MIGHTEE-H i : the H i size-mass relation over the last billion years
MIGHTEE-H i : the H i size-mass relation over the last billion years
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MIGHTEE-H i ：过去十亿年的 H i 尺寸与质量关系
DOI：
10.1093/mnras/stac693
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发表时间：
2022
影响因子：
4.8
通讯作者：
Rajohnson S
中科院分区：
文献类型：
--
作者：
Rajohnson S
我们提出了观察到的204个星系从MIGHTEE调查早期科学数据的Hisize质量关系。MeerKAT的高灵敏度使我们能够探测到Himass中超过4个数量级的星系，从矮星系到大质量螺旋星系，包括所有形态类型。这是第一次在一个盲目的同质数据集上探索这种关系，该数据集覆盖了以前未探索的红移范围0 <z< 0.084，即宇宙时间中大约10亿年的时间。样品遵循从以前的工作中得出的相同的紧密对数关系，在直径（$D_{\rm H\，\small {\rm I}}$）和质量（$M_{\rm H\，\small {\rm I}}$）之间。我们测量的斜率为0.501 ± 0.008，截距为，观察到的散射为0.057 dex。我们第一次量化了0.054 ± 0.003 dex（）的内禀散射，这为星系形成和演化的宇宙学模拟提供了一个约束。我们推导出作为星系类型的函数的关系，并发现它们的内在散射和斜率是一致的误差范围内。我们还计算了$D_{\rm H\，\small {\rm I}}{ \！-\！}M_{\rmH\，\small {\rmI}}$关系，没有发现任何红移演化的证据。这些结果表明，在十亿年的回顾时间内，星系盘的气体分布和平均表面质量密度没有发生显着的演变，表明缺乏对形态类型和红移的依赖。
We present the observed Hisize–mass relation of 204 galaxies from the MIGHTEE Survey Early Science data. The high sensitivity of MeerKAT allows us to detect galaxies spanning more than 4 orders of magnitude in Himass, ranging from dwarf galaxies to massive spirals, and including all morphological types. This is the first time the relation has been explored on a blind homogeneous data set that extends over a previously unexplored redshift range of 0 <z< 0.084, i.e. a period of around one billion years in cosmic time. The sample follows the same tight logarithmic relation derived from previous work, between the diameter ($D_{\rm H\, \small {\rm I}}$) and the mass ($M_{\rm H\, \small {\rm I}}$) of Hidiscs. We measure a slope of 0.501 ± 0.008, an intercept of, and an observed scatter of 0.057 dex. For the first time, we quantify the intrinsic scatter of 0.054 ± 0.003 dex (), which provides a constraint for cosmological simulations of galaxy formation and evolution. We derive the relation as a function of galaxy type and find that their intrinsic scatters and slopes are consistent within the errors. We also calculate the $D_{\rm H\, \small {\rm I}}{ \!-\! }M_{\rm H\, \small {\rm I}}$ relation for two redshift bins and do not find any evidence for evolution with redshift. These results suggest that over a period of one billion years in look-back time, galaxy discs have not undergone significant evolution in their gas distribution and mean surface mass density, indicating a lack of dependence on both morphological type and redshift.