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arXiv 1902.07712astro-ph.GA
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用空间分辨SED拟合揭示过去10 Gyr大质量盘星系中空间分辨恒星质量积累和猝灭

Spatially resolved stellar mass buildup and quenching in massive disk galaxies over the last 10 Gyr revealed with spatially resolved SED fitting

Abdurro'uf, Masayuki Akiyama

摘要:

尽管在过去的10 Gyr宇宙恒星形成率密度下降,但星系中的恒星质量($M_{*}$)在这一时期仍在增加。目前宇宙中大约50%的$M_{*}$密度是建立在最后一个$\sim 8.7$ Gyr之上的。在这项研究中,我们调查了过去10 Gyr的大质量盘星系内空间分辨区域的恒星质量积累和淬火。本文将光谱能量分布拟合方法应用于星系亚银道区的光谱能量分布,得到了SFR和$M_{*}$在星系中的空间分辨分布。将这种方法即\textit{pixel-to-pixel SED fitting}方法应用于大质量盘星系的$0.01<z<0.02$和$0.8<z<1.8$。我们发现,大质量盘星系倾向于建立自己的$M_{*}$和淬火的恒星形成逐渐从中心区域到外围,即\textit{inside-out}恒星质量积累和淬火。

英文摘要:

Despite decreasing cosmic star formation rate density over the last 10 Gyr, the stellar mass ($M_{*}$) buildups in galaxies were still progressing during this epoch. About 50\% of the current $M_{*}$ density in the universe was built over the last $\sim 8.7$ Gyr. In this research, we investigated the stellar mass buildup and quenching of spatially resolved regions within massive disk galaxies over the last 10 Gyr. We apply the spectral energy distribution (SED) fitting method to SEDs of sub-galactic regions in galaxies to derive the spatially resolved distributions of SFR and $M_{*}$ in the galaxies. This namely \textit{pixel-to-pixel SED fitting} method is applied to massive disk galaxies at $0.01<z<0.02$ and $0.8<z<1.8$. We found that massive disk galaxies tend to build their $M_{*}$ and quench their star formation progressively from the central region to the outskirts, i.e. \textit{inside-out} stellar mass buildup and quenching.

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