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arXiv 1807.07575astro-ph.GA
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本机宇宙中星系周围冷气体流入和流出的普遍性和性质

The prevalence and properties of cold gas inflows and outflows around galaxies in the local Universe

G. W. Roberts-Borsani, A. Saintonge

摘要:

利用SDSS DR 7光谱数据集对中性\nad \、$λλ$ 5889、5895\、PDMATHABISM双峰进行了叠加分析,以探测SFR-M $_{*}$面上局部(0. 025 $\leqslant z\leqslant$ 0. 1)不活跃星系和活动星系核宿主星系中冷(T\,$\lesssim$\,10 $^{4}$ \,K)星系尺度气流的普遍性和特征。我们发现低速外流是普遍存在于高SFR和恒星质量(10 $\lesssim$ log M $_{*}$ /M $_{\odot}$ $\lesssim$ 11.5)的地区,但我们没有发现任何检测在低质量(log M $_{*}$ /M $_{\odot}$ $\lesssim$ 10)制度。我们还发现在恒星形成的人口中,在高质量星系中流入气体的试探性探测。我们得到的质量流出率在0.14- 1.74\,M $_{\odot}$ yr $^{-1}$的范围内,流入率的上限<1\,M $_{\odot}$ yr $^{-1}$,允许我们对质量加载因子($η$ = $\dot{M}_{\text{out}}$ /SFR)进行约束,用于模拟局部宇宙。我们讨论的流出的命运,通过比较的力量所提供的星爆的临界力需要推动外流向外,并发现绝大多数的外流不太可能逃脱主机系统。最后,流出检测率和中心速度不强烈变化的存在下,一个(弱)活动的超大质量黑洞,我们确定恒星形成似乎是主要的驱动程序流出$z\sim$ 0。

英文摘要:

We perform a stacking analysis of the neutral \nad\,$λλ$5889,5895\,Å ISM doublet using the SDSS DR7 spectroscopic data set to probe the prevalence and characteristics of cold (T\,$\lesssim$\,10$^{4}$\,K) galactic-scale gas flows in local (0.025$\leqslant z\leqslant$0.1) inactive and AGN-host galaxies across the SFR-M$_{*}$ plane. We find low-velocity outflows to be prevalent in regions of high SFRs and stellar masses (10 $\lesssim$log M$_{*}$/M$_{\odot}$ $\lesssim$ 11.5), however we do not find any detections in the low mass (log M$_{*}$/M$_{\odot}$ $\lesssim$ 10) regime. We also find tentative detections of inflowing gas in high mass galaxies across the star-forming population. We derive mass outflow rates in the range of 0.14-1.74\,M$_{\odot}$yr$^{-1}$ and upper limits on inflow rates <1\,M$_{\odot}$yr$^{-1}$, allowing us to place constraints on the mass loading factor ($η$=$\dot{M}_{\text{out}}$/SFR) for use in simulations of the local Universe. We discuss the fate of the outflows by comparing the force provided by the starburst to the critical force needed to push the outflow outward, and find the vast majority of the outflows unlikely to escape the host system. Finally, as outflow detection rates and central velocities do not vary strongly with the presence of a (weak) active supermassive black hole, we determine that star formation appears to be the primary driver of outflows at $z\sim$0.

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