Highly turbulent gas on GMC scales in NGC 3256, the nearest luminous infrared galaxy

Highly turbulent gas on GMC scales in NGC 3256, the nearest luminous infrared galaxy
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NGC 3256 中 GMC 尺度上的高度湍流气体,NGC 3256 是光度最近的红外星系

DOI:
10.1093/mnras/staa3425
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发表时间:
2020
影响因子:
4.8
通讯作者:
A. Peck
A. Peck
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
N. Brunetti;C. Wilson;K. Śliwa;E. Schinnerer;S. Aalto;A. Peck

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我们提出了迄今为止获得的NGC 3256的最高分辨率CO(2-1)观测(0.25”),并使用它们来确定该合并中心6 kpc的分子星际介质的详细性质。物理量的分布报告从像素的像素测量在55和120 pc的规模,并比较观察到的盘星系PHANGS ALMA。质量表面密度范围从8到5500 M$_{\odot}$ pc$^{-2}$和速度分散从10到200 km s$^{-1}$。测量到的最高亮度温度高达37 K,表明NGC 3256中的气体可能比PHANGS-ALMA测量的附近盘星系中的所有区域都要热。在相同尺度下,亮温甚至超过了NGC 4038/9重叠区的亮温。大多数气体似乎是未结合的,中值维里参数为7至19,尽管外部压力可能会结合一些气体。发现了10$^{5}$到10$^{10}$ K cm$^{-3}$的高内部湍流压力。由于表面密度、亮温和速度色散与物理尺度之间缺乏显著的趋势,我们认为分子气体是由一种光滑的介质组成的,其尺度可达55 pc,而不像在PHANGS-ALMA盘星系中发现的更有结构的介质。
We present the highest resolution CO (2-1) observations obtained to date (0.25") of NGC 3256 and use them to determine the detailed properties of the molecular interstellar medium in the central 6 kpc of this merger. Distributions of physical quantities are reported from pixel-by-pixel measurements at 55 and 120 pc scales and compared to disc galaxies observed by PHANGS-ALMA. Mass surface densities range from 8 to 5500 M$_{\odot}$ pc$^{-2}$ and velocity dispersions from 10 to 200 km s$^{-1}$. Peak brightness temperatures as large as 37 K are measured, indicating the gas in NGC 3256 may be hotter than all regions in nearby disc galaxies measured by PHANGS-ALMA. Brightness temperatures even surpass those in the overlap region of NGC 4038/9 at the same scales. The majority of the gas appears unbound with median virial parameters of 7 to 19, although external pressure may bind some of the gas. High internal turbulent pressures of 10$^{5}$ to 10$^{10}$ K cm$^{-3}$ are found. Given the lack of significant trends in surface density, brightness temperature, and velocity dispersion with physical scale we argue the molecular gas is made up of a smooth medium down to 55 pc scales, unlike the more structured medium found in the PHANGS-ALMA disc galaxies.
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