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arXiv 1606.04823astro-ph.GA
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恒星形成历史对 z≥2 处 SFR-M$_{*}$ 关系的影响

The impact of the Star Formation Histories on the SFR-M$_{*}$ relation at z$\ge$2

L. P. Cassarà, D. Maccagni, B. Garilli, M. Scodeggio, R. Thomas, O. Le Fèvre, G. Zamorani, D. Schaerer, B. C. Lemaux, P. Cassata, V. Le Brun, L. Pentericci, L. … 展开作者

L. P. Cassarà, D. Maccagni, B. Garilli, M. Scodeggio, R. Thomas, O. Le Fèvre, G. Zamorani, D. Schaerer, B. C. Lemaux, P. Cassata, V. Le Brun, L. Pentericci, L. A. M. Tasca, E. Vanzella, E. Zucca, R. Amorín, S. Bardelli, M. Castellano, A. Cimatti, O. Cucciati, A. Durkalec, A. Fontana, M. Giavalisco, A. Grazian, N. P. Hathi, O. Ilbert, S. Paltani, B. Ribeiro, V. Sommariva, M. Talia, L. Tresse, D. Vergani, P. Capak, S. Charlot, T. Contini, S. de la Torre, J. Dunlop, S. Fotopoulou, L. Guaita, A. Koekemoer, C. López-Sanjuan, Y. Mellier, J. Pforr, M. Salvato, N. Scoville, Y. Taniguchi, P. W. Wang

AI总结:

本文利用 VUDS 中 z>2 星系样本,通过构建 28 种恒星形成历史模型并进行 SED 拟合,发现 SFR-M$_{*}$ 关系的弥散主要源于恒星形成历史族的选择,而非红移范围。

摘要:

本文利用来自 VIMOS 超深巡天(VUDS)中具有可靠光谱红移 zspec>2 的星系样本,研究了不同恒星形成历史(SFHs)对恒星质量 M$_{*}$ 与恒星形成率(SFR)之间关系的影响。我们基于 Cassara' 等人 2013 年提出的新单星族(SSPs)模型库,并以一组 28 种不同的、基于 Schmidt 函数且由气体下落时标 $τ_{infall}$ 与恒星形成效率 $ν$ 的不同比值所刻画的恒星形成历史进行加权,构建了一个包含尘埃模型星系的广泛数据库。尘埃消光与再辐射的处理通过辐射转移计算完成。光谱能量分布(SED)拟合技术使用 GOSSIP+ 工具进行,该工具能够结合测光与光谱信息来提取所关注物理量的最佳值,并将星系际介质(IGM)衰减作为自由参数处理。我们发现,在 $SFR-M_{*}$ 平面上观测到的弥散主要来源于 SED 拟合过程中可以在不同恒星形成历史族之间进行选择,而红移范围只起次要作用。在所有宇宙时期,大多数星系的最佳拟合模型都具有较高的 $τ_{\ m infall}/ν$ 比值。鉴于这些星系在远红外(FIR)波段被探测到的情况,我们讨论了存在一小部分富含尘埃且恒星形成活动剧烈的星系的可靠性。

英文摘要:

In this paper we investigate the impact of different star formation histories (SFHs) on the relation between stellar mass M$_{*}$ and star formation rate (SFR) using a sample of galaxies with reliable spectroscopic redshift zspec>2 drawn from the VIMOS Ultra-Deep Survey (VUDS). We produce an extensive database of dusty model galaxies, calculated starting from the new library of single stellar population (SSPs) models presented in Cassara' et al. 2013 and weighted by a set of 28 different SFHs based on the Schmidt function, and characterized by different ratios of the gas infall time scale $τ_{infall}$ to the star formation efficiency $ν$. The treatment of dust extinction and re-emission has been carried out by means of the radiative transfer calculation. The spectral energy distribution (SED) fitting technique is performed by using GOSSIP+, a tool able to combine both photometric and spectroscopic information to extract the best value of the physical quantities of interest, and to consider the Intergalactic Medium (IGM) attenuation as a free parameter. We find that the main contribution to the scatter observed in the $SFR-M_{*}$ plane is the possibility of choosing between different families of SFHs in the SED fitting procedure, while the redshift range plays a minor role. The majority of the galaxies, at all cosmic times, are best-fit by models with SFHs characterized by a high $τ_{\rm infall}/ν$ ratio. We discuss the reliability of the presence of a small percentage of dusty and highly star forming galaxies, in the light of their detection in the FIR.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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