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arXiv 1506.03462astro-ph.GA
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结构和恒星形成对邻近星系气体含量的影响

The Effect of Structure and Star Formation on the Gas Content of Nearby Galaxies

Toby Brown, Barbara Catinella, Luca Cortese, Virginia Kilborn, Martha P. Haynes, Riccardo Giovanelli

摘要:

我们重新审视主要的HI-恒星质量比(气体分数)的标度关系,利用HI光谱叠加技术来了解附近星系的结构和恒星形成性质的气体含量的依赖关系。这项工作使用了一个体积有限的、多波长的样本,样本中有大约25,000个星系,这些星系是根据斯隆数字巡天的恒星质量(10^9 M_sol < M_* < 10^11.5 M_sol)和红移(0.02 < z < 0.05)以及阿雷西博遗产快速ALFA巡天的HI数据选择的。我们bin根据多个参数的星系跨越完整的气体贫富制度,以解开不同的组件和过程中影响气体含量的主导地位。我们第一次证明了气体分数与恒星质量和恒星表面密度的标度关系主要是由特定恒星形成速率的潜在星系双峰性和综合Kennicutt-Schmidt定律的组合驱动的。最后,我们提出初步的证据表明,HI耗尽的时间尺度取决于星系的质量和结构,在固定的特定恒星形成率。

英文摘要:

We revisit the main HI-to-stellar mass ratio (gas fraction) scaling relations, taking advantage of the HI spectral stacking technique to understand the dependence of gas content on the structural and star formation properties of nearby galaxies. This work uses a volume-limited, multi-wavelength sample of ~25,000 galaxies, selected according to stellar mass (10^9 M_sol < M_* < 10^11.5 M_sol) and redshift (0.02 < z < 0.05) from the Sloan Digital Sky Survey, and with HI data from the Arecibo Legacy Fast ALFA survey. We bin according to multiple parameters of galaxies spanning the full gas-poor to -rich regime in order to disentangle the dominance of different components and processes in influencing gas content. For the first time, we show that the scaling relations of gas fraction with stellar mass and stellar surface density are primarily driven by a combination of the underlying galaxy bimodality in specific star formation rate and the integrated Kennicutt-Schmidt law. Finally, we produce tentative evidence that the timescales of HI depletion are dependent upon galaxy mass and structure, at fixed specific star formation rate.

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