在z≈3处被光谱证实的静止星系的紧凑、凸起为主的结构

P. Lustig, V. Strazzullo, C. D’Eugenio, E. Daddi, M. Pannella, A. Renzini, A. Cimatti, R. Gobat, S. Jin, J. Mohr, M. Onodera
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引用次数: 9

摘要

我们研究了在$z\approx 3$的光谱确认的大质量静止星系的结构特性,其中一个是这样的源的第一个相当大的样本,由10个位于$2.4 < z < 3.2$的$10.8<\log(M_{\star}/M_{\odot})<11.3$星系在COSMOS场中组成,其红移和静止被HST光栅光谱证实。虽然受到对年轻恒星群体的微弱偏见的影响,但这个样本被认为在这个宇宙时间里,在很大程度上代表了大多数质量最大、因此本质上最稀有的静止源。我们依靠有针对性的HST/WFC3观测,并拟合ssamrsic剖面与$\approx 4000$埃帧的星系表面亮度分布。我们发现典型的高ssamrsic指数和轴比(中位数分别为$\approx 4.5$和$0.73$)表明,与之前的一些结果不一致,第一批大质量静止星系可能在很大程度上已经是膨胀主导的系统。我们测量了致密星系的大小,平均为$\approx 1.4$ kpc,位于$\log(M_{\star}/M_{\odot})\approx 11.2$,这与之前对静止星系的恒星质量-大小关系的最高质量的外推结果很好地一致,以及它的红移演化,从较低和类似红移的光度选择样本中得到的结果。这项工作证实了$z\approx 3$上致密、凸起为主、大质量、静止源的存在,提供了对其结构特性的首批统计估计之一,并进一步限制了第一批静止星系的早期形成和演化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Compact, bulge-dominated structures of spectroscopically confirmed quiescent galaxies at z ≈ 3
We study structural properties of spectroscopically confirmed massive quiescent galaxies at $z\approx 3$ with one of the first sizeable samples of such sources, made of ten $10.8<\log(M_{\star}/M_{\odot})<11.3$ galaxies at $2.4 < z < 3.2$ in the COSMOS field whose redshifts and quiescence are confirmed by HST grism spectroscopy. Although affected by a weak bias toward younger stellar populations, this sample is deemed to be largely representative of the majority of the most massive and thus intrinsically rarest quiescent sources at this cosmic time. We rely on targeted HST/WFC3 observations and fit S\'ersic profiles to the galaxy surface brightness distributions at $\approx 4000$ angstrom restframe. We find typically high S\'ersic indices and axis ratios (medians $\approx 4.5$ and $0.73$, respectively) suggesting that, at odds with some previous results, the first massive quiescent galaxies may largely be already bulge-dominated systems. We measure compact galaxy sizes with an average of $\approx 1.4$kpc at $\log(M_{\star}/M_{\odot})\approx 11.2$, in good agreement with the extrapolation at the highest masses of previous determinations of the stellar mass - size relation of quiescent galaxies, and of its redshift evolution, from photometrically selected samples at lower and similar redshifts. This work confirms the existence of a population of compact, bulge dominated, massive, quiescent sources at $z\approx 3$, providing one of the first statistical estimates of their structural properties, and further constraining the early formation and evolution of the first quiescent galaxies.
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