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arXiv 1401.7675astro-ph.COastro-ph.GA
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包含超新星反馈的高红移星系中的恒星形成:对恒星质量和光度函数的影响

Star formation in high redshift galaxies including Supernova feedback: effect on stellar mass and luminosity functions

Saumyadip Samui

摘要:

我们提出了一个高红移星系形成的半解析模型。在我们的模型中,星系内部的恒星形成是由超新星(SNe)驱动的外流反馈调节的。考虑到SNe反馈的自洽性,我们导出了单个星系中恒星形成率的封闭解析形式。结果表明,我们的模型可以解释观测到的从矮星系到大质量星系$10^{12} M_\odot$的恒星质量与星系圆速度之间的相关性。对于小质量的矮星系,除了超新星反馈之外,还需要额外的反馈来解释观测数据的传播。我们的模型再现所观察到的3-D基本的恒星质量,气相金属丰度和恒星形成率在星系建立SNe反馈在建立这种关系中起着重要作用之间的相关性。此外,观测到的Lyman-Break星系(LBG)的紫外光度函数很好地解释了我们的反馈诱导恒星形成模型的一个巨大的红移范围的$1.5 \le z \le 8$。特别是,平坦的光度函数在低光度端自然出现,由于我们明确的SNe反馈处理。

英文摘要:

We present a semi-analytical model of high redshift galaxy formation. In our model the star formation inside a galaxy is regulated by the feedback from supernova (SNe) driven outflows. We derive a closed analytical form for star formation rate in a single galaxy taking account of the SNe feedback in a self-consistent manner. We show that our model can explain the observed correlation between the stellar mass and the circular velocity of galaxies from dwarf galaxies to massive galaxies of $10^{12} M_\odot$. For small mass dwarf galaxies additional feedback other than supernova feedback is needed to explain the spread in the observational data. Our models reproduce the observed 3-D fundamental correlation between the stellar mass, gas phase metallicity and star formation rate in galaxies establishing that the SNe feedback plays a major role in building this relation. Further, the observed UV luminosity functions of Lyman-Break galaxies (LBGs) are well explained by our feedback induced star formation model for a vast redshift range of $1.5 \le z \le 8$. In particular, the flattening of the luminosity functions at the low luminosity end naturally arises due to our explicit SNe feedback treatment.

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