arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2605.02493astro-ph.GA
收藏

宇宙正午大质量宁静星系的形态与恒星形成性质

Morphological and Star Formation Properties of Cosmic Noon Massive Quiescent Galaxies

Indian Institute of Science Education and Research Pune(印度科学教育研究所浦那分校);National Centre for Radio Astrophysics – Tata Institute of Fundamental Research(国家射电天体物理中心 - 塔塔基础研究院)

Vaidik Prasal, Yogesh Wadadekar, Pralay Biswas, Rashi Jain

AI总结:

本研究利用JWST、HST等数据,分析宇宙正午(z=2-3)Abell 2744天区14个大质量宁静星系的性质,发现其呈由内而外淬灭模式,形态或与AGN反馈及形态淬灭相关。

摘要:

我们利用来自UNCOVER Treasury项目和MegaScience巡天的深场JWST NIRCam宽波段与中波段成像数据,以及补充的存档HST数据,分析了Abell 2744天区中宇宙正午(2 < z < 3)大质量宁静星系的恒星形成与形态性质。通过BAGPIPES SED建模,我们筛选出14个独特的大质量宁静星系(恒星质量M* ≳ 10^10 M☉, specific恒星形成率sSFR < 0.2/t_age)。使用statmorph和pysersic开展的形态分析显示,多数星系为中间型或S0星系,其Sérsic指数的中位数n ~ 4,符合核球主导系统的特征;该数值在z ~ 1.5–4范围内保持恒定,表明大质量星系的形态至少自z ~ 4起就与其宁静态相关联。通过piXedfit进行的空间分辨SED建模表明,14个星系中的11个呈现正的径向sSFR梯度,为由内而外的淬灭提供了直接证据,平均而言,从R/Re = 0.5到4.5,sSFR增加了约2个数量级。形成时间(t50)轮廓证实,内部区域平均比外部区域早形成约0.5 Gyr,而淬灭时标轮廓显示,星系核的淬灭速度比外围更快。多数星系是致密的,平均半质量半径为Re = 1.95 ± 0.13 kpc。观测到的由内而外淬灭模式与AGN反馈驱动的淬灭一致,而核球主导的形态表明形态淬灭也可能有贡献。

英文摘要:

We analyze the star formation and morphological properties of massive quiescent galaxies at cosmic noon ($2 < z < 3$) in the Abell 2744 field, using deep JWST NIRCam broadband and medium-band imaging from the UNCOVER Treasury program and the MegaScience survey, complemented by archival HST data. Using BAGPIPES SED modeling, we select 14 unique massive quiescent galaxies ($M_* \gtrsim 10^{10}$ M$_\odot$, $\mathrm{sSFR} < 0.2/t_\mathrm{age}$). Morphological analysis with statmorph and pysersic reveals that most galaxies are intermediate type or S0s with a median Sérsic index $n \sim 4$, consistent with bulge-dominated systems. This value remains constant over $z \sim 1.5$--$4$, indicating that the morphology of massive galaxies is linked to their quiescence since at least $z \sim 4$. Spatially resolved SED modeling with piXedfit shows that 11 out of 14 galaxies exhibit positive radial sSFR gradients, providing direct evidence for inside-out quenching, with the mean sSFR increasing by $\sim2$ dex from $R/R_e = 0.5$ to $4.5$. Formation time ($t_{50}$) profiles confirm that inner regions formed $\approx 0.5$ Gyr earlier, on average, than the outer regions, and quenching timescale profiles show that the cores were quenched more rapidly than the outskirts. Most galaxies are compact, with a mean half-mass radius of $R_e = 1.95 \pm 0.13$ kpc. The observed inside-out quenching pattern is consistent with quenching driven by AGN feedback, while the bulge-dominated morphologies suggest morphological quenching may also contribute.

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。

↑