A new technique to isolate kinematically anomalous gas in HI data cubes

A new technique to isolate kinematically anomalous gas in HI data cubes
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一种隔离 HI 数据立方体中运动学异常气体的新技术

DOI:
10.1093/mnras/stac3443
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发表时间:
2022
影响因子:
4.8
通讯作者:
Baker, A J
Baker, A J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Randriamiarinarivo, N;Elson, E C;Baker, A J

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对附近星系的Hiline观测经常揭示出偏离一般圆形流动的平面外和/或运动学异常气体的存在。在这项工作中,我们研究了运动学异常的Higas在星系中的依赖关系,从simbacosmological模拟的星系性质,如Himass分数,特定的星星形成率,和本地环境密度。为了识别运动学异常气体,我们使用一种简单而有效的分解方法将其从星系盘中定期旋转的气体中分离出来;这种方法非常适合应用于观测数据集,但已经在这里使用模拟进行了验证。我们发现,在固定的原子气体质量分数,异常气体分数的增加与特定的星星形成率。我们还发现,异常气体分数并没有显着依赖于星系的环境。我们的分解方法有可能产生有用的见解,从未来的Hisurveys。
Hiline observations of nearby galaxies often reveal the presence of extraplanar and/or kinematically anomalous gas that deviates from the general circular flow. In this work, we study the dependence of kinematically anomalous Higas in galaxies taken from thesimbacosmological simulation on galaxy properties such as Himass fraction, specific star formation rate, and local environmental density. To identify kinematically anomalous gas, we use a simple yet effective decomposition method to separate it from regularly rotating gas in the galactic disc; this method is well-suited for application to observational data sets but has been validated here using the simulation. We find that at fixed atomic gas mass fraction, the anomalous gas fraction increases with the specific star formation rate. We also find that the anomalous gas fraction does not have a significant dependence on a galaxy’s environment. Our decomposition method has the potential to yield useful insights from future Hisurveys.
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DOI: --
发表时间: 2014
期刊:
影响因子: --
作者:
R. Thompson
通讯作者: R. Thompson