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GLASS-JWST的早期结果. XX:揭示Abell2744及同期场中一类“红超”星系族群

Early results from GLASS-JWST. XX: Unveiling a population of "red-excess'' galaxies in Abell2744 and in the coeval field

Benedetta Vulcani, Tommaso Treu, Antonello Calabro, Jacopo Fritz, Bianca Poggianti, Pietro Bergamini, Andrea Bonchi, Kit Boyett, Gabriel Caminha, Marco Castella… 展开作者

Benedetta Vulcani, Tommaso Treu, Antonello Calabro, Jacopo Fritz, Bianca Poggianti, Pietro Bergamini, Andrea Bonchi, Kit Boyett, Gabriel Caminha, Marco Castellano, Alan Dressler, Adriano Fontana, Karl Glazebrook, Claudio Grillo, Matthew Malkan, Sara Mascia, Amata Mercurio, Emiliano Merlin, Benjamin Metha, Takahiro Morishita, Themiya Nanayakkara, Diego Paris, Guido Roberts-Borsani, Piero Rosati, Namrata Roy, Paola Santini, Michele Trenti, Eros Vanzella, Xin Wang

AI总结:

结合JWST/NIRCam和MUSE数据,研究Abell2744星系团及场区星系,发现了一类具有异常红F200W-F444W颜色但静止系偏蓝的“红超”星系族群,推测其由尘埃遮蔽的恒星形成导致,且环境机制可能起触发作用。

摘要:

我们结合JWST/NIRCam成像和MUSE数据,来刻画Abell2744星系团($z=0.3064$)及其紧邻周边区域中不同环境条件下的星系性质。我们研究了星系颜色、形态和恒星形成比例如何依赖于波长以及环境的不同参数化方式。我们最显著的结果是在星系团区域和场区中,均于F200W$-$F444W颜色上发现了一个“红超”族群。这些星系具有正常的F115W$-$F150W颜色,但在F200W$-$F444W中比红序星系红达0.8星等。它们还具有相当蓝的静止系B$-$V颜色。{场区和星系团位力半径处的星系总体上具有更红的颜色,但颜色偏差最大的星系出现在场区和星系团核心。多项结果}表明,发生在这些区域的机制可能更有效地产生了这些颜色。观察它们的形态,许多星系团星系表现出与冲压剥离相一致的特征,而场星系则具有类似相互作用和并合的特征。我们的假设是这些星系以尘埃笼罩的恒星形成为特征:其中一星系的JWST/NIRSpec光谱由3.3$μm$处的强PAH主导,暗示了尘埃遮蔽的恒星形成。需要更大的光谱样本以了解颜色超量是否完全归因于尘埃遮蔽的恒星形成,以及环境在触发该过程中的作用。

英文摘要:

We combine JWST/NIRCam imaging and MUSE data to characterize the properties of galaxies in different environmental conditions in the cluster Abell2744 ($z=0.3064$) and in its immediate surroundings. We investigate how galaxy colors, morphology and star forming fractions depend on wavelength and on different parameterizations of environment. Our most striking result is the discovery of a ``red-excess'' population in F200W$-$F444W colors both in the cluster regions and the field. These galaxies have normal F115W$-$F150W colors, but are up to 0.8 mag redder than red sequence galaxies in F200W$-$F444W. They also have rather blue rest frame B$-$V colors. {Galaxies in the field and at the cluster virial radius are overall characterized by redder colors, but galaxies with the largest color deviations are found in the field and in the cluster core. Several results} suggest that mechanisms taking place in these regions might be more effective in producing these colors. Looking at their morphology, many cluster galaxies show signatures consistent with ram pressure stripping, while field galaxies have features resembling interactions and mergers. Our hypothesis is that these galaxies are characterized by dust enshrouded star formation: a JWST/NIRSpec spectrum for one of the galaxies is dominated by a strong PAH at 3.3$μm$, suggestive of dust obscured star formation. Larger spectroscopic samples are needed to understand if the color excess is due exclusively to dust-obscured star formation, and the role of environment in triggering it.

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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