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arXiv 0803.0414astro-ph
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z=0 ~ z=0.7星系的恒星形成历史

Star formation history of galaxies from z=0 to z=0.7 A backward approach to the evolution of star-forming galaxies

V. Buat, S. Boissier, D. Burgarella, T. T. Takeuchi, E. Le Floc'h, D. Marcillac, J. Huang, M. Nagashima, M. Enoki

摘要:

我们研究了GOODS-S场中z=0 ~ z=0.7的恒星形成星系的平均恒星形成活动是否可以用这些系统的简单演化模型来再现。在这种情况下,这样的模型可能会被用来作为一阶参考的研究在较高的z破译时,以及在何种程度上的长期演变是足以解释恒星形成的历史星系。我们选择了z=0和z=0.7的红外和紫外恒星形成星系,以获得所有最近的恒星形成。我们关注的是恒星质量在10^{10}和10^{11} M_sun之间的星系,这些星系的结果不会受到选择的影响。我们将这些数据与为螺旋星系开发的化学演化模型进行了比较,这些模型最初是为了重现银河系和附近螺旋星系的主要特征而建立的,而没有对它们进行微调。我们发现,当恒星质量增加时,比恒星形成率(SSFR)有一个浅的下降。从z=0到z=0.7,SSFR的演化特征的紫外和红外选择的星系是一致的模型建立再现目前的旋涡星系。没有必要强烈修改星系的物理条件来解释它们的恒星形成从z=0到z=0.7的平均演化。我们使用的模型来预测恒星形成率的演变和更广泛的红移的金属丰度,我们比较这些预测与半解析模型的结果。

英文摘要:

We investigate whether the mean star formation activity of star-forming galaxies from z=0 to z=0.7 in the GOODS-S field can be reproduced by simple evolution models of these systems. In this case, such models might be used as first order references for studies at higher z to decipher when and to what extent a secular evolution is sufficient to explain the star formation history in galaxies. We selected star-forming galaxies at z=0 and at z=0.7 in IR and in UV to have access to all the recent star formation. We focused on galaxies with a stellar mass ranging between 10^{10} and 10^{11} M_sun for which the results are not biased by the selections. We compared the data to chemical evolution models developed for spiral galaxies and originally built to reproduce the main characteristics of the Milky Way and nearby spirals without fine-tuning them for the present analysis. We find a shallow decrease in the specific star formation rate (SSFR) when the stellar mass increases. The evolution of the SSFR characterizing both UV and IR selected galaxies from z=0 to z=0.7 is consistent with the models built to reproduce the present spiral galaxies. There is no need to strongly modify of the physical conditions in galaxies to explain the average evolution of their star formation from z=0 to z=0.7. We use the models to predict the evolution of the star formation rate and the metallicity on a wider range of redshift and we compare these predictions with the results of semi-analytical models.

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