论文标题
螺旋星系NGC 7331中气体，灰尘和年轻恒星种群的相关性
Correlations of gas, dust and young stellar populations in the spiral galaxy NGC 7331
论文作者
论文摘要
星系中的分子云（MC）是具有许多相的复杂位置。因此，使用多个发射线研究MC的物理和运动学是必不可少的。我们使用多个发射线，即一氧化碳（CO），24μm和Far-plytraviolet（FUV）数据探测附近螺旋星系NGC 7331中分子气和粉尘的物理。在NGC 7331的气态盘上瞄准了14个位置。我们发现CO强度，气体质量，气体表面密度和24μm与粉丝通量比（即灭绝）从中心增加了约40 Arcsec，然后开始降低。所研究的大多数参数之间存在正相关（FUV通量密度除外）。椎间盘东侧的横梁平均物理参数显示出比西侧的物理参数更高的中值值。我们的结果表明，ISM的恒星形成活性，恒星种群和盘的整体物理特性在光盘的两侧都是不同的。我们的研究为星系中星际介质（ISM）的复杂性提供了明显的见解，并有可能引发未来的高分辨率研究。
Molecular clouds (MCs) in galaxies are complex places with many phases. It is, therefore, essential to study the physics and kinematics of the MCs using multiple emission lines. We probe the physics of the molecular gas and dust in the nearby spiral galaxy NGC 7331 using multiple emission lines, i.e. carbon monoxide (CO), 24μm and far-ultraviolet (FUV) data. 14 positions were targeted across the gaseous disc of NGC 7331. We found that CO intensities, gas mass, gas surface density, and 24μm-to-FUV flux ratio (i.e. the extinction) increase up to about 40 arcsec from the centre and then start to decrease. There is a positive correlation between most of the pair of parameters studied (except FUV flux density). The beam-averaged physical parameters on the eastern side of the disc show higher median values than those on the western side. Our results indicate that the star formation activity, stellar populations and overall physical properties of the ISM are different on either side of the disc. Our study provides notable insights into the complex nature of the interstellar medium (ISM) in galaxies and has the potential to provoke future higher-resolution studies yet to come.
