We present an extensive analysis of the relationship between star formation rate surface density () and molecular gas surface density () at sub-kpc scale in the elliptical galaxy Centaurus A (also known as NGC 5128) at the distance 3.8 Mpc. ¹²CO ( = 2-1) data from Atacama Large Millimetre/Sub-Millimetre Array SV data with very high resolution (2.9′′, 0.84′′), as well as 24 μm data from the Spitzer Space Telescope, were used. This is one of the first studies of the SF law on Centaurus A at this very high spatial resolution. The results showed a breakdown in star formation law with a index relating and at 185 pc. A significant correlation exists between surface densities of molecular gas and SFR with very long depletion time (68 Gy). In addition we examined the spatially resolved relationship between velocity dispersion and star formation rate surface density for the outer disk of this galaxy and we found that the average velocity dispersion is equal to 11.78 km/s. The velocity dispersion of the molecular ISM for the outer disk is found to follow a power relation with the star formation rate surface density , where β is the slope from the ordinary least square fitting. The value of β is about and is the power law index of the star formation law.

中文翻译：

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ALMA观测到的椭圆半人马座A的kk尺度下的恒星形成定律

我们对椭圆星系Centaurus A（也称为NGC 5128）中距离3.8 Mpc的亚kpc规模的恒星形成率表面密度（）和分子气体表面密度（）之间的关系进行了广泛的分析。¹² CO（（2.9''，0.84''），以及24从阿塔卡马大型毫米/分毫米波天线阵SV数据= 2-1）与数据非常高的分辨率 μ从斯皮策太空望远镜的m个数据，分别使用。这是在如此高的空间分辨率下对半人马座A的SF法的最早研究之一。结果显示恒星形成定律的分解与指数有关，并在185件。分子气体的表面密度和SFR与非常长的耗尽时间（68 Gy）之间存在显着的相关性。此外，我们检查了该星系外盘的速度色散与恒星形成速率表面密度之间的空间分辨关系，发现平均速度色散等于11.78 km / s。发现外盘分子ISM的速度色散与恒星形成速率表面密度呈幂函数关系，其中β是距普通最小二乘拟合的斜率。β的值约为并且是恒星形成规律的幂律指数。