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arXiv 2301.02209astro-ph.GA
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JWST揭示的WHL0137-08和MACS0647 +70星系团中$0.3<z<6.0$星系团的空间分辨恒星星族:星系团如何在宇宙时间内增长和熄灭?

Spatially Resolved Stellar Populations of $0.3<z<6.0$ Galaxies in WHL0137-08 and MACS0647+70 Clusters as Revealed by JWST: How do Galaxies Grow and Quench Over Cosmic Time?

Abdurro'uf, Dan Coe, Intae Jung, Henry C. Ferguson, Gabriel Brammer, Kartheik G. Iyer, Larry D. Bradley, Pratika Dayal, Rogier A. Windhorst, Adi Zitrin, Ashish … 展开作者

Abdurro'uf, Dan Coe, Intae Jung, Henry C. Ferguson, Gabriel Brammer, Kartheik G. Iyer, Larry D. Bradley, Pratika Dayal, Rogier A. Windhorst, Adi Zitrin, Ashish Kumar Meena, Masamune Oguri, Jose M. Diego, Vasily Kokorev, Paola Dimauro, Angela Adamo, Christopher J. Conselice, Brian Welch, Eros Vanzella, Tiger Yu-Yang Hsiao, Xinfeng Xu, Namrata Roy, Celia R. Mulcahey

摘要:

我们研究了$0.3<z<6.0$上444个星系在两个星系团(WHL 0137 -08和MACS 0647 +70)和一个空白视场中的空间分辨恒星星族,结合HST和JWST的成像数据,使用pixedfit进行空间分辨光谱能量分布(SED)模拟。高空间分辨率的成像数据,加上星系团场中引力透镜的放大,使我们能够将一些星系分辨到亚千秒差距的尺度(我们的星系中有109个)。在宇宙中午附近的红移和更高($2.5\lesssim z\lesssim 6.0$),我们发现质量倍增时间是独立的半径,推断从平坦的比恒星形成率(sSFR)的径向轮廓和半质量和半SFR半径之间的相似性。在较低的红移($1.5\lesssim z\lesssim 2.5$),我们的恒星形成星系中有很大一部分显示出核星爆的证据,从中心升高的sSFR推断,与半质量半径相比,半SFR半径要小得多。在后来的时期,我们发现更多的星系抑制了中心的恒星形成,但仍然在盘中积极形成恒星。总的来说,这些趋势指向了一幅由内而外的星系生长的图景,与理论模型和模拟一致。利用$\sim 0.38$ dex散射,我们还观察到中心质量表面密度和全球恒星质量之间的紧密关系。我们的分析表明,空间分辨SED分析与JWST数据的潜力。未来对更大样本的分析将能够进一步探索星系质量的组装及其结构的生长

英文摘要:

We study the spatially resolved stellar populations of 444 galaxies at $0.3<z<6.0$ in two clusters (WHL0137-08 and MACS0647+70) and a blank field, combining imaging data from HST and JWST to perform spatially resolved spectral energy distribution (SED) modeling using pixedfit. The high spatial resolution of the imaging data combined with magnification from gravitational lensing in the cluster fields allows us to resolve some galaxies to sub-kpc scales (for 109 of our galaxies). At redshifts around cosmic noon and higher ($2.5\lesssim z\lesssim 6.0$), we find mass doubling times to be independent of radius, inferred from flat specific star formation rate (sSFR) radial profiles and similarities between the half-mass and half-SFR radii. At lower redshifts ($1.5\lesssim z\lesssim 2.5$), a significant fraction of our star-forming galaxies show evidence for nuclear starbursts, inferred from centrally elevated sSFR, and a much smaller half-SFR radius compared to the half-mass radius. At later epochs, we find more galaxies suppress star formation in their center but are still actively forming stars in the disk. Overall, these trends point toward a picture of inside-out galaxy growth consistent with theoretical models and simulations. We also observe a tight relationship between the central mass surface density and global stellar mass with $\sim 0.38$ dex scatter. Our analysis demonstrates the potential of spatially resolved SED analysis with JWST data. Future analysis with larger samples will be able to further explore the assembly of galaxy mass and the growth of their structures

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