论文标题
Glass-JWST的早期结果。十三。淡淡，遥远和冷的棕色矮人
Early results from GLASS-JWST. XIII. A faint, distant, and cold brown dwarf
论文作者
论文摘要
我们介绍了在JWST Nircam观察到的早期发行科学Abell 2744 Parallel Field的JWST Nircam观察中的T型棕色矮人候选者的偶然发现。 JWST在4〜 $ m $ m波长和光谱0.9--4.5〜 $μ$ m的光谱分布覆盖范围中的灵敏度启用了这一发现。未解决的点源具有幅度F115W = 27.95 $ \ pm $ 0.15和F444W = 25.84 $ \ pm $ 0.01（AB），其F115W $ - $ -F444W和F356W $ -F444W $ - $ -F444W颜色与其他众所周知的T dwarfs相匹配。我们可以将其排除在红色的背景恒星，高红移类星体或非常高的红移星系中。与恒星大气模型的比较表明，温度为$ t_ {eff} $ $ \ $ 600〜k，表面重力$ \ log {g} $ $ \ $ 5 $ 5，这意味着质量为0.03〜m $ _ {\ odot} $且年龄为5〜gyr。我们估计，该候选者的距离为570--720〜PC，沿垂直于银河平面的方向，使其成为可能厚的磁盘或Halo Brown Dwarf。这些观察结果强调了JWST在银河厚盘和光环中探测近质量质量函数非常低的质量端的力量。
We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4~$μ$m wavelengths and the panchromatic 0.9--4.5~$μ$m coverage of the spectral energy distribution. The unresolved point source has magnitudes F115W = 27.95$\pm$0.15 and F444W = 25.84$\pm$0.01 (AB), and its F115W$-$F444W and F356W$-$F444W colors match those expected for other, known T dwarfs. We can exclude it as a reddened background star, high redshift quasar, or very high redshift galaxy. Comparison with stellar atmospheric models indicates a temperature of $T_{eff}$ $\approx$ 600~K and surface gravity $\log{g}$ $\approx$ 5, implying a mass of 0.03~M$_{\odot}$ and age of 5~Gyr. We estimate the distance of this candidate to be 570--720~pc in a direction perpendicular to the Galactic plane, making it a likely thick disk or halo brown dwarf. These observations underscore the power of JWST to probe the very low-mass end of the substellar mass function in the Galactic thick disk and halo.
