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arXiv 2501.04788astro-ph.GAastro-ph.CO
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利用 JWST/PRIMER 研究 0.5<z<3 年轻与年老宁静星系的半质量半径和颜色梯度演化

The Evolution of Half-Mass Radii and Color Gradients for Young and Old Quiescent Galaxies at $0.5 < z < 3$ with JWST/PRIMER

Maike Clausen, Ivelina Momcheva, Katherine E. Whitaker, Sam E. Cutler, Rachel S. Bezanson, James S. Dunlop, Norman A. Grogin, Anton M. Koekemoer, Derek McLeod, … 展开作者

Maike Clausen, Ivelina Momcheva, Katherine E. Whitaker, Sam E. Cutler, Rachel S. Bezanson, James S. Dunlop, Norman A. Grogin, Anton M. Koekemoer, Derek McLeod, Ross McLure, Tim B. Miller, Erica Nelson, Arjen van der Wel, David Wake, Stijn Wuyts

AI总结:

本文基于 JWST/PRIMER 多波段成像比较 455 个宁静星系的半光与半质量半径,发现中等质量年轻与年老星系尺寸一致,尺寸增长源于前身星偏差和次并合。

摘要:

我们提出了一项关于 0.5<z<3 红序尺寸增长的研究,利用 PRIMER 巡天提供的多波段 JWST/NIRCam 成像,追踪宁静星系在有效半光半径和半质量半径两方面的演化。对于 455 个 log(M_*/M_☉)>10 的宁静星系,我们使用 6 个不同滤光片的成像测量半光半径;半质量半径则由 F444W 轮廓结合 F277W-F444W 颜色–M_*/L 关系导出。我们研究了 r_e,mass/r_e,light 比值对红移、恒星质量以及用于测量 r_e,light 的波长的依赖,并将样本进一步分为较年轻和较年老的宁静星系。数据表明,静止系红外尺寸能够准确追踪质量加权尺寸,而在静止系光学波长(0.5–0.7 μm)测得的尺寸大 0.1–0.2 dex,且随红移仅有较小变化。我们发现,在中等质量 10<log(M_*/M_☉)<11 范围内,年轻宁静星系的平均尺寸与年老宁静星系相符;在所有观测系半光半径、静止系半光半径和半质量半径测量中,二者均在各自不确定度内一致。从表面上看,我们的结果表明,前身星偏差与次并合的共同作用驱动了 0.5<z<3 中等质量宁静星系的尺寸增长。结果还表明,年轻与年老宁静星系对整体宁静星系种群贡献的变化,可能产生类似红移演化的假象。

英文摘要:

We present a study of the size growth of the red sequence between $0.5<z<3,$ tracing the evolution of quiescent galaxies in both effective half-light and half-mass radii using multi-wavelength JWST/NIRCam imaging provided by the PRIMER survey. Half-light radii are measured from imaging in 6 different filters for 455 quiescent galaxies with log($M_*/M_{\odot}$)$>10$, whereas half-mass radii are derived from the F444W profiles together with the F277W-F444W color-$M_*$/L relation. We investigate the dependence of the ratio $r_{e, \mathrm{mass}}/r_{e, \mathrm{light}}$ on redshift, stellar mass, and the wavelength used to measure $r_{e, \mathrm{light}}$, also separating the sample into younger and older quiescent galaxies. Our data demonstrate that rest-frame infrared sizes accurately trace mass-weighted sizes while sizes measured at rest-frame optical wavelengths (0.5-0.7$μ$m) are 0.1-0.2 dex larger, with only minor variations in redshift. We find that the average size of young quiescent galaxies agrees with that of old quiescent galaxies at intermediate masses, $10<$log($M_*/M_{\odot}$)$<11$, within their respective uncertainties in all observed-frame half-light, rest-frame half-light and half-mass radius measurements. At face value, our results point to a combination of progenitor bias and minor mergers driving the size growth of intermediate-mass quiescent galaxies at $0.5<z<3$. Our results further indicate that the varying contributions to the general quiescent population by young and old quiescent galaxies can mimic evolution in redshift.

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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