论文标题
附近星系中的气盘相关性：NGC 3184和NGC 7793的案例研究
Gas-dust correlations in nearby galaxies: a case study of NGC 3184 and NGC 7793
论文作者
论文摘要
在星系的星际介质中进行的气盘相互作用的研究对于理解其中发生的各种物理过程至关重要。对应于各种天体物理环境的不同位置的此类事件的比较提供了对恒星形成以及尘埃破坏条件和时间量表的更多见解。我们提出了两个星系研究的案例研究：NGC 3184和NGC 7793，它们分别是“大设计螺旋”和``絮凝螺旋''的典型例子。我们使用档案数据研究了每个星系（包括螺旋臂）的各个空间分辨位置的气盘相关性。此外，我们将中性气体隔离为宽（温暖）和狭窄（冷）速度成分，以检查与单个灰尘发射带的相关性。我们发现气体和灰尘之间存在正相关，总原子气体发射主要由其在两个星系中的温暖成分主导。我们还发现，与NGC 3184相比，NGC 7793中的灰尘种群来自冷，弥漫性，较大的灰尘颗粒的发射量更大。这项附近的Galaxy Pilot研究可以作为模板，用于对具有类似形态的较大星系样品的类似研究。
The study of gas-dust interactions occurring in the interstellar medium of a galaxy is essential for understanding various physical processes taking place within it. A comparison of such events at different locations corresponding to diverse astrophysical environments provides more insight into the star-formation as well as dust destruction conditions and time-scales. We present a case study for two galaxies: NGC 3184 and NGC 7793, which are typical examples of a `grand design spiral' and a `flocculent spiral', respectively. We investigate the gas-dust correlations at various spatially resolved locations within each galaxy, including spiral arms, using archival data. Moreover, we have segregated the neutral gas into wide (warm) and narrow (cold) velocity components to check the correlations with individual dust emission bands. We find a positive correlation between the gas and the dust, with the total atomic gas emission mainly dominated by its warm component in both the galaxies. We also find the dust population in NGC 7793 to have a greater fraction of emission coming from cold and diffuse, larger-sized dust particles as compared to NGC 3184. This nearby galaxy pilot study could serve as a template for similar studies of larger galaxy samples with analogous morphologies.
