JADES与CEERS河外巡天中的褐矮星候选体
Brown Dwarf Candidates in the JADES and CEERS Extragalactic Surveys
AI总结：
本研究结合JADES与CEERS的JWST/NIRCam数据，依据冷褐矮星大气分子吸收造成的双色特征筛选出21个T/Y型候选体，并通过模型拟合与自行观测论证其银河系起源。
摘要：
通过结合JWST/NIRCam的JADES和CEERS河外数据集，我们发现了一个包含21个T型和Y型褐矮星候选体的样本，其最佳拟合距离介于0.1–4.2 kpc之间。这些源是依据1 μm–2.5 μm的蓝色颜色和3 μm–4.5 μm的红色颜色筛选出来的，这些颜色源于有效温度T_eff < 1300 K的褐矮星大气中的分子吸收。我们使用多种低质量恒星大气模型拟合这些源，并给出该样本所得的流量、尺寸、有效温度及其他导出属性。若得到确认，这些拟合结果将把大多数源置于银河系厚盘和银晕中。我们在7个褐矮星候选体上观测到自行，其方向与银河系平面一致，为它们本质上并非河外天体提供了证据。我们展示了这些源的颜色如何不同于所选的高红移星系，并探讨了在计划中的大天区JWST NIRCam巡天里对这些源的筛选。利用JWST/NIRCam进行深度成像是发现和理解这些位于kpc距离处的极冷低质量恒星的绝佳机会。
英文摘要：
By combining the JWST/NIRCam JADES and CEERS extragalactic datasets, we have uncovered a sample of twenty-one T and Y brown dwarf candidates at best-fit distances between 0.1 - 4.2 kpc. These sources were selected by targeting the blue 1$μ$m - 2.5$μ$m colors and red 3$μ$m - 4.5$μ$m colors that arise from molecular absorption in the atmospheres of T$_{\mathrm{eff}} < $ 1300K brown dwarfs. We fit these sources using multiple models of low-mass stellar atmospheres and present the resulting fluxes, sizes, effective temperatures and other derived properties for the sample. If confirmed, these fits place the majority of the sources in the Milky Way thick disk and halo. We observe proper motion for seven of the candidate brown dwarfs with directions in agreement with the plane of our galaxy, providing evidence that they are not extragalactic in nature. We demonstrate how the colors of these sources differ from selected high-redshift galaxies, and explore the selection of these sources in planned large-area JWST NIRCam surveys. Deep imaging with JWST/NIRCam presents an an excellent opportunity for finding and understanding these very cold low-mass stars at kpc distances.
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。
