效果，可以在0.3度水平上改变团块质量。利用这些质量，我们研究了迪纳摩星系中团块的恒星质量函数。发电机恒星的MF与斜率α≈−为1.4时遵循幂下降规律，比在Z>；1透镜星系中观察到的略浅，但相似。我们将发电机的块状质量与模拟结果进行比较。迪纳摩星系中团块的质量和银心位置与模拟中的长寿命团块更相似。类似于最近迪纳摩关于恒星种群梯度的结果，这些结果与没有使用强烈的早期辐射反馈处方的模拟是一致的。
In this paper, we useHubble Space Telescope/WFC3 observations of six galaxies from the DYnamics of Newly Assembled Massive Object (DYNAMO) survey, combined with stellar population modelling of the SED, to determine the stellar masses of DYNAMO clumps. The DYNAMO sample has been shown to have properties similar toz≈ 1.5 turbulent, clumpy discs. DYNAMO sample clump masses offer a useful comparison for studies ofz> 1 in that the galaxies have the same properties, yet the observational biases are significantly different. Using DYNAMO, we can more easily probe rest-frame near-IR wavelengths and also probe finer spatial scales. We find that the stellar mass of DYNAMO clumps is typically 107−108M⊙. We employ a technique that makes non-parametric corrections in removal of light from nearby clumps, and carries out a locally determined disc subtraction. The process of disc subtraction is the dominant effect, and can alter clump masses at the 0.3 dex level. Using these masses, we investigate the stellar mass function (MF) of clumps in DYNAMO galaxies. DYNAMO stellar MFs follow a declining power law with slopeα≈ −1.4, which is slightly shallower than, but similar to what is observed inz> 1 lensed galaxies. We compare DYNAMO clump masses to results of simulations. The masses and galactocentric position of clumps in DYNAMO galaxies are more similar to long-lived clumps in simulations. Similar to recent DYNAMO results on the stellar population gradients, these results are consistent with simulations that do not employ strong ‘early’ radiative feedback prescriptions.